| Abstract: | 目的：在於考驗「膝伸肌分別使用快速度 (fast velocity, FV) 或慢速度 (slow velocity, SV) 進行一回合最大等速離心收縮運動 (MAX) 所引起肌肉損傷反應是否FV比SV來得明顯」之假設。方法：以12名未接受過運動訓練的健康男性學生做為受試者，並以平衡次序法讓每一位受試者的左、右腿 (間隔至少2週) 各分別使用SV或FV進行一回合120秒的MAX (SV：每秒30度角速度下進行6組×5次；FV：每秒210度的角速度下進行6組×35次；每次進行離心收縮的範圍都從膝關節彎曲5度至125度之間)，以做為比較SV與FV之間對抗離心收縮引起肌肉損傷的反應情形。所有受試者均在MAX前2天、MAX後1-5天 (間隔24小時)，分別接受肌肉酸痛 (SOR)、大腿圍 (CIR)、膝關節活動範圍 (ROM)、最大等長肌力 (MVC)、血液肌酸激酶 (CK) 活性分析。以二因子重複量數變異數 (two-way ANOVA) 分析針對 FV 和 SV 之間的每個依變項進行比較。結果：FV組在進行MAX之後的所有依變項 (SOR↑、CIR↑、ROM↓、MVC↓、CK↑) 之變化程度均比SV顯著 (p<.05)。結論：本研究的結果顯示，當FV組及SV組肌肉激活時間相同 (the time under tension)，FV在進行MAX之後引起肌肉損傷的嚴重程度均比SV明顯。
Purpose: The aim of this study was to compare the response of the muscle damage on knee extensors by using one set of maximal fast (FV) or slow velocity (SV) eccentric exercise. Methods: Twleve healthy untrained male students were recruited in the study. By the counter-balance method, each subject with right and left legs of FV or SV eccentric exercise (rest interval between a set of FV or SV eccentric exercise at least two weeks ) performed a set of 120 s-1 maximal voluntary isokinetic eccentric contractions (MAX; SV: at angular velocity of 30°•s-1 for 6 sets 5 repetitions; FV: at angular velocity of 210°•s-1 for 6 sets 35 repetitions; and range of knee joint angle was set at 5° to 125°, both) in order to compare the induced muscle damage in SV and FV. Maximal muscle soreness (SOR), leg circumference (CIR) , rang of motion of knee (ROM) , maximal isometric voluntary contraction strength (MVC), plasma creatine kinase activity (CK) were measured before, immediately after, 1, 2, 3, 4 and 5 days after MAX. All data were analyzed by a two-way repeated measures ANOVA. Results: After MAX, all the variables (SOR↑, CIR↑, ROM↓, MVC↓, CK↑) of FV were more significant than SV (p<.05). Conclusion: These results suggest that, when FV and SV have the same time under tension FV would cause more muscle damage than SV after MAX in untrained subject. |
