目的：探討動作速度流失率達20%即停止的速度依循高強度阻力運動對運動後之血液肌酸激酶(CK) 活性、肌肉痠痛之視覺類比量表 (VAS) 分數、關節活動角度 (ROM) 與推動槓鈴速度為每秒1公尺的負荷重量 (V1 load) 之動作速度等運動誘發肌肉損傷 (EIMD) 指標之影響。方法：十二位大專男性柔道運動員採交叉、平衡次序的方式，執行3組、負荷為85% 1-RM、反覆至動作速度流失率達20%即停止(VL20)與反覆至力竭 (RF) 的臥推與深蹲運動；於運動前、運動後立即、運動後24與48小時量測各項EIMD指標，並紀錄運動執行情形。所測得數據以相依樣本t檢定及重複量數二因子變異數分析比較各項數值之差異。結果：VL20試驗執行第3組深蹲之動作速度流失率顯著低於RF試驗，並在運動後24小時之CK 活性即與運動前無顯著差異，而RF試驗在運動後24小時之CK 活性仍顯著高於運動後48小時；且VL20試驗在運動後各時間點的VAS分數皆顯著低於RF試驗、運動後24小時臥推V1 load之速度顯著高於RF試驗。結論：執行3組、85% 1-RM、控制動作速度流失率為20%的高強度阻力運動時，在執行深蹲後段會有較小的動作速度流失率，且在運動後立即至運動後48小時都有較低的痠痛感覺；即此方式能降低運動誘發肌肉損傷與加速運動後的恢復。

Purpose: To investigate the effect of velocity-based heavy resistance exercise with 20% velocity loss on plasma creatine kinase (CK) activity, visual analog scale (VAS) of muscle soreness, range of motion (ROM), and against velocity 1 m/s load (V1 load), which are commonly used as the indicators of exercise-induced muscle damage (EIMD). Methods: Twelve male collegiate judokas were recruited. Participants performed 3 sets of heavy resistance exercises including bench press and squat at 85% of 1-RM, with repetitions to 20% velocity loss (VL20) or failure (RF) in a counterbalanced crossover manner. The variables of EIMD and exercise load were measured at the time points of before exercise, immediately after exercise, 24 and 48 hr after exercise. Paired t-test and two-way ANOVA with repeated measurement were used to analyze the variables. Results: The velocity loss of the third set of squats in the VL20 trial was significantly lower than the RF trial. The CK activity at time point of 24 hr after exercise in the VL20 trial did not show significant difference compared to before exercise. However, the CK activity at time point of 24-hr after exercise in the RF trial was significantly higher than 48-hr after exercise. The VAS scores at each time point after exercise in the VL20 trial were significantly lower than the RF trial. Moreover, the velocity against the V1 load in bench press at 24-hr after exercise in the VL20 trial was significantly higher than the RF trail. Conclusion: Execution of the repetition to 20% velocity loss during heavy resistance exercise for 3 sets at 85% of 1-RM enabled lower velocity loss in squat and decreased muscle pain after exercise. Thus, it can reduce exercise-induced muscle damage and speed up recovery after resistance training.