目的：探討自行車騎乘時四種不同握持位置於人因工程式握把與比利時式握把之下臂及手指肌肉活化差異。方法：本研究參與者成年男性20人，每位參與者重複進行兩種握把型式及四種握持位置，以隨機取樣騎乘八次，以DELSYS無線表面肌電測量儀收取慣用手伸腕肌、屈腕肌、第一骨間背側肌、第二骨間背側肌、第三骨間背側肌及第四骨間背側肌共六條肌群，踩踏節奏90±3，功率輸出達200W後平穩 15 秒，收取20秒內中段之肌電訊號，透過MVC肌電訊號標準化，以重複量數變異數分析考驗人因工程式握把和比利時式於四種握持位置及兩種踩踏分期中肌肉活化差異，以Boferronig法事後比較分析，顯著水準 α <.05。結果：在加速期即回復期中上肢肌群皆無顯著差異，而經事後比較第四骨間背側肌於人因工程式握把達顯著差異，第一骨間背側肌、第三骨間背側肌及屈腕肌於握持位置一達顯著差異，第二骨間背側肌握持位置三達顯著差異，第一骨間背側肌與第三骨間背側肌皆於人因工程式握把之位置一與比利時式握把之位置三達顯著差異。結論：不管握持何種握把型式即握持位置下，兩種踩踏分期皆不會影響肌肉活化差異。考慮握把型式下，選擇人因工程式握把以減少手部疲勞；考慮適合握持位置下，為提高騎乘速度和強度可選擇偏下把位置，進行休閒騎乘者可選擇位置一的部分，考慮綜合以上選擇下，可選擇人因工程式握把及握持位置一與位置二較可減輕上肢肌肉之負擔，以降低肌肉活化程度，建議自行車使用者騎乘前，可參考本研究結果。

Purpose: To investigate the differences in muscle activation of the arm and fingers when using four different hand positions on ergonomic handlebars and Belgian-style handlebars during cycling. Methods: Twenty adult male participants were involved in this study. Each participant cycled eight times using two types of handlebars and four hand positions, with the order of trials randomized. Muscle activity from six muscle groups in the dominant hand (extensor carpi radialis, flexor carpi radialis, first dorsal interosseous, second dorsal interosseous, third dorsal interosseous, and fourth dorsal interosseous muscles) was measured using DELSYS wireless surface electromyography (sEMG). Participants cycled at a cadence of 90 ± 3 rpm and maintained a power output of 200W for 15 seconds. sEMG data were collected for a 20-second period during the mid-point of the trial, and the muscle activity was normalized using maximum voluntary contraction (MVC). Repeated measures ANOVA was used to assess the differences in muscle activation between ergonomic and Belgian-style handlebars across the four hand positions and two cycling phases, with post-hoc comparisons analyzed using the Bonferroni method. Significance level was set at α < 0.05. Results: There were no significant differences in upper limb muscle activation during the acceleration and recovery phases. However, post-hoc comparisons showed significant differences in the fourth dorsal interosseous muscle with the ergonomic handlebar. Significant differences were also found in the first dorsal interosseous, third dorsal interosseous, and flexor carpi radialis muscles at hand position one, and in the second dorsal interosseous muscle at hand position three. Additionally, the first and third dorsal interosseous muscles showed significant differences between hand position one with the ergonomic handlebar and hand position three with the Belgian-style handlebar. Conclusion: Regardless of the type of grip or grip position, the two phases of pedaling do not affect muscle activation differences. When considering the type of grip, choosing an ergonomic grip can reduce hand fatigue. When considering a suitable grip position, selecting a lower grip position can increase riding speed and intensity, while for leisure riding, position one is more appropriate. Considering the combination of the above choices, selecting an ergonomic grip and positions one and two can reduce the burden on the upper limb muscles, thereby lowering the degree of muscle activation. It is recommended that cyclists refer to the results of this study before riding.

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