目的：一、探討騎乘自行車經過凸起路面與平順路面時，上肢肌群活化程度之差異。二、探討騎乘自行車遇到障礙物前上肢肌群是否產生預先活化機制。透過上述目的，了解人體在騎乘自行車時，肌群是如何運作來保持身體平衡、避免跌倒及傷害。方法：利用Delsys無線肌電收取肌肉活化之相關參數，將Delsys貼至慣用側與非慣用側上肢伸腕肌、屈腕肌、肱二頭肌與肱三頭肌。在兩種不同路面（平順路面與凸起路面），將踩踏頻率訂定為50 rpm，騎乘距離為40公尺，全程收取肌肉活化之相關參數。預先活化機制時間點定為接觸障礙物前0.5秒，透過相同路面之騎乘，擷取預先活化相關參數。結果：一、騎乘經過平順路面及凸起路面對自行車騎乘者上肢肌肉的肌肉活化達顯著差異。二、騎乘者在經過凸起路面前產生肌肉預先活化。結論：一、騎乘自行車時，騎乘者會改變姿勢、改變肌肉用力程度來保持平衡、適應不同路面。本研究結果顯示，在其經過凸起路面狀況下，慣用側與非慣用側兩側伸腕肌、屈腕肌以及肱二頭肌活化程度達顯著差異。騎乘經過凸起路面時，以腕部肌肉(伸腕肌、屈腕肌)為主要作用肌群。二、自行車騎乘者在遭遇到凸起路面時，在與障礙物接觸前，肌肉已產生預先活化，以調整肌肉適應環境、與環境產生互動，避免受傷。遭遇到障礙物前，騎乘者慣用側的伸腕肌、屈腕肌以及肱二頭肌產生預先活化，以順利與環境互動，穩定車身以及避免意外發生。

Purpose: 1. Study the difference between cycling on uneven and smooth roads in terms of the degree of activation of upper limb muscles. 2. Study if there is a pre-activation mechanism in upper limb muscles before contact with obstacle while cycling. Through the above purposes, to understand the body in riding a bike, the muscles are how to maintain the body balance, to avoid falling and injury. Methods: Delsys wireless, which were attached to affixed to wrist muscle, flexor carpi, biceps, and triceps of the upper limbs, were utilized to collect the parameters of muscle activation. The pre-activation mechanism time point is 0.5 seconds before contact with obstacle. The parameters were collected during a controlled cycling process with a fixed pedaling frequency: 50 rpm and travel distance: 40 m. Results: 1. There is a significant difference between cycling on the uneven and smooth roads in terms of upper limb muscle activation. 2. There will be muscle pre-activated process before hitting obstacles. Conclusion: 1. To maintain the balance on different pavement conditions, rider will adjust the cycling position and the output on different muscles. The results of this study show that there is a significant difference in the degree of activation of the wrist muscle, flexor wrist and brachial biceps on both sides of the conventional and non-conventional sides. The wrist muscles play the main roles of muscle groups when cycling on the uneven road. 2. Before contact the obstacles, there will be a pre-activation mechanism for rider to adapt to the environment and adjustment of muscles to avoid injury. Before the obstacle, the rider's wrist, flexor wrist and brachial biceps arose pre-activation to interact with the environment, stabilize the body, and avoid accidents.

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