本研究目的在探討不同座墊高度對下肢肌群肌肉活化與疲勞的表現。實驗參與者以8名無規律騎乘自行車習慣者、年齡介於18-25歲之間，以90%、95%及100%大轉子到地面等三種座墊高度，連續騎乘3分鐘、功率設定為200Watt、轉速為80rpm來進行實驗。研究結果顯示: 一、在第1時段（0-60秒）與第2時段（61-120秒）下，無論採用任何座墊高度在四個肌群上皆無明顯差異。在第3時段（121-180秒）下，腓腸肌在100%的座墊高度明顯高於其他兩種座墊高度；而股外側肌在95%的座墊高度明顯低於其他兩種座墊高度。二、在疲勞情況方面，腓腸肌在採用100%座墊高度的疲勞程度高於90%與95%的座墊高度，其疲勞產生的比例為100%、95%、90%的座墊高度，隨著座墊高度的降低，出現肌肉疲勞的情形也跟著減少。而在股外側肌群方面，採用95%的座墊高度除了有較好的活性外，且不易產生疲勞。三、在自我舒適檢核表方面，腓腸肌除了100%大轉子到地面高度的座墊高度，在產生疲勞時能察覺肌肉的酸痛，其餘的90%與95%在肌肉產生疲勞時皆不易自我察覺。本研究建議在95%的座墊高度能使主要作用肌群有較好的肌肉活性，並且在疲勞上也比90%與100%的座墊高度不容易產生。故建議自行車愛好者在騎乘時可選擇95%大轉子到地面的座墊高度來從事自行車運動。

The purpose of this study was to investigate the influence of different cycling seat height through electromyography (EMG) and fatigue of lower extremity during cycling. In this study, we recruited eight healthy males who had no regular riding to the bicycle (age between 18-25 years old). We tested in three different cycling seat height (90%, 95%, 100% of leg length) of bicycle riding (80 RPM, 200W) for 3 minutes. The results were as follows: 1. Regardless of any Seat height, there has no significant difference on the four muscles in the first period (0-60 sec) and second period (61-120 sec). During the third period (121-180 sec), 100% of seat height was higher than the other two of gastrocnemius. The 95% of seat height was higher than the other two seat of vastus lateralis. 2. In fatigue situation, 100% of seat height was higher than the other two of gastrocnemius. The proportion of the fatigue generated from high to low were 100%, 95%, and 90% of the seat cushion height. As the seat cushion height reduction, muscle fatigue is also reduced. As for the vastus lateralis muscle, 95% of seat height will be more activity, and less fatigue. In self-comfort checklist, the gastrocnemius of 100% of seat height can be detected in muscle soreness fatigue, but that of 90% and 95% in muscle fatigue were not easy to self-aware. The results of this study showed that 95% of seat height had better muscle efficiency, and less fatigue than that of 90% and 100% of seat height. Therefore, we will suggest that bicycle enthusiasts can choose 95% of seat height in cycling.

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