著者

島崎 拓則 原 晋介 奥畑 宏之 中村 肇 河端 隆志

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.54, no.5, pp.225-235, 2016-10-10 (Released:2017-01-14)

参考文献数

23

被引用文献数

2

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Monitoring heart rate (HR) during exercise can be used not only for early detection of a change in physical condition but also as an indication of the exercise training condition. Photoplethysmography (PPG) is a simple and non-invasive method for HR sensing, but its use during exercise is difficult, since the PPG output is contaminated with motion artifact (MA). Especially for vigorous exercise, MA has the same frequency component as that of blood volume pulses (BVPs) in the PPG output, and no linear MA cancellation technique such as band pass filtering (BPF) can work effectively. This paper proposes a PPG-based MA canceling HR sensor. It is equipped with two sensors ; one is a normal PPG sensor with a light emitting diode (LED)/photo detector (PD) that contacts the skin to detect BVPs andMA, andthe other is an MA sensor with a LED/PD that does not contact the skin to detect only MA. Applying the outputs from the two sensors to an adaptive filter, the BVPs can be obtained easily. We evaluated the performance of the proposed HR sensor in ten subjects who performeda series of resting, walking, running andjumping. The results revealedthat the proposedHR sensor, together with an outlier rejection method, achieved root mean square errors (RMSEs) of 7.1 bpm, 6.4 bpm and6.1 bpm for walking, running andjumping, respectively, when using a Holter monitor as the reference. These results imply a reduction of RMSE by a maximum of 83% compared to no MA cancellation.

著者

河端 隆志 小田 伸午

出版者

関西大学

雑誌

基盤研究(C)

巻号頁・発行日

2016-04-01

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スポーツ時の精神的・身体的疲労が視覚情報-認知・運動制御能及び身体的行動体力の機能別に及ぼす影響について検討した。その結果、身体的行動体力の機能に及ぼす影響は高強度間歇的運動前後でVO2maxに13%の低下、サイドステップ及び前後方向ステップ動作に疲労の影響が強く現れた。また、・運動時視覚認知-運動制御系に及ぼす影響では、20分間運動時の認知―運動制御テストにおいて正答率は安静時に比べ各運動時テストにおいて増加したが、運動時テスト2回目と3回目では、正答率が低下、無回答率も低下し、平均正答時間は安静時に比べ1回目に短縮するが2回目及び3回目では正答までに時間を長く要する結果となった。