透過肌電儀觀察肌肉疲勞之肌肉活化現象

目的：本研究目的主要探討當肌肉疲勞時肌肉活化會增加或減少，並同時透過機電延遲及平均功率頻率驗證該疲勞測試是否可以使肌肉產生疲勞。方法：本研究招募體育系學生8名（身高：175.8±5.5公分；體重：74.6±6.9公斤；年齡：21±0.6歲），受試者平日有規律運動習慣，並於半年內無下肢肌肉骨骼之傷害。本研究使用等速肌力儀進行等速肌力疲勞測試，受試者需盡最大努力以角速度60°/s實施膝關節屈曲／伸展之運動，動作至最大等長肌力測試所測得之最大力量的一半為疲勞，同步透過肌電儀擷取肌電訊號。透過相依樣本t檢定比較肌肉疲勞時機電延遲、肌肉活化情形、平均功率頻率的變化情形。顯著水準定為α=.05。結果：當肌肉疲勞時肌肉活化會減少、機電延遲會增加、平均功率頻率會降低。結論：此一結果可運用在未來肌電儀穿戴式裝置的開發，觀察肌肉活化減少可代表肌肉疲勞的產生。

關鍵字

疲勞測試；肌電儀；機電延遲；平均功率頻率

並列摘要

Purpose: The study was aimed to investigate whether muscle activation increased or attenuated when experiencing fatigue and by observing electrical mechanical delay and mean power frequency to testify whether the designed protocol could elicit muscle fatigue at the same time. Method: Eight students from physical education participated in the study(Average height: 175.8±5.5 cm; Average weight: 74.6±6.9 kg; average age: 21±0.6 years old). All participants exercise regularly, moreover, none of any of them have had lower limb injuries in the past one year. The isokinetic training machine was instrumented for the measurement of muscle fatigue; the participants were required to exert the maximum effort to reach 60°/s angle velocity doing knee flexion and extension. The fatigue was defined upon the muscle power observed fall under half of the maximal power that was measured by the electromyography. The t-test was applied to compare the electrical mechanical delay, muscle activation and mean power frequency during fatigue. The significant level was set up as α=.05. Result: The muscle activation and mean power frequency attenuated with the electrical mechanical delay increased when the muscle was experiencing fatigue. Conclusion: The result can be adopted in the development of future electromyography related wearable devices. As the observed muscle activation decreased, it's possible to say that fatigue is happening.

並列關鍵字

Fatigue test ； Electromyography ； Electromyograohic delay ； Average power frequency

國際替代計量

透過肌電儀觀察肌肉疲勞之肌肉活化現象

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