握把高度對自行車騎乘時肌群活動輪換之影響

Rotation of Muscular Activations while Cycling with Different Handle Heights

陳一郎(Yi-Lang Chen) ； 何國彰(Kuo-Chang He)

《人因工程學刊》 18卷2期 (2016/12) Pp. 93-101

https://doi.org/10.6273/JES.2016.18(02).04

摘要

本研究徵募20位男性受試者參與自行車騎乘實驗，探討在5種握把高度下騎乘20分鐘後，身體不同部位肌群活動與主觀不適評比的差異。研究結果發現，握把高度造成騎乘姿勢的差異，進而影響不同部位的肌群活動及身體各部位主觀不適評比。其中，當軀幹逐漸由前傾轉變為直立，上肢肌群(斜方肌、二頭肌)疲勞程度因而降低，取而代之的是背部肌群(背棘肌、背闊肌)的疲勞增加，亦即產生肌群活動輪換現象。至於主觀不適評比結果顯示，低的握把比高的握把產生較大的不適評比值，臀部的不適評比值則不受握把高度影響。整體而言，下彎式競速車較易造成身體局部疲勞與不適，而上彎式自行車在肌群疲勞與不適評比上，均呈現較低的身體負荷。

關鍵字

自行車 ； 握把高度 ； 肌電圖 ； 主觀不適評比

並列摘要

This study aims to investigate the rotation of muscle activations for different body sites of 20 male bicyclists while cycling under 5 handle height conditions for 20 min. The back and neck/shoulder muscle contractions, as well as subjective discomfort rating of body parts were measured at the initial and cycling after 20 min. Results show that different handle heights caused various cycling postures, therefore resulted in different muscle fatigue levels and discomfort ratings of body parts. When the trunk increasingly inclined forward from upright, back muscle groups (i.e., erector spinae and latissimus dorsi) revealed lower fatigue levels and the upper limb muscles (i.e., trapezius and biceps brachii), oppositely, revealed higher fatigue levels. Results of subjective rating also show that higher handlebar would result in more comfortable in all body parts, whereas the buttocks remained relatively higher discomfort at all 5 handlebar heights (p＞0.05). This study suggests that bicycle with higher bars were recommended when considering muscular fatigue and subjective discomfort rating than that with lower bars.

並列關鍵字

Cycling ； Handle Height ； Electromyography (EMG) ； Subjective Discomfort Rating