目的：探討自行車坐姿姿勢及站立姿勢騎乘於四種不同握持位置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騎乘姿勢及四種握持位置，以平衡次序法共騎乘八次，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秒肌電訊號，透過 MVC 肌電訊號標準化，以重複量數變異數分析個別考驗坐姿騎乘和站姿騎乘於四種握持位置肌肉活化差異，以杜凱氏事後比較分析，另相依樣本t檢定比較四種握持位置坐姿騎乘相對於站姿騎乘肢肌肉活化差異，顯著水準α < .05。結果：經事後比較，坐姿騎乘於上把握持伸腕肌及屈腕肌達顯著差異，下把握持於第一骨間背側肌達顯著差異，站姿騎乘於上把握持之第三骨間背側肌達顯著差異，經t檢定結果，坐姿騎乘與站姿騎乘於四種握持位置伸腕肌、屈腕肌、第一骨間背側肌及第二骨間背側肌皆達顯著差異。結論：坐姿騎乘於上把握持有較高肌肉負荷，其餘三種握持皆較優，於下把握持第一骨間背側肌有較高活化，站姿騎乘在煞變把、下把與下彎把握持第三骨間背側肌活化較高，站姿騎乘相較於坐姿騎乘伸腕肌、屈腕肌、第一骨間背側肌及第二骨間背側肌活化較高，建議自行車使用者騎乘前，參考本研究結果。

Purpose: To investigate the differences in muscle activation in the arms and fingers of cyclists riding in four different grip positions in the seated and standing positions. Method: Twenty adult males participated in this study. Each participant repeated two cycling postures and four holding positions and rode eight times with the balanced sequence method. Six muscle groups, namely, wrist extensor, wrist flexor, first interosseous dorsal, second interosseous dorsal, third interosseous dorsal, and fourth interosseous dorsal were collected from the habitual hand using DELSYS wireless surface electromyography. The signal was collected for 20 seconds after stabilizing for 15 seconds at 200 W power output. After stabilizing for 15 seconds at 200 W output, a 20-second myoelectric signal was collected, and muscle activation differences between seated riders and standing riders in the four grip positions were examined by MVC myoelectric signal standardization with dependent samples of repeated measures, analyzed by Tukey HSD, and dependent samples of t-tests to compare muscle activation differences between seated riders and standing riders in the four grip positions, with a significance level of α < .05. Result: After post hoc comparisons, seated riders achieved significant differences in the extensor carpi ulnar and flexor carpi ulnar muscles in the upper grip, in the dorsal paraspinal muscles of the first interosseous muscle in the lower grip, and in the dorsal paraspinal muscles of the third interosseous muscle in the upper grip in the standing position. The t-test results showed that seated riders achieved significant differences in the extensor carpi ulnar, flexor carpi ulnar, dorsal paraspinal muscles of the first interosseous muscle, and dorsal paraspinal muscles of the second interosseous bone in all four gripping positions compared with standing riders. Conclusion: In seated riding, the muscle load was higher in the upper grip and better in the other three grips, the activation of the first interosseous dorsalis muscle was higher in the lower grip, the activation of the third interosseous dorsalis muscle was higher in the brake lever, the lower handlebar, and the downward bending grip in standing riding, and the activation of the extensor carpi radialis brevis, flexor carpi radialis brevis, first interosseous dorsalis muscle, and second interosseous dorsalis muscle was higher in standing riding compared to seated riding, and the results are recommended that bicyclists refer to the results of the present study when they are riding. The results of this study are summarized in the following table.

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