著者

平田 栄次 塩澤 成弘

出版者

一般社団法人電子情報通信学会

雑誌

電子情報通信学会技術研究報告. MBE, MEとバイオサイバネティックス (ISSN:09135685)

巻号頁・発行日

vol.111, no.482, pp.95-100, 2012-03-07

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武道・武術においては、その文化的価値、精神性や芸術性に焦点が当てられ研究対象とされることが多いが、本研究においてはわずか数秒に完結する武術の「型」の短時間動作を主にエネルギー効率面から評価する。研究対象は居合術と呼ばれる日本刀を用いた武術の型における"抜刀"の動作であり、様々な熟練度の被験者に対し、モーションキャプチャシステム、ボディラインスキャナを用いて刀と身体を含む剛体リンクモデルを被験者固有のパラメータを用いて構築し、速度、動作時間、力学的エネルギー等により定量的な値を用いて比較した。

著者

今井 文吾 塩澤 成弘 牧川 方昭

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.44, no.1, pp.148-155, 2006 (Released:2008-02-27)

参考文献数

10

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In this study, to eliminate the motion artifacts contaminating photoplethysmograpic (PPG) signals, a clip-type earlobe photoplethysmography sensor was improved and a noise-reduction algorithm based on a multiple-regression model was examined. Motion artifacts are thought to be caused by a change in the flow of blood. We thought that such motion artifacts could be reduced considering the acceleration change during body motion. In this study, an acceleration sensor was integrated with a commercially available clip-type earlobe PPG sensor. For the first step, typical motion artifact waveforms were calculated by choosing every motion artifact waveform, arranging the peak time and averaging. In the second step, to make a multiple regression analysis between averaged acceleration and averaged motion artifact waveform, regression coefficients were calculated. Finally, an original PPG signal with motion artifact was filtered using an individually adjusted multiple regression model. In experiments, five subjects were asked to walk and run on a treadmill to verify this filtering method. Results show that our new motion artifacts reduction algorithm is proven to be effective for decreasing the influence of body motion, and the detection accuracy of the number of pulsations has improved up to 13.3%.

著者

三上 博史 坂上 友介 塩澤 成弘 牧川 方昭

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.53, no.5, pp.264-269, 2015

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Knee joint injuries frequently occur in individuals performing sport activities. Knee taping is found to reduce the burden on knee ligaments, particularly the patellar tendon. However, methods for quantitative verification of the kinetic effects of taping on the patellar tendon are limited. In this study, a measurement method using ultrasound imaging was developed to quantify the effects of knee taping on the patellar tendon, and the effects were verified in healthy subjects. The experiment was conducted under five conditions:no taping on the knee joint and taping by four different methods. To verify the differences in taping effect on the patellar tendon under five experimental conditions, we calculated the stress-strain curve from the cross-sectional area and elongation of the patellar tendon acquired using ultrasound imaging. Twelve healthy men (aged 22.6&plusmn;1.1 years) participated in the experiment. Each subject was asked to sit on a chair with the knee joint flexed at 90&deg;, extend the knee joint, and maintain the extension force for 3 s. During the last isometric contraction, the extension force was changed from 40, 80, 120, 160N to the maximum voluntary extension force of each subject. We succeeded to measure the elastic modulus of the patellar tendon under knee taping condition. The stress-strain curve under no taping condition was significantly different from all four taping conditions (<I>p</I><0.05).

著者

増田 一太 金沢 伸彦 和智 道生 宇於崎 孝 塩澤 成弘

出版者

医学書院

雑誌

臨床整形外科 (ISSN:05570433)

巻号頁・発行日

vol.52, no.6, pp.557-561, 2017-06

著者

増田 一太 大友 智 深田 直宏 梅垣 明美 南島 永衣子 塩澤 成弘

出版者

社団法人日本体育学会

雑誌

日本体育学会大会予稿集

巻号頁・発行日

no.64, 2013-08-28

著者

森 裕子 児玉 耕太 塩澤 成弘

出版者

研究・イノベーション学会

雑誌

年次学術大会講演要旨集

巻号頁・発行日

vol.32, pp.92-96, 2017-10-28

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一般講演要旨

著者

丸山 敏弘 塩澤 成弘 牧川 方昭

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.44, no.1, pp.177-183, 2006 (Released:2008-02-27)

参考文献数

11

被引用文献数

1

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Recently, much research has been done to evaluate mental stress based on heartbeat fluctuation and lower restraint, and a non-invasive ECG measurement method is been expected to be able to record the heartbeat during daily life. In this study, a new ECG measuring method that uses capacity coupled electrodes without any reference electrode is proposed. In this paper, five different settings of signal electrodes and ground connections were compared: One capacity coupled signal electrode with no ground electrode, two capacity coupled signal electrodes with no ground electrode, two capacity coupled signal electrodes with a common ground electrode on the skin, one capacity coupled signal electrode with one capacity coupled ground electrode, and two capacity coupled signal electrodes with the amplifier grounded. We also examined our new ECG measurement method under different electrical environments: in a noise-filled laboratory, outdoors with no commercial electrical power nearby, and inside a car with the engine and air conditioner operating. As a result, our new measurement method proved to be effective for obtaining ECG signals during daily life.