目的：本研究的主要目的在探討延遲性肌肉酸痛 (delayed onset muscle soreness, DOMS) 後從事4天不同強度的運動（40% 和60% VO2 peak，60 rpm），對自行車運動經濟性及生理反應的影響。方法：本研究以16名大學體育相關科系男學生為受試對象（年齡：23 ± 0.5歲；身高：174.1 ± 1.3公分；體重：68.5 ± 1.5公斤；VO2 peak：44.9 ± 1.4 ml/kg/min）。受試者先以原地自行車測功儀進行最大攝氧峰值及自行車運動經濟性測驗，再將受試者隨機分派至A40組（40% VO2 peak，60 rpm，n=8）和A60組（60% VO2 peak，60 rpm，n=8）。之後進行躍下跳 (drop jump) 200次(20次×10組，組與組間休息60秒)，讓受試者股四頭肌作離心收縮運動，誘發雙腳股四頭肌延遲性肌肉酸痛。在誘發後的第2 - 5天，各組每天分別在原地自行車測功儀上進行30分鐘不同強度的自行車運動。各組在誘發DOMS前、誘發後第0-6天每天進行肌肉酸痛、最大自主收縮肌力（MVC）的測量；在誘發DOMS前、誘發後第2、4、6天抽血檢驗血液肌酸激酶（CK）、乳酸脫氫酶 (LDH) 活性及進行自行車運動經濟性測驗。所得資料以混合設計二因子變異數分析法進行統計處理，當變異數分析達到差異顯著水準時，再進一步使用杜凱氏法（Tukey’s）進行事後比較。本研究的顯著水準定為α= .05。結果：在誘發DOMS後0 -6天，A40組和A60組兩組間的MVC、肌肉酸痛恢復情形無顯著差異，只在時間因子上達顯著差異 (p<.05)。在誘發DOMS後第2、4、6天，兩組間的血液肌酸激酶（CK）、乳酸脫氫酶 (LDH) 活性及自行車運動經濟性等指標，在各時間點上均無顯著差異，只在時間因子上達顯著差異 (p<.05)。結論：1.在DOMS產生之後，以40% VO2 peak的強度或60% VO2 peak的強度運動對於最大自主收縮肌力的恢復是沒有顯著差異的。2. 在DOMS產生之後以40% VO2 peak的強度或60% VO2 peak的強度運動，對自行車運動經濟性及運動經濟性測驗中的換氣量、心跳率、血液乳酸濃度等生理反應的恢復是沒有顯著差異的。

Purpose: The purpose of this study was to investigate the effect of a 4-day different intensity of exercise (40% and 60%VO2peak, 60 rpm) after delayed onset muscle soreness (DOMS) on cycling economy and physiological responses. Methods: Sixteen male physical education students participated in this study (age: 23 ± 0.5 years; height: 174.1 ± 1.3cm; weight: 68.5 ± 1.5 kg; VO2 peak: 44.9 ± 1.4 ml/kg/min). Subjects took the VO2 peak and cycling economy test first. Then they were randomly assigned into two groups: A40 (40％VO2 peak, 60rpm, n=8 ) and A60 (60％VO2 peak, 60rpm, n=8). An exercise protocol consisting of 200 drop jumps (20 repetitions × 10 sets) was used to elicit DOMS. 30-min of cycling exercises with different intensity were performed from 2ed day to 5th day to compare muscle soreness, maximal voluntary contraction strength (MVC), creatine kinase (CK) and lactate dehydrogenase (LDH) activity and cycling economy responses after drop jump. Result: No significant difference between two groups in MVC, muscle soreness, CK, LDH activities and cycling economy (p> .05) was observed. Conclusions: 1. There is no significant difference between 40％VO2 peak and 60％VO2 peak of exercise on MVC recovery after DOMS; 2. There is no significant difference between 40％VO2 peak and 60％VO2 peak of exercise on cycling economy recovery after DOMS.

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