以超音波影像及動作捕捉攝影系統驗證壓電肌肉感應貼布之可靠度

Abstract

本論文旨在驗證壓電肌肉感應貼布之量測機制的可靠度，其量測方式為藉由貼附於人體表面，量測肌肉收縮所引起之皮膚形變，是一種非侵入式的量測方式。為驗證壓電肌肉感應貼布量測到的數據可代表肌肉作動行為，本研究利用超音波影像以及運動追蹤系統設計三種實驗來驗證肌肉感應貼布量測機制的可靠度。第一項實驗進行一種由前臂肌肉-屈指淺肌所主導之握力動作，利用壓電肌肉感應貼布與超音波影像同時量測屈指淺肌的施力收縮情形，比較壓電肌肉感應貼布所量測到人體皮膚表面因肌肉收縮所造成的機械形變與超音波影像所觀測到的肌肉收縮行為，透過本研究所開發之影像分析演算法，探討其間之相關性，實驗結果證明在時域上，其相關係數r於20位受試者上有16位達0.7以上，且頻率域上的兩個峰值相關係數為0.9998及0.9930。另外兩項為觀測肱二頭肌所主導之動作，利用動作捕捉系統與壓電肌肉感應貼布同時量測，以進行比較及驗證。本研究先探討等長收縮之靜態疲勞實驗，驗證壓電肌肉感應貼布具有監測肌肉疲勞時所產生之震顫行為，透過紅外線攝像機以100Hz取樣頻率來捕捉貼附於肱二頭肌之三顆反射標記的三維坐標，計算肌肉收縮的相對位置與時間的關係曲線，與壓電肌肉感應貼布訊號進行分析比較。本研究並探討肱二頭肌動態等張收縮實驗，同樣利用紅外線攝像機動作捕捉技術，驗證皮膚表面受到肌肉收縮所導致之形變與壓電肌肉感應貼布訊號之間的關係曲線。實驗結果顯示兩種量測方式的中位頻率相關係數r為0.7226。第三項實驗結果的相關係數r為1。以上三組實驗結果證明壓電肌肉感應貼布具有極高之監測肌肉作動行為之可靠度，可作為個人體能提升及運動員技巧提升之個人化穿戴裝置。

This paper aims to verify the reliability of using the piezoelectric muscle patch sensor(MPS) to monitor muscle activities. It is a non-invasive sensor that attaches to the skin of a muscle to measure the skin deformation induced by muscle contraction. To verify measuring mechanism of the MPS, ultrasound imaging and motion tracking system are used, and three experiments are conducted. The first experiment compares the grip force of a forearm muscle-flexor superficial muscles (FDS), both MPS and ultrasound imaging are used at the same time. An imaging analysis algorithm is developed to explore the correlation between muscle contraction and MPS signals. Experimental results show that time-domain correlation r is larger than 0.7 for 16 out of 20 subjects, and the two primary peaks in the frequency domain correlation were 0.9996 and 0.9959. The other two experiments use a motion tracker system to verify MPS signals. In the fatigue experiment of the isometric contraction, it was verified that the MPS can monitor the tremor behavior generated by muscle fatigue. Experimental results demonstrate that the median frequency of the two data is correlated in the frequency domain. The correlation coefficient r is 0.7226. For the dynamic isotonic contraction of the biceps, the correlation coefficient r is 1 in the frequency domain. Based on experimental studies, it is verified that the MPS has a high reliability. It can be a reliable personalized wearable device for athlete personalized training.