Faculty Profiles - NAKAMURA Takao

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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

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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.

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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

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