Faculty Profiles - NAKAMURA Takao

Papers - NAKAMURA Takao

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Development of human limb volume meter for evaluation of edema Reviewed

14 ( 1 ) 31 - 35 2003.12

Authorship：Lead author Language：Japanese

Quantitative evaluation of the edema is important for perinatal medicine. In a conventional method, the volume of human limb has been estimated by 2 circumferences of the measurement position, which is measured with the tape measure. However, the following errors makes this measurement insufficient; ・the error by the way of winding of a measure to the measurement position, ・the error between volume of model geometry of measurement position and one of real shape of measurement position and so on.Then, we have developed a volume meter of human limb for the edema evaluation, which is high precision and suitable for the everyday use. Archimedes' principle was applied as this measurement principle. The mass change of water tankwith water, when the measurement part water in, was converted to volume of measurement part. The linearity, resolution, stability. reproducibility of the volume meter was investigated. Considering these results, we found that the specification of this equipment was high precise as follows; maximum volume of 25,000 cm(3), resolutionof 1 cm(3), nonlinearity of 0.007%. We also measured the diurnal volume change of foot and lower leg in three subjects. We found that the differences between foot and lower leg or among the subjects. The developed volume meter can be expected to apply to quantitative evaluationof the edema.

DOI： 10.18926/15205

Other Link： http://search.jamas.or.jp/link/ui/2004171082

Impedance Pharyngography for Diagnosis of Swallowing Disorders Reviewed

Yoshitake Yamamoto, Takao Nakamura, Toshimasa Kusuhara, Keiko Mori

Biocybernetics and Biomedical Engineering 22 ( 4 ) 97 - 103 2002

Consideration to the change of swallowing sense after operation of esophagus cancer - Evaluation of swallowing activity by using IPG and swallowing sound - Reviewed

12 ( 1 ) 53 - 62 2001

Language：Japanese

The esophagus cancer patient is conscious of passage disorder due to esophagus tumor, to greater or less degrees. Many of patients diagnosed as the esophagus cancerdecide to take operation, because they want to come to be able to eat as easily as before they are diagnosed as esophagus cancer. However many patients encounter the change of swallowing sense. In the long run, they must swallow consciously when they eat everything. They are not informed about the change of swallowing sense. Therefore, the patient feels strong anxiety when they noticed about the change. This time, we had an interview about the change of swallowing sense after operation to the patient. In addition, we measured the swallowing activity by using IPG and swallowing sound. As a result, all patients is conscious of the change of swallowing sense. And we noticed the change of IPG wave and the swallowing sound occurred except Pharynx period. So patients want to be informed about the change of swallowing sense strongly before they take operation. And it is necessary for the patient to be informed about the change of swallowing before they take operation.

DOI： 10.18926/15243

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Other Link： http://search.jamas.or.jp/link/ui/2002153551

Modelling of interface construction relating to power-line interference phenomenon in biopotential signal measurement system Reviewed

Adli, Yamamoto Yoshitake, Nakamura Takao

10 ( 2 ) 107 - 115 2000

Authorship：Last author Language：English

A modelling of interface construction relating to power-line interference phenomenon was described. Source of interference was displacement currents which flowed from AC power-line configuration (APC) to a model. The interference depends on some factors: distance between the APC and a model ; length of unshielded leads ; position of the APC in vertical or horizontal direction ; and skin-electrode impedances which were balance or unbalanced. The position of APC and skin-electrode impedances were important in contributing of the interference. The interference was still large even though skin-electrode impedances were balance. This was caused by the disagreement in two displacement currents. It was overcame by adjustment of APC in vertical direction. As a result, total interference would be very small or zero. The result shows that interference in ECG signal recording can be eliminated to about 10 μV. Although interference of power-lines is a complicated phenomenon, the problem is easier to understand by using this modelling.

DOI： 10.18926/11726

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Neck electrical impedance for measurement of swallowing Reviewed

Yoshitake Yamamoto, Takao Nakamura, Yasuhiko Seki, Kinya Utsuyama, Ken Akashi, Kazuaki Jikuya

Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) 130 ( 4 ) 35 - 44 2000

上肢運動に伴う生体電気インピーダンスのパラメータ変動(共著) Reviewed

中村隆夫、山本尚武

岡山大学医学部保健学科紀要 10 ( 1 ) 15 - 22 1999.12

Studies on eliminating interference by electromagnetic induction from power line in ECG Signals(共著) Reviewed

Frontier of Medical and Biological Engineering 9 ( 3 ) 229 - 239 1999.3

Welfare Supported Engineering toward Aging Society. Neck Electrical Impedance for Measurement of Swallowing. Reviewed

電気学会論文誌 A 118-A ( 3 ) 210 - 217 1998.3

Principle of Biodynamic Analysis Using Human Limb Electrical Impedance (共著) Reviewed

NAKAMURA T, YAMAMOTO Y

Memoirs of the Faculty of Engineering, Okayama University 30 ( 1 ) 19 - 24 1995.12

Distance and velocity meter for human motion analysis Reviewed

T. Nakamura, Y. Yamamoto, T. Yamamoto, H. Tsuji

Medical & Biological Engineering & Computing 32 ( 1 ) 115 - 118 1994.1

Studies on Igniter for Torch Reviewed

YAMAMOTO Yoshihiro, INAGE Akira, NAKAMURA Takao

Research report of Takamatsu National College of Technology ( 29 ) 73 - 87 1993

New Equivalent Circuit for Electrical Impedance of Botanical Tissues. Reviewed

中村隆夫, 山本尚武, 山本辰馬, SONG Z

電子情報通信学会論文誌 D-2 75 ( 11 ) 1975 - 1977 1992

MEASUREMENT AND ANALYSIS OF RUNNING : Application of Bioelectrical Impedance and Distance-Velocity Meter Reviewed

NAKAMURA Takao, YAMAMOTO Yoshitake, YAMAMOTO Tatsuma, TSUJI Hiroaki

Biomechanisms 11 43 - 55 1992

Authorship：Lead author Language：Japanese Publisher：Society of Biomechanisms

This paper describes motion analyses during running which used distance-velocity meter and bioelectrical impedance method. The distance-velocity meter is constructed of a rotary encoder, a string of high strength and high elasticity, and a guide wire. It gives information on the distance and velocity of the runner in every running point with high precision. A lower leg electrical impedance is used in this bioelectrical impedance method. This method gives information on landing point, take-off point, ankle angle and so on during running. Impedance wave form is able to observe intuitively the motion of running and to divide the running period. Using these results, we can analyze running in relation to stride length, pitch,running speed and running form. First, the measurement system is described in terms of construction, performance and measure ment method. The accuracy of measurement in distanceis ±(0.03%+0.8cm). The accuracy of measurement in velocity of running is 1% for an average distance over 48cm. The non-linearity of impedance measurement by telemetry is ±0.5% to the extent of ±10 ohms. The measuring area is about 100m from the antenna. Next, the method of running is analyzed. Impedance wave form during running is discussed in relation to the running motion. The results show that the characteristics of various running forms appear in the wave form of lower leg impedance. The stride length is also determined with the accuracy of about 1%. Last, this method is applied for 100m and middle-distance races, and discussed. This measurement system is simple and easy to handle. Hence, it can also be used for analysis of other field and track events-hurdle races or running broad jump, for example.

DOI： 10.3951/biomechanisms.11.43

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Measurement of reaction time in agility using bio-electrical impedance. Reviewed

山本尚武, 中村隆夫, 山本辰馬, 辻博明

電子情報通信学会論文誌 D-2 74 ( 1 ) 1991

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