Faculty Profiles - NAKAMURA Takao

MISC - NAKAMURA Takao

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Electrical impedance myographyに用いるハンドヘルド型電極アレイの作製骨格筋インピーダンスの測定精度向上を目的とした検証

佐藤宏樹, 楠原俊昌, 中村隆夫

電子情報通信学会技術研究報告(MEとバイオサイバネティックス) 121 ( 132 ) 1 - 4 2021.7

Study of the skin electrical impedance model for assessment of the skin barrier function

上原治, 楠原俊昌, 舟木勇矢, 中村隆夫

日本生体医工学会大会プログラム・抄録集(Web) 60th 522 - 522 2021

Authorship：Last author Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p>A decline in the skin barrier function makes it easier for various chemicals to enter the body and causes allergies and other problems. We think it is very useful to quantitatively assess the skin barrier function in various fields including dermatology, nursing science and the cosmetics development. In this study we proposed the electrical equivalent model regarded the stratum corneum as the parallel circuit of the resistor and the capacitor, and we studied whether the transepidermal water loss (TEWL) could be estimated from the measurement results of skin electrical impedance. As a result of estimating TEWL with the measurement result of skin electrical impedance we could obtain a high correlation with the measured TEWL. This model may be possible to assess the skin barrier function of the patients with atopic dermatitis and patients with a stoma and to obtain new evidence for diseases such as atopic dermatitis. </p>

DOI： 10.11239/jsmbe.Annual59.522

Preparation of a hand-held electrode array for electrical impedance myography

佐藤宏樹, 楠原俊昌, 神野俊克, 花山耕三, 中村隆夫

日本生体医工学会大会プログラム・抄録集(Web) 60th 437 - 437 2021

Authorship：Last author Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p>In this experiment, a handheld electrode with an arc-shaped electrode mounting surface was fabricated using a plastic splint material (Easyform, Sakai Medical, Japan). A tape electrode (Ag-AgCl, 10 mm 80 mm) was attached to the electrode mounting surface, which was 80 mm length (circular arc of R 66 mm) 130 mm width, in a four-electrode configuration. Impedance measurements were performed using SFB7 (ImpediMed, Australia). Impedance measurements were performed on the rectus femoris and vastus lateralis muscles of five adult males. Impedance parameter were calculated by arc optimization using the Cole-Cole model using 172 points of Resistance and Reactance with frequencies ranging from 10 kHz to 300 kHz. Their reproducibility was analyzed using the intra-class correlation coefficient and the Bland-Altman analysis was used to analyze the error. The results showed that the ICC(1, 1) of each muscle was greater than 0.9 and no systematic error of each parameter occurred. </p>

DOI： 10.11239/jsmbe.Annual59.437

Relationship between electrodes and current reach distance in EMI using bioequivalent phantom

佐藤宏樹, 中村隆夫, 楠原俊昌, 花山耕三

日本生体医工学会大会プログラム・抄録集(Web) 59th 399 - 399 2020

Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p>In this experiment, two agar phantoms (70 mm 180 mm) with electrical conductivity of 6.61 m/s (muscle) and 0.99 m/s (fat) were used to construct a two-layered model (10 mm fat layer) assuming biological tissues. As the distance D between the current electrodes (40-100 mm, 4 conditions), the potential electrodes were placed at the inner 10 mm of the current electrode. Z was measured under six conditions in which the phantom thickness x was varied from 10 mm to 60 mm at 10 mm intervals. Z for x at the distance D between the electrodes was approximated as the sum of the exponential functions and constants. X, where the estimated value of Z is 105% of this constant value, was defined as the distance to reach the current, L. As a result of this experiment, L showed a linear correlation with D.</p>

DOI： 10.11239/jsmbe.Annual58.399

Damping pattern of lower-leg supporting force released at the beginning of pendulum-test

楠原俊昌, 中村隆夫, 道西博行, 軸屋和明

日本生体医工学会大会プログラム・抄録集(Web) 59th 396 - 396 2020

Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p> In knee-joint angular acceleration waveforms measured for pendulum-test of seated subject, some measurement errors may be caused by lower-leg supporting force remained after its start (residual force). Authors had corrected them temporally by approximating its damping pattern with a straight line. In this panel, we derived a better damping pattern from residual force measured on the way of the pendulum test. The residual forces in each of two normal subjects were measured 5 times under 3 initial knee-joint angles by a load sensor attached to palm for the lower-leg supporting. Normalization of measured damping patterns showed that it could be approximated by a quadratic function -a₁ t²-a₂ t+1, where a₁, a₂ were constants, the values of which might differ every measurement. Building such quadratic function in the inverse simulator for estimating spasticity, it is expected to be able to correct the influence of the residual force.</p>

DOI： 10.11239/jsmbe.Annual58.396

Influence of thigh fluctuation upon pendulum-test waveforms

道西博行, 楠原俊昌, 中村隆夫, 岡本卓爾

日本生体医工学会大会プログラム・抄録集(Web) 59th 395 - 395 2020

Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p>Although pendulum-test is a simple and objective method to estimate spasticity by the use of the waveform of knee-joint pendulum motion, it isn't easy to unify lower-leg support situation at the beginning of its measurement without heavy burden on the subject. Large amount of fluctuation therefore exists in initial part of most waveform. We measured knee-joint angular velocity waveforms under the initial hip-joint positions of different angle as the first step to clarify its behavior. In each case, a damped oscillation was observed which constructed by 2~3 saw-tooth like spikes, and the higher the angle of the initial position was, the larger its amplitude became. Inverse simulation of the measured waveform showed that, the larger the initial angle of the hip-joint was, the larger the residual became. Present problem is to develop some way to be able to remove such an influence, reserving the present lower-leg support situation. </p>

DOI： 10.11239/jsmbe.Annual58.395

Study of the skin electric impedance model applied the water content of stratum corneum

上原治, 中村隆夫, 楠原俊昌, 松崎健一, 山本尚武

日本生体医工学会大会プログラム・抄録集(Web) 59th 400 - 400 2020

Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p>The deterioration of skin barrier function causes symptoms such as allergy as various chemical substances may enter human body. We think it is very useful to quantitatively evaluate the stratum corneum thickness and the water content of stratum corneum as the skin barrier function in domains such as dermatology, nursing science and the cosmetics development. We studied the new model regarded as the parallel model of the resistor and the capacitor applied the stratum corneum thickness of the skin stripped model measured the confocal laser scanning microscopy and the water content of stratum corneum of the skin stripped model measured the confocal raman microscopy. We found the stratum corneum thickness with the impedance has strong correlation with the stratum corneum thickness with the confocal laser scanning microscopy, and the water content of stratum corneum with the impedance has strong correlation with the stratum corneum thickness with the confocal raman microscopy.</p>

DOI： 10.11239/jsmbe.Annual58.400

Correction of unstable lower-leg supporting force on pendulum-test by quadric curve approximation

中村隆夫, 楠原俊昌, 道西博行, 山本尚武

日本生体医工学会大会プログラム・抄録集(Web) 59th 397 - 397 2020

Authorship：Lead author,　Corresponding author Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p>In pendulum-test of seated subjects, measured waveforms had frequently included much distortion due to the lower-leg supporting force remained after its release. The authors had tried to correct it by approximating the damping pattern of the force with a linear one. In this study, we used a more accurate damping pattern of quadratic curve in place of the linear pattern. The former pattern was derived from variation of lower-leg supporting pressure measured on the way of the pendulum-test. The results of inverse simulation to waveforms measured from two healthy subjects and two spastic patients showed that its accuracy was improved more highly than in the case of the linear pattern and there existed considerable difference between estimations of spasticity obtained under two patterns. A future work is to grope for possibility of practical use.</p>

DOI： 10.11239/jsmbe.Annual58.397

Electrical Impedance Myographyにおける電極間距離と電流到達距離の関係性-下肢筋の測定に向けた基礎的研究-

佐藤宏樹, 中村隆夫, 楠原俊昌, 軸屋和明, 河島隆貴, 小原謙一, 國安勝司, 花山耕三

日本生体医工学会大会プログラム・抄録集(Web) 58th S190_2 - S190_2 2019

Language：Japanese Publisher：公益社団法人日本生体医工学会

<p>Electrical Impedance Myography（EIM）は, 表面電極を用いた骨格筋の固有インピーダンス測定により, 筋線維の構造的完成度や疾患原性変化などの質的な評価指標となり得る可能性が示されている. しかし, 骨格筋は皮下脂肪などの非筋肉組織より深部に位置することから, 対象筋に応じた電極間距離の調整が必要である. 本研究は下肢筋の固有インピーダンス測定に向けた基礎的研究として, 深部筋群のEIMを想定した電極間距離と電流到達距離の関係性を調査した.本実験では, 容器に生理食塩水を入れ, 水面に設置した2つの表面電極（Ag-AgCl, 15 mm×10 mm）により, 生理食塩水のインピーダンスの大きさZをLCRメータ（4284A, Agilent）で測定した.水深xがある値以上となればZは一定値となり, 水深を浅くすると電流経路の狭くなることでZは増加するため,電極間距離D（50-190 mm, 6条件）に対して水深（4-60 mm）を 4 mm間隔で変化させてZを測定した. 電極間距離Dにおけるxに対するZを指数関数と定数との和として近似計算した. Zの推定値がこの定数値105％の値となるxを電流到達距離Lと定義した. 本実験の結果, Dが19 mmの場合, Lは31.6 mmとなった. さらに電極間距離Dと電流到達距離Lには直線的な相関関係を示した.</p>

DOI： 10.11239/jsmbe.Annual57.S190_2

Development of impedance measuring device for evaluation of skin barrier function

UEHARA OSAMU, NAKAMURA TAKAO, KUSUHARA TOSHIMASA, MATSUZAKI KENICHI, YAMAMOTO YOSHITAKE

Transactions of Japanese Society for Medical and Biological Engineering 56 S404 - S404 2018

Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p>The deterioration of skin barrier function causes symptoms such as allergy as various chemical substances may enter human body. It is very useful to quantitatively evaluate the state of the skin barrier in domains such as dermatology, nursing science and the cosmetics development. Therefore the authors developed an impedance measuring device for evaluation of skin barrier function. As the head of this device contacts the skin, the parameters, such as susceptance B and admittance Y in two kinds of frequencies, are measured in approximately five seconds. It calculates skin barrier index correlates the stratum corneum thickness. The correlation with these parameters and the stratum corneum thickness measured the confocal laser scanning microscopy, and the regression expressions for estimation of the stratum corneum thickness were examined. We found that the thickness of the stratum corneum using impedance is equivalent to the thickness of the stratum corneum by confocal laser scanning microscopy.</p>

DOI： 10.11239/jsmbe.Annual56.S404

Influence of the femoral fluctuation at the beginning of pendulum-test upon the lower-leg motion

Kusuhara Toshimasa, Nakamura Takao, Michinishi Hiroyuki, Jikuya Kazuaki, Yamamoto Yoshitake, Okamoto Takuji

Transactions of Japanese Society for Medical and Biological Engineering 57th S188 - S188 2018

Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p>At the beginning of the pendulum-test, some fluctuation is induced in the femur by its upward shifting with releasing of lower-leg. This study analyzes its influence upon lower-leg motion by simulations. The fluctuation is controlled by a viscoelastic element of the iliopsoas muscle including the sitting seat. Behavior of all over the leg is modeled as a double pendulum constructed based on the viscoelastic elements and an existing lower-leg sub-model. We analyzed the femoral motion and the lower-leg motion under the double pendulum model. It was seen from the results that a tiny and nonlinear fluctuation like that appeared in measured angular acceleration waveforms exists also in the simulated lower-leg ones, and that its amplitude increased with increases of the upward shifting or advance of spasticity. One of the urgent works is to investigate some way to remove the fluctuation from measured waveform.</p>

DOI： 10.11239/jsmbe.Annual56.S188

Influence of releasing from lower-leg support upon waveform of lower-leg motion in pendulum-test

NAKAMURA TAKAO, KUSUHARA TOSHIMASA, MICHINISHI HIROYUKI, JIKUYA KAZUAKI, YAMAMOTO YOSHITAKE, OKAMOTO TAKUJI

Transactions of Japanese Society for Medical and Biological Engineering 57th S187 - S187 2018

Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p>In order to simplify the procedure of its execution in our pendulum-test, an examiner had supported the lower-leg of the subject in a sitting situation manually until just before its start. The supporting force had however been apt to remain for a short time after its start. This study analyzed the influence of the residual supporting force on the lower-leg motion. It was assumed that the residual force decreased linearly with time. A simulator for the analysis was constructed by supplementing the function of the residual force to the existing one under such assumption. The influence on the lower-leg motion was investigated by comparing simulated waveforms with measured ones. Time when the force disappears was determined by means of reverse simulation of the measured waveform, so that both waveforms agreed as much as possible. As the results, the accuracy of the simulator increased dramatically.</p>

DOI： 10.11239/jsmbe.Annual56.S187

Influence of femur-tibia contact point shifting in pendulum-test upon lower-leg motions.

MICHINISHI HIROYUKI, KUSUHARA TOSHIMASA, NAKAMURA TAKAO, JIKUYA KAZUAKI, YAMAMOTO YOSHITAKE, OKAMOTO TAKUJI

Transactions of Japanese Society for Medical and Biological Engineering 57th S189 - S189 2018

Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

<p>It has been known from our experience that femur-tibia contact point shifting can occur inside the knee-joint in the pendulum-test by a tiny difference in lower-leg and return to the original position on the way of its execution. This study analyzes its influence on the lower-leg motions. Its shifting is expressed as an angle between the lower-leg and the straight line connecting the contact point with the knee-joint axis. The function of the return from the shifting is modeled by introducing imaginary viscoelastic elements, whose values are proportional to the magnitude of the angle. The lower-leg motion is simulated by the use of the existing pendulum-test model supplemented with the viscoelastic elements. It is shown from the results that, the larger the angle and/or the higher the spasticity of the subject is, the more the disturbance increases.</p>

DOI： 10.11239/jsmbe.Annual56.S189

リアルタイムストレス評価のためのRRI測定システムの構築

楠原俊昌, 山口大貴, 中村隆夫, 山本尚武

電子情報通信学会大会講演論文集(CD-ROM) 2018 2018

各種測定機器から得られる角層水分量の皮膚電気インピーダンスを用いた推定法について

中村隆夫, 楠原俊昌, 山本尚武, 上原治, 松崎健一

電気学会全国大会講演論文集(CD-ROM) 2017 2017

皮膚電気インピーダンスを用いた経表皮水分蒸散量(TEWL)の推定法の改善

中村隆夫, 楠原俊昌, 上原治, 松崎健一, 山本尚武

電子情報通信学会大会講演論文集(CD-ROM) 2017 2017

D-7-6 Study of Compatible Index of TEWL Using Skin Electrical Impedance for Evaluation of the Skin Barrier Function

Kusuhara Toshimasa, Nakamura Takao, Ariyoshi Hanako, Yamamoto Yoshitake

Proceedings of the IEICE General Conference 2016 ( 1 ) 84 - 84 2016.3

皮膚アドミタンスによる角層水分量の経時変化の検出

楠原俊昌, 中村隆夫, 白井喜代子, 山本尚武

電気学会全国大会講演論文集(CD-ROM) 2016 2016

D-7-12 Effects of the Skin Surface Conditions Influences on the Temporal Changes of Skin Electrical Impedance

Kusuhara Toshimasa, Nakamura Takao, Yamamoto Yoshitake

Proceedings of the IEICE General Conference 2015 ( 1 ) 95 - 95 2015.2

インピーダンス法による下肢血流の検出精度改善を目的とした不均一導体モデルの検討

楠原俊昌, 中村隆夫, 山本尚武

電気学会全国大会講演論文集(CD-ROM) 2015 2015

Two-dimensional estimation of knee joint reflex by pendulum test -In case of spastic patients-

NAKAMURA TAKAO, MICHINISHI HIROYUKI, JIKUYA KAZUAKI, KUSUHARA TOSHIMASA, YAMAMOTO YOSHITAKE, OKAMOTO TAKUJI

Transactions of Japanese Society for Medical and Biological Engineering 53 S260_01 - S260_01 2015

Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

It is well-known that the knee joint reflex of the spastic patient is facilitated by increasing of γ-motoneuron excitability and decreasing of presynaptic inhibition capability. There had been however few reports about quantification of these factors. We tried therefore to represent the knee joint reflex two-dimensionally with them. Ten waveforms of the knee-joint motion for the quantification were reconstructed from the pendulum-test data measured from stroke patients of 1 or 1+ MAS grade at supine position by Kim et al [JBSE, Vol. 6, No. 3]. Indexes of the quantification were firing-rate to γ-motoneuron H_γd and reciprocal of firing-rate to presynaptic inhibition neuron H_ie. Their normalized values were estimated by an inverse pendulum-test simulator in which both spinal-cord model and spindle model were improved so that the value of each parameter might be determined to only one. According to results of the inverse simulation, plots of (H_γd, H_ie) in the subjects showed a two dimensional extent and there existed some subjects having pretty different values even if with the same MAS and near equal R-I index.

DOI： 10.11239/jsmbe.53.S260_01

皮膚バリア機能評価を目的とした皮膚インピーダンスからの角層成分の抽出

楠原俊昌, 中村隆夫, 有吉華子, 山本尚武

電気・情報関連学会中国支部連合大会講演論文集(CD-ROM) 66th 2015

Improvement of Discrimination of Throwing Motion Using Forearm Electrical Impedance

NAKAMURA Takao, ABE Yuki, KUSUHARA Toshimasa, YAMAMOTO Yoshitake

IEICE technical report. ME and bio cybernetics 113 ( 499 ) 29 - 34 2014.3

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

The purposes of this research were ● the detection of optimal electrodes location for wrist movement and ● the improvement of hitting ratio of discrimination of throwing motion. Five parameters (Z_0,Z_∞,R_i,f_m,β) based on the frequency characteristic of the forearm electrical impedance were measured during fundamental movement of the forearm part and throwing a baseball. As a result, the optimal electrode location were the wrist joint side of a flexor carpi radialis muscle. More highly precise discrimination (96.7%) exceeding the conventional result (95.8%) were obtained using new parameters.

Other Link： http://search.jamas.or.jp/link/ui/2015113331

不均一導体モデルを用いたインピーダンスプレチスモグラフィの体肢血流評価法の改善

楠原俊昌, 中村隆夫, 山本尚武

電気学会全国大会講演論文集(CD-ROM) 2014 2014

痛みのない側に動かす「操体法」の効果の生理学的解明を求めて(2)

尾添信枝, 遠藤隆三, 中村隆夫, 住野好久

日本臨床運動療法学会雑誌 16 ( 1 ) 52 - 52 2014

不均一導体モデルを用いたインピーダンスプレチスモグラフィによる下肢血流評価

楠原俊昌, 中村隆夫, 山本尚武

電気・情報関連学会中国支部連合大会講演論文集(CD-ROM) 65th 2014

Two Dimensional Estimation of Knee Joint Reflexes for Spastic Patients Using Pendulum Test

NAKAMURA Takao, KUSUHARA Toshimasa, MICHINISHI Hiroyuki, JIKUYA Kazuaki, YAMAMOTO Yoshitake, OKAMOTO Takuji, METANI Hiromichi, TSUBAHARA Akio

IEICE technical report. ME and bio cybernetics 111 ( 482 ) 53 - 58 2012.3

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Authors have discussed the simulator to estimate reflex of the spastic patients quantitatively from knee joint angular acceleration waveforms measured by the pendulum test. In this study, we improved the simulator so that the reflex could be estimated quantitatively by two indexes. We first integrated 3 stimuli from CNS to the spinal cord into two ones (stimulus F_γ, to γ-motoneuron and stimulus F_<ie> to presynaptic inhibition neuron) corresponding to principal factors of the reflex by improving both models of the spindle and the spinal cord in the existing simulator. Next, we ascertained that the reflex could be estimated by the values of F_γ, and F_<ie> that were determined from the angular acceleration waveform by the use of the simulator. This method will be notably advance quality of the spasticity estimation under the pendulum test in the final stage.

Other Link： http://search.jamas.or.jp/link/ui/2012275904

湿式電極における皮膚バリア機能評価のための皮膚インピーダンスモデルの構築

山本尚武, 白井喜代子, 楠原俊昌, 中村隆夫

電気学会全国大会講演論文集 2012 ( 3 ) 2012

疲労評価のための低レートサンプリングによるRRIの検出

楠原俊昌, 加藤光典, 田中伸弥, 中村隆夫, 山本尚武

電気学会全国大会講演論文集 2012 ( 3 ) 2012

楽な側に動かす「操体法」の効果の生理学的解明を求めて

尾添信枝, 中村隆夫, 鈴森康一, 住野好久

臨床運動療法研究会誌 14 ( 1 ) 31 - 31 2012

ペンドラムテストへの応用を目的とした2個の一軸加速度計による膝関節角度および角加速度の同時検出

楠原俊昌, 中村隆夫, 軸屋和明, 道西博行, 山本尚武, 岡本卓爾

生体医工学 50 ( 4 ) 2012

生体電気インピーダンスを用いた肘関節の屈曲伸展運動における角度推定

森脇明啓, 中村隆夫, 楠原俊昌, 山本尚武

生体医工学 50 ( 4 ) 2012

Estimation of Range of Input Value from Central Nervous System to α-motoneuron in Pendulum-test Model : In Case of Spastic Patients

NAKAMURA Takao, KUSUHARA Toshimasa, MICHINISHI Hiroyuki, JIKUYA Kazuaki, YAMAMOTO Yoshitake, OKAMOTO Takuji

IEICE technical report 111 ( 121 ) 95 - 100 2011.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

The authors developed a pendulum test model that can simulate knee-joint motions of spastic patients. It is however impossible to estimate input values (F_γ, F_i, F_e) from CNS to the spinal-cord by reverse simulation of measured knee-joint motion. In the report, we will first detail the muscle spindle sub-model, so that its output may have a product component of γ-motoneuron excitability F_γ and muscle spindle stretch speed V. We will next clarify the range of their possible values in 3 dimensional space based on the known clinical knowledge, and finally estimate the value of the input F_e to α-motoneuron by the use of measured knee-joint motion by another approach. If F_e is known, we can estimate other inputs by reverse simulation.

Other Link： http://search.jamas.or.jp/link/ui/2012002122

皮膚バリア機能評価のための皮膚インピーダンスモデルの構築

山本尚武, 清島繁幸, 宗美淳志, 白井喜代子, 楠原俊昌, 中村隆夫

電気学会全国大会講演論文集 2011 ( 3 ) 2011

2個の一軸加速度計を用いた膝関節角度の測定システム

楠原俊昌, 軸屋和明, 中村隆夫, 道西博行, 山本尚武, 岡木卓爾

生体医工学 49 ( 5 ) 2011

Accuracy of Knee-joint Angular Acceleration Detector by Using Two Linear Accelerometers for Pendulum Test

KUSUHARA Toshimasa, JIKUYA Kazuaki, NAKAMURA Takao, MICHINISHI Hiroyuki, YAMAMOTO Yoshitake, OKAMOTO Takuji

IEICE technical report 110 ( 120 ) 17 - 20 2010.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

In pendulum test, a goniometer has been used to know knee joint motions. In this study, we propose a new method to detect the knee-joint motion precisely as a change of angular acceleration without disturbing its natural movement. Two linear accelerometers are attached on an aluminum bar, the end of which is fixed to the referential goniometer. The pendular motion is induced by swinging the bar, and measured accelerometers and the goniometer as an angular acceleration waveform and an angle waveform, respectively. The waveforms are compared each other to study the accuracy of the proposed method. It is confirmed that the proposed method has enough precision for pendulum test of the knee joint motions.

Other Link： http://search.jamas.or.jp/link/ui/2010320073

Quantitative Estimation of Spasticity in Knee-joint Using Pendulum-test Model

NAKAMURA Takao, KUSUHARA Toshimasa, MICHINISHI Hiroyuki, JIKUYA Kazuaki, YAMAMOTO Yoshitake, OKAMOTO Takuji

IEICE technical report 110 ( 120 ) 21 - 26 2010.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

The authors have constructed a model that can precisely simulate knee joint angular acceleration waveforms measured at pendulum test, and have also improved the model so that it may convert the waveform of any subject into that of a standard virtual one with the same degree of spasticity. In the report, we propose a way to estimate spasticity using the latter model. We first clarify from the results of simulation that it is difficult to discriminate the difference between waveforms induced by two inputs (F_i, F_N) at pendulum test. Second we show that many combinations of (F_i, F_N) correspond to only one value of the index obtained from any existing method for spasticity estimation and, based on the result, try to estimate the spasticity quantitatively using a two dimensional space separated into four regions according to its degree. Each of the marks (●,◎,○,□) shows the number of reflex generations on the way of pendulum test.

Other Link： http://search.jamas.or.jp/link/ui/2010320074

投球障害予防のための前腕部電気インピーダンスを用いた投球動作の判別

中村隆夫, 杉原誠治, 楠原俊昌, 山本尚武

生体・生理工学シンポジウム論文集 25th 2010

A Detailed Model for Knee Joint Acceleration Motions Obtained by Pendulum Test

K. Jikuya, H. Michinishi, T. Nakamura, T. Kusuhara, Y. Yamamoto, T. Okamoto

WORLD CONGRESS ON MEDICAL PHYSICS AND BIOMEDICAL ENGINEERING, VOL 25, PT 4: IMAGE PROCESSING, BIOSIGNAL PROCESSING, MODELLING AND SIMULATION, BIOMECHANICS 25 ( IV ) 472 - 475 2010

Precise Measurement System for Knee Joint Motions at Pendulum Test Using Accelerometer - Detection of Angular Acceleration by Two Linear Accelerometers

Y. Yamamoto, K. Jikuya, T. Nakamura, T. Kusuhara, H. Michinishi, T. Okamoto

WORLD CONGRESS ON MEDICAL PHYSICS AND BIOMEDICAL ENGINEERING, VOL 25, PT 4: IMAGE PROCESSING, BIOSIGNAL PROCESSING, MODELLING AND SIMULATION, BIOMECHANICS 25 ( IV ) 165 - 168 2010

皮膚電気インピーダンスを用いた自動車運転時の覚醒水準のモニタリング

楠原俊昌, 小林恭平, 中村隆夫, 山本尚武

生体医工学 47 ( 3 ) 2009

自動車運転時のドライバーの皮膚電気インピーダンスの計測

楠原俊昌, 小林恭平, 中村隆夫, 山本尚武

日本生体医工学会大会プログラム・論文集(CD-ROM) 48th 2009

Discrimination of Continuous Movement of Wrist Joint Using Forearm Electrical Impedance

NAKAMURA Takao, KUSUHARA Toshimasa, YAMAMOTO Yoshitake

IEICE technical report 108 ( 126 ) 1 - 4 2008.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

The discriminant analysis was used to discriminate between six movements of forarm -palmar flexion, dorsi flexion, ulnar deviation, radial deviation, pronation and supination- using change ratios of four parameters (R_e, R_i, f_m, β) of forearm electrical impedance. When the joint angle in the continuous movement was more than 40 degrees, we could discriminate among the six movements. The reason why there were a lot of misdiscrimination in less than 40 degrees of angle joint was considered as follows: the discriminant equations were inappropriate for small joint angle, SN ratio was smaller then one in large joint angle. These results were suggested that the discriminant analysis using parameters of electrical impedance could be useful for discrimination of continuous movement.

Other Link： http://search.jamas.or.jp/link/ui/2008365766

Measurement of Electrodermal Activities for Monitoring of Arousal Level during Driving the Vehicle

楠原俊昌, 小林恭平, 中村隆夫, 山本尚武

システム・情報部門学術講演会講演論文集 2008 2008

ECIS法を用いたエストロゲン負荷細胞の微細動態の定量的評価

合田典子, 山本尚武, 片岡則之, 中村隆夫, 楠原俊昌, 毛利聡, 成瀬恵治, 梶谷文彦

日本生体医工学会大会プログラム・論文集(CD-ROM) 47th 2008

皮膚電気活動におけるSkin Impedance Reflex(SIR)評価法の改善の試み

山本尚武, 白井喜代子, 楠原俊昌, 中村隆夫

日本生体医工学会大会プログラム・論文集(CD-ROM) 47th 2008

前腕部電気インピーダンスを用いた手関節動作の判別

中村隆夫, 岸本明久, 楠原俊昌, 山本尚武

日本生体医工学会大会プログラム・論文集(CD-ROM) 47th 2008

Consideration of Running Form Using Lower Leg Electrical Impedance

中村隆夫, 北脇知己, 渡辺彰吾, 楠原俊昌, 矢野博己, 池田敏, 加藤浩, 山本尚武, 岡久雄

電子情報通信学会技術研究報告 107 ( 154(MBE2007 20-43) ) 39 - 42 2007.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

We have analyzed running for 90 minutes on a treadmill using lower leg electrical impedance. The subjects wore the three types of running shoes in this experiment. An acceleration of the ankle joint angle and surface electromyogram (EMG) of Vastus lateralis (VL), Tibialis anterior (TA) and Gastrocnemius (GC) were measured. The subjects also replied the questionnaire that was including the feeling of the shoes and fatigue before, during and after the running. The impedance data during the running was compared with the acceleration, EMG and questionnaire. As results, we could detect the characteristics of the movement which reflected the ankle joint angle and adapted to the character of the shoe, and evaluate the stability of the movement. We have found that the existence of sense of incongruity of shoes was influenced a change of impedance waveform. The measurement of lower leg electrical impedance might be able to monitor running form and/or to evaluate physical fatigue during treadmill running.

下腿部電気インピーダンスを用いたシューズの違いによるランニングフォームへの影響についての検討

中村隆夫, 楠原俊昌, 北脇知己, 山本尚武, 池田敏, 岡久雄, 矢野博巳, 加藤浩

日本生体医工学会大会プログラム・論文集(CD-ROM) 46th 2007

ECIS法を用いた放射線被曝の実時間連続評価法の開発に関する研究

合田典子, 山本尚武, 中村隆夫, 丸山敏則, 楠原俊昌

INNERVISON 22 ( 7 ) 7 - 7 2007

Development of high time resolution measurement system of frequency characteristics in bioelectrical impedance for biodynamic analysis

Takao Nakamura, Toshimasa Kusuhara, Yoshitake Yamamoto

SPIE Proceedings 6357 63571s-1 - 63571s-5 2006.11

Motion Discrimination of Parameter Analysis of Forearm Electrical Impedance

NAKAMURA Takao, KUSUHARA Toshimasa, YAMAMOTO Yoshitake

IEICE technical report 106 ( 162 ) 25 - 28 2006.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

The analysis of bioelectrical impedance with some independent parameters is used for accurate evaluation or discrimination of human motion. This paper shows results of motion discrimination of wrist joint using four parameters of forearm electrical impedance: Z_0, Z_∞, f_m and β. Discriminant analysis was used to determine which change ratios of four parameters of forearm electrical impedance with each movement discriminate between six motions. As results of a subject with 60 data, hitting ratio was very high and 95.0%. Two supinations and on radial deviation were mistaken. There were shorter Mahalanobis distances between centroid of supination groups and centroid of ulnar/radial deviation groups. This was caused by differences of impedance change between subjects in even same motion. This analysis using parameters of electrical impedance could be motion discrimination.

Other Link： http://search.jamas.or.jp/link/ui/2007008189

一般口演I-1 各種身体運動に伴う生体電気インピーダンスのパラメータ分析(第28回中国四国支部大会抄録)

中村隆夫, 楠原俊昌, 山本尚武

生体医工学 : 日本エム・イー学会誌 44 ( 2 ) 330 - 331 2006.6

一般口演I-2 嚥下機能の経時変化の追跡のための生体電気インピーダンスの計測と解析(第28回中国四国支部大会抄録)

楠原俊昌, 中村隆夫, 白川靖博, 森恵子, 猶本良夫, 山本尚武

生体医工学 : 日本エム・イー学会誌 44 ( 2 ) 331 - 331 2006.6

身体運動の判別・評価のための生体電気インピーダンスのパラメータ分析

中村隆夫, 楠原俊昌, 山本尚武

日本生体医工学会大会プログラム・論文集 45th 2006

ECIS法を用いたX線照射細胞の微細動態のリアルタイム評価

楠原俊昌, 合田典子, 中村隆夫, 丸山敏則, 山本尚武

日本生体医工学会大会プログラム・論文集 45th 2006

Analysis of Bioimpedance Parameters Using High Time Resolution Measurement System

NAKAMURA Takao, KUSUHARA Toshimasa, YAMAMOTO Yoshitake

IEICE technical report. ME and bio cybernetics 105 ( 221 ) 31 - 34 2005.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

In order to analyze biodynamics using bioelectrical impedance, we have developed a measurement system for frequency characteristics of impedance with high time resolution of 1ms. This paper describes repeated measurement controlled by programming and parameters analysis using this system. The program can be controlled in the shortest interval 4ms and maximum 16,000 repeated times. In results of equivalent circuit with variable resistance, the accuracy of analysis was less the 1% errors. Considering the results of neck electrical impedance (IPG) during swallowing, central frequecy of Cole-Cole arc &fnof;_m and degree of distribution of relaxation time β will be promising parameters for biodynamic analysis.

Other Link： http://search.jamas.or.jp/link/ui/2005266103

Quantitative Evaluation Method Using Electrical Characteristics for Diagnosis of Skin Properties

SHIRAI Kiyoko, NAKAMURA Takao, KUSUHARA Toshimasa, DOHI Satoshi, YAMAMOTO Yoshitake

IEICE technical report. ME and bio cybernetics 105 ( 221 ) 35 - 38 2005.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

The skin trouble like the atopic dermatitis becomes a major social issue recently. However it is not easy to diagnose the skin trouble only by a qualitative evaluation such as the ocular inspection and the palpation. It is useful to diagnose and treat of the skin trouble that skin characteristic is evaluated by a quantitative evaluation non-invasively. The subjects were grouped in 6 categories with their sexuality and state of the skin. The skin impedance was measured in the forearm by the 3-electrode method and the frequency characteristics were examined by the automatic balanced bridge method using a precision LCR meter. The measurement results were analyzed by the principal component analysis and t authorization. We indicated to distinguish the state of the skin by the measurement value of skin impedance non-invasively.

Other Link： http://search.jamas.or.jp/link/ui/2005266104

携帯電話を活用したTV会議システムの遠隔医療・保健・福祉支援への適用

北脇知己, 大塚元美, 奥田博之, 小田慈, 岡田宏基, 中村隆夫, 東義晴, 後藤佐知子, 西田真寿美, 岡久雄, 岡久雄, 秦正治, 岡本卓爾, 山井成良, 三垣みつえ, 原田和成, 光本幸夫, 川田智恵子, 公文裕巳, 公文裕巳, 公文裕巳

日本ME学会大会論文集 44th 2005

各種前腕皮膚における電気特性の多変量解析を用いた検討

山本尚武, 白井喜代子, 中村隆夫, 楠原俊昌, 土肥哲

日本ME学会大会論文集 44th 2005

Measurement of neck electrical impedance and evaluation of swallowing function Invited

中村隆夫, 楠原俊昌, 山本尚武

日本バイオレオロジー学会誌(B&R) 第19巻、3号、pp.10-18 ( 3 ) 116 - 124 2005

臨床における生体計測のための皮膚インピーダンス標準化モデル

白井喜代子, 山本尚武, 中村隆夫, 楠原俊昌

岡山県母性衛生 ( 21 ) 2005

A High Time Resolution Measurement System for Bioimpedance Analysis in Biodynamics

NAKAMURA Takao, KUSUHARA Toshimasa, YAMAMOTO Yoshitake

IEICE technical report. ME and bio cybernetics 104 ( 179 ) 9 - 12 2004.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

In order to analyze impedance parameters in biodynamics, the measurement of frequency characteristics with a high time resolution are required. Therefore we have developed a measurement system for impedance with time resolution of 1 ms. A voltage E_A, which consisted of basic wave and 9 kinds of harmonic wave from 1 kHz to 1 MHz, were converted to current. The current flowed through human body and a potential voltage, Ey was detected in the measured part. After A/D conversion of E_V and E_A in the sampling frequency 2 MHz, data number 2048 points, the impedance were calculated. The measured time 1.024 ms was the period of the basic wave and time resolution of this system.

Other Link： http://search.jamas.or.jp/link/ui/2006177696

Construction of Standardization Model of Skin Impedance for Measurement of Biological Signal

SHIRAI Kiyoko, NAKAMURA Takao, KUSUHARA Toshimasa, YAMAMOTO Yoshitake

IEICE technical report. ME and bio cybernetics 104 ( 179 ) 1 - 4 2004.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Skin impedance with the feature which can be measured non-invasively with simple apparatus is suitable for measurement of biological signal, and there are many application measurement researches using it. A measurement value of skin impedance contains not only the change of target factor but also feature of individual factor and difference of a body part, so it is hard to evaluate suitably. In order to carry out application measurement more correctly, we proposed standardization model of skin impedance built based on measurement data. Correlation with measured value and model skin impedance was high in each parameter. Coefficients of variation of normalization of skin impedance turned into 60% of coefficients of variation of measured value, and have checked validity. Utilizing a standardization model for biological signal measurement has high diagnostic accuracy, and it is useful to future application measurement.

Other Link： http://search.jamas.or.jp/link/ui/2006177694

1.インピーダンス咽頭図(IPG)による高齢者の嚥下機能評価(第26回中国四国支部大会抄録)

楠原俊昌, 中村隆夫, 森恵子, 山本尚武

生体医工学 : 日本エム・イー学会誌 42 ( 2 ) 142 - 142 2004.6

3.身体運動解析のための生体インピーダンスの高時間分解能測定システムの開発(第26回中国四国支部大会抄録)

中村隆夫, 大橋充明, 玉井義隆, 楠原俊昌, 山本尚武

生体医工学 : 日本エム・イー学会誌 42 ( 2 ) 142 - 142 2004.6

食道癌手術前後の嚥下機能変化の評価におけるインピーダンス咽頭図(IPG)の有効性の検討

楠原俊昌, 中村隆夫, 白川靖博, 森恵子, 猶本良夫, 山本尚武

日本ME学会秋季大会論文集 18th 2004

インピーダンス咽頭図(IPG)による加齢に伴う嚥下機能変化の分析

楠原俊昌, 中村隆夫, 森恵子, 白川靖博, 猶本良夫, 山本尚武

日本ME学会大会論文集 43rd 2004

身体運動時におけるFFTによる生体インピーダンス解析のための計測システム

中村隆夫, 楠原俊昌, 大橋充明, 玉井義隆, 山本尚武

日本ME学会大会論文集 43rd 2004

生体情報計測のための皮膚インピーダンスの標準化モデルの構築

白井喜代子, 山本尚武, 中村隆夫

日本ME学会大会論文集 43rd 2004

Application of Impedance Pharyngography (IPG) and Parameter Analysis for Quantitative Appraisal of Change of Swallowing Function

楠原俊昌, 中村隆夫, 白川靖博, 森恵子, 猶本良夫, 山本尚武

電気学会計測研究会資料 IM-04 ( 35-49 ) 2004

An Analysis Method for Impedance Pharyngography in Chin-Tuck Swallowing

NAKAMURA Takao, KUSUHARA Toshimasa, MORI Keiko, YAMAMOTO Yoshitake

IEICE technical report. ME and bio cybernetics 103 ( 184 ) 47 - 50 2003.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

A Chin-Tuck swallowing is recommended for the rehabilitation of patient of dysphasia. However Impedance Pharyngography (IPG) with Chin-Tuck swallowing includes impedance change which is influenced by neck flexion. Therefore it is difficult to evaluate swallowing using IPG. This paper describes how to eliminate component of impedance change by neck flexion from IPG in Chin-Tuck swallowing. We defined the correction IPG using an elimination method of the impedance change, which was estimated by angle of neck joint. There was high similarity between the correction IPG with Chin-Tuck swallowing and normal IPG, namely without Chin-Tuck swallowing. This method can be expected to rehabilitation fields.

Other Link： http://search.jamas.or.jp/link/ui/2004268509

頷き嚥下におけるインピーダンス咽頭図の解析法

中村隆夫, 楠原俊昌, 井上和哉, 森恵子, 山本尚武

日本ME学会大会論文集 42nd 2003

臨床用嚥下機能診断装置のためのインピーダンス咽頭図(IPG)のパラメータ解析に関する検討

楠原俊昌, 中村隆夫, 山本尚武

日本ME学会秋季大会論文集 17th 2003

生体電位計測のための基準電極に及ぼす皮膚電気活動の影響

白井喜代子, 山本尚武, 中村隆夫, 楠原俊昌

日本ME学会大会論文集 42nd 2003

生体インピーダンス測定用同心円電極の評価領域

山本尚武, 白井喜代子, 合田典子, 中村隆夫, 楠原俊昌, 奥田博之

日本ME学会大会論文集 42nd 2003

Consideration of Waveform of Impedance Pharyngography (IPG) in Patients with Dysphagia

KUSUHARA Toshimasa, NAKAMURA Takao, MORI Keiko, YAMAMOTO Yoshitake

IEICE technical report. ME and bio cybernetics 102 ( 196 ) 49 - 52 2002.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Until now, we have proposed Impedance Pharyngography (IPG) using neck electrical impedance, as a quantitative method for evaluating swallowing function. Now, we are carrying out IPG measurement of patients with dysphagia to achieve clinical applications. In this study, we considered differences of characteristics of IPG waveforms between healthy subjects and patients, and differences of characteristics of IPG waveforms in the vicinity of operation, depending on results of IPG measured for patients with dysphagia. Additionally, we propose definition of effective parameters for classifying healthy subjects and patients by a quantitative evaluation method.

Other Link： http://search.jamas.or.jp/link/ui/2003083514

女性の前腕表皮角質層の水分測定

白井喜代子, 山本尚武, 奥田博之, 中村隆夫, 楠原俊昌, 合田典子

日本ME学会大会論文集 41st 2002

嚥下活動評価のための嚥下音の特性に関する検討

楠原俊昌, 中村隆夫, 森恵子, 山本尚武

日本ME学会大会論文集 41st 2002

Using Electrodermal Activity for Analysis of the Effect of Different Sense Stimulations on Humans

Kiyoko Shirai, Yoshitake Yamamoto, Takao Nakamura, Toshimasa Kusuhara, Hiroyuki Okuda

Journal of International Society of Life Information Science 2002

Using Electrodermal Activity for Analysis of the Effect of Different Sense Stimulations on Humans(<Main Topics>Human PSI Forum "Human Potential Science" International Forum : Physical and Physiological Approach Joint with "Mystery of Mind and Body" International Forum and The Fourteenth Symposium on Life Information Science (International Version) 22-27 August 2002, OVTA, Makuhari, Chiba (near Tokyo), Japan)

SHIRAI Kiyoko, YAMAMOTO Yoshitake, NAKAMURA Takao, KUSUHARA Toshimasa, OKUDA Hiroyuki

Journal of International Society of Life Information Science 20 ( 2 ) 622 - 626 2002

Language：English Publisher：International Society of Life Information Science

The feelings of comfortableness and unpleasantness are the result of acts on the consciousness by information received through the five senses. There are indivisual differences in grasping feelings by subjective information. Therefore, it is important to use an index with objectivity. In this study, we examined the effect of two different sense stimulations on humans. We used an inipedance method which is a good index to know a person's emotion. The subjects were 8 adults. Sense of touch stimulation was given to the back with a massage machine. Classic music was used for the hearing stimulation. The measurement conditions were both at the same time and individually. The subjects reacted sensitively to the sense of touch stimulation. On the other band, the hearing stimulation reaction was dull. For the sense of touch stimulation, the subject's condition after stimulation in SIR did not return to the control condition before stimulation. We supposed that the sense of touch stimulation had some effect on humans. For two simultaneous stimulations, the reaction was different from that of the single stimulation. From these things, we clarified that various sense stimulations were affecting on humans. We can expect that application of sense stimulation gives an enhanced cure effect.

DOI： 10.18936/islis.20.2_622

Measurement and evaluation of swallowing in subject with advanced age or swallowing disorders by impedance pharyngography

NAKAMURA Takao, KUSUHARA Toshimasa, MORI Keiko, YAMAMOTO Yoshitake

16 75 - 78 2001.8

Consideration to Impedance Pharyngography (IPG) of Swallowing Disorders

KUSUHARA Toshimasa, NAKAMURA Takao, MORI Keiko, YAMAMOTO Yoshitake

IEICE technical report. ME and bio cybernetics 101 ( 181 ) 91 - 96 2001.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Swallowing disorders are a serious problem occurring in nerve or muscle disease, advanced age and so on. Unfortunately, it is difficult to evaluate swallowing disorders quantitatively. For this reason, we previously proposed a new method, impedance pharyngography(IPG), for evaluating swallowing disorders quantitatively and noninvasively by measuring neck electrical impedance during swallowing. In this study, the efficacy of this method was tested in a cohort of patients and advanced age, not only healthy subjects who were once measured mainly. And we have considered characteristics of each subject's result of IPG measurement.

Other Link： http://search.jamas.or.jp/link/ui/2002051760

局所インピーダンス計測のための多重同心電極の開発

山本尚武, 中村隆夫, 磯崎晃一, 白井喜代子, 奥田博之

日本ME学会大会論文集 40th 2001

頚部電気インピーダンスを用いたほ乳動作計測の基礎的検討

中村隆夫, 津川英範, 山本尚武, 合田典子, 奥田博之

日本ME学会大会論文集 40th 2001

Variations of parameters of bioelectrical impedance during biodynamics

NAKAMURA Takao, YAMAMOTO Yoshitake

IEICE technical report. ME and bio cybernetics 100 ( 190 ) 1 - 7 2000.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Variations of human limb electrical impedance during biodynamics were caused by variations of equivalent cross sectional area of muscle and variations of blood volume. In this work, we explained variations of the impedance with variations of parameters of an equivalent circuit. The equivalent circuit consisted of five individual parameters as follows: extracellular fluid resistance, 'R_e', intracellular fluid resistance, 'R_i', characteristic frequency of dispersion, 'f_m' and parameters of dispersion of relaxation time, 'α' and 'β'. Impedances of forearm and upper arm were measured during flexion and extension of joints in upper limb. The equivalent series resistance R was strongly influenced by R_e and R_i. In case of the maximum flexion of the elbow joint, R of upper arm was influenced f_m. This means that a polarization of cell membrane changes and influences impedance during movement.

Other Link： http://search.jamas.or.jp/link/ui/2001036498

Modeling of Electrodermal Activity

TAKAYAMA Keiichi, ISOSAKI Kouichi, YAMAMOTO Yoshitake, NAKAMURA Takao

IEICE technical report. ME and bio cybernetics 99 ( 688 ) 85 - 90 2000.3

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Electrodermal sctivity (EDA) is one of parameters which show a mind activity condition. EDA has been used for a polygraph or early detection and early treatment of mental disorder for many years. EDA is also used for image training of sports players these days. Although the applications of EDA have made advances, the mechanismof EDA is not sufficiently made clear. In this study, we measured skin potential and skin impedance simultaneously, and proposed an EDA model cosidering changes of skin potential and skin impedance. We confirmed the validity of the model using a simulation.

Other Link： http://search.jamas.or.jp/link/ui/2000231091

Analysis of Swallowing Using Swallowing Sound

TSUGAWA Hidenori, YAMAMOTO Yoshitake, NAKAMURA Takao

IEICE technical report. ME and bio cybernetics 99 ( 178 ) 31 - 36 1999.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

It is an aging society and people complaining of swallowing trouble have been increasing. We proposed a new method using swallowing sound to diagnose swallowing trouble. The method is simple and noninvasive. We examined reproduction and difference of swallowing sound which is due to kinds of food. And we examined the relation between swallowing sound and IPG (Impedance Pharyngography) using the neck electrical impedance.

Other Link： http://search.jamas.or.jp/link/ui/2000027039

Estimation of the Ankle Angle Using Leg Electrical Impedances

SUKO Toshiyuki, YAMAMOTO Yoshitake, NAKAMURA Takao

IEICE technical report. ME and bio cybernetics 98 ( 174 ) 23 - 30 1998.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Untill now, we have estimated the change of the ankle joint angle using calf impedance. The purpose of this report is to estimate the ankle angle during walking using thigh impedance and calf inpedance. First, we compared an estimation using the calf impedance only with an estimation using the thigh impedance and the calf inpedance. We confirmed that the estimation using two impedances was higher precise than the other. In cases of estimation of the ankle joint angle during walking, the calf impedance is influenced by the ankle joint moment with the floor reaction force. Therefore, we investigated relationships between the floor reaction force and the calf impedance. Considering the results, we estimated the ankle joint angle during walking using three parameters, which were the thigh impedance, the calf impedance and the floor reaction force.

Swallowing Evaluation Using Parameter Analysis of IPG

KUSUHARA Toshimasa, NAKAMURA Takao, YAMAMOTO Yoshitake, SEKI Yasuhiko, AKASHI Ken, JIKUYA Kazuaki

IEICE technical report. ME and bio cybernetics 98 ( 174 ) 15 - 21 1998.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

We have proposed IPG (Impedance Pharyngography) using the neck electrical impedance for evaluation of swallowing. In this study, we tried parameter analysis in order to establish with the application of IPG to evaluating of swallowing as more effective method. That is to say, we realized relative and quantitative evaluating method by parameter expression which is paid attention to normality, stability and motion of IPG. Further, we analyzed parameter analysis about IPG of young people and elderly, and we examined effectiveness of our method by expressing influence of aging.

Examination on wallowing activity evaluation method by parametric analysis of IPG.

楠原俊昌, 津川英範, 山本尚武, 中村隆夫

電気・情報関連学会中国支部連合大会講演論文集 49th 1998

Electrical and optical characteristics of flowing blood in an artificial vessel with stenosis

NAKAMURA Takao, LINDBERG Lars-Goran, YAMAMOTO Yoshitake, OBERG P. Ake

IEICE technical report. ME and bio cybernetics 97 ( 215 ) 65 - 70 1997.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

The purpose of this study was to investigate the characteristics of light transmission and electrical impedance of flowing blood in an artificial vessel including stenosis. The artificial blood vessel consisted of a rigid flow-through model. The method of impedance measurement used the four-electrodes technique based on sinusoidal current (10 kHz). Light (940 nm) was guided to the model by an optical fiber and transmitted light and was picked up by a similar fiber on the opposite side. Relative change in light transmission and electrical impedance dacreased with increasing blood flow in general. But the relative change in light transmission and electrical impedance varied differently comparing measurements close to the stenosis and at different distances from the stenosis.

Investigation of IPG by Multi Channels Impedance Measurement for Swallowing Evaluation

KUSUHARA Toshimasa, YAMAMOTO Yoshitake, NAKAMURA Takao, SEKI Yasuhiko, AKASHI Ken, JIKUYA Kazuaki

IEICE technical report. ME and bio cybernetics 97 ( 215 ) 31 - 37 1997.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

We have proposed IPG(Impedance Pharyngography) for analysis of swallowing. Now, we discussed about using IPG to improve reliableness and establish diagnosis basis. That is to say, we measured neck electrical impedances simultaneously using IPG measurement application with multi channels. First, we measured IPG and Electroglottography, which using neck electrical impedance like IPG. From the result, we discussed about formative mechanism of IPG and activity of organs which are concerned with swallowing. Next, we specified the organ which is concerned with IPG forming from result of divisional measurement to the front and side of neck.

Measurement of Neck Electrical Impedance by Multi Channel for Swallowing Analysis.

楠原俊昌, 山本尚武, 中村隆夫, 中桐栄樹

電気学会全国大会講演論文集 1997 ( 1 ) 1997

Examination of organism linearity in multichannel impedance measurement.

楠原俊昌, 山本尚武, 中村隆夫, 椙本憲洋

電気・情報関連学会中国支部連合大会講演論文集 48th 1997

Investigation of neck electrical impedance during swallowing

NAKAGIRI Shigeki, YAMAMOTO Yoshitake, NAKAMURA Takao, SEKI Yasuhiko, AKASHI Ken, JIKUYA Kazuaki

IEICE technical report. ME and bio cybernetics 96 ( 150 ) 41 - 48 1996.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

We have measured and discussed a number of neck electrical impedances during swallowing, toward the improvement of reliability and the establishment of diagnostic bases for the swallowing disordered inspection. There are a little variations among the swallowing movements, even if in the same subject. Finst, we have discussed about the influence that the following factors have on impedance waveform : the variations of the swalloing movement, the difference the reappearance of electrodes attaching positions and the influence that the difference among food and drink cause. Next we have also discussed the mechanism of impedance pharyngography in consideration of impedances of smaller measured parts, which are parts of normal measured part, and variations of neck electrical impedance vectors on the impedance plane during swallowing.

Examination of deglutition activity of cervix electric impedance by simultaneous measurement.

中桐栄樹, 楠原俊昌, 山本尚武, 中村隆夫

電気・情報関連学会中国支部連合大会講演論文集 47th 1996

Characteristics of neck electrical impedance for swallowing evaluation

YAMAMOTO Yoshitake, NAKAMURA Takao, SEKI Yasuhiko, AKASHI Ken, MIZUNO Masayasu, JIKUYA Kazuaki

IEICE technical report. ME and bio cybernetics 95 ( 177 ) 1 - 8 1995.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Recently videofluorography has been used for evaluation of swallowing function in rehabilitation field. But it is difficult to evalute swallowing disorder quantitatively. And it has problems of exposure for daily use. We have proposed evaluation methods of swallowing using bioelectrical impedance method which have advantages of easy handle and non-invasive measurement. This paper describes ・development of bioelectrical impedance meter, ・frequency characteristics of neck electrical impedance, ・results and discussion of relationships between neck electrical impedances and locations of electrodes or subjects.

INSTANTANEOUS MEASUREMENT OF ELECTRICAL PARAMETERS IN PALM DURING ELECTRODERMAL ACTIVITY

Y YAMAMOTO, H ISSHIKI, T NAKAMURA

IMTC/95 - 1995 IEEE INSTRUMENTATION/MEASUREMENT TECHNOLOGY CONFERENCE, CONFERENCE PROCEEDINGS 602 - 606 1995

Automatic sensing device of electrical characteristic of living tree

Yamamoto, Yoshitake, Harada, Hiroshi, Yasuhara, Kiyotaka, Nakamura, Takao

Conference Record - IEEE Instrumentation and Measurement Technology Conference 2 1994

CONSIDERATION OF NORMALIZATION OF HUNAN LIMB ELECTRICAL IMPEDANCE FOR BIODYNAMIC ANALYSIS

Nakamura Takao, Yamamoto Yoshitake

IEICE technical report. ME and bio cybernetics 93 ( 144 ) 15 - 20 1993.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

We have proposed a method of biodynamic analysis which used the relationship between changes of human limb electrical impedance and human movement.In comparision with impedance among subjects in human movement,the impedance value and the impedance change varies because of the difference of structure of human body.Accordingly there was a problem which it was difficult to apply impedance data of a subject to biodynamic analysis of others.In this paper impedance among subjects was normalized and was fundamentally investigated for general biodynamic analysis.

Telemetry system of measurement of human limb electrical impedance and its application for movement analysis.

山本尚武, 中村隆夫, 相本和巳, 藤井茂, 南謙治, 山本辰馬, 辻博明

電子情報通信学会技術研究報告 90 ( 151(MBE90 40-54) ) 1990

Equivalent circuit of electric impedance of plants, and its application.

山本尚武, 山本辰馬, 中村隆夫, すう偉宏

電気学会全国大会講演論文集 1989 ( 12 ) 1989

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