How long does the protective effect on eccentric exercise-induced muscle damage last?
How long does the protective effect on eccentric exercise-induced muscle damage last?
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DOI：
10.1097/00005768-200109000-00011
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发表时间：
2001-09-01
期刊：
影响因子：
--
通讯作者：
Sacco, P
中科院分区：
文献类型：
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作者：
Nosaka, K;Sakamoto, K;Sacco, P
目的：一轮离心运动产生一种适应，减少随后一轮中的肌肉损伤。由于尚不清楚这种适应持续多久，本研究调查了大力量离心运动后肌肉损伤指标衰减变化的最大长度。方法：将男学生（N = 35）分为三组，进行两次非优势肘屈肌的离心运动，间隔时间为 6（N = 14）、9（N = 11）或 12（N = 10）个月。运动前和运动后5天测量最大等长力（MIF）、运动范围（ROM）、上臂周长（CIR）、肌肉酸痛（SOR）和血浆肌酸激酶活性（CK）。运动后 4 天拍摄上臂横向和纵向扫描的磁共振 (MR) 图像。通过双向重复测量方差分析比较第一轮和第二轮之间以及组之间标准测量的变化。结果：与初始反应相比，在 6 个月或 9 个月进行第二次锻炼后，MIF 明显恢复更快，并且在 6 个月进行第二次锻炼后，SOR 降低，MR 图像的 CIR、CK 和 T2 弛豫时间也出现较小的增加。在 ROM 方面，各回合之间没有发现显着差异，并且 12 个月组没有显示任何重复的回合效应。结论：这些结果表明，大多数标准措施的重复效果至少持续 6 个月，但在 9 至 12 个月之间消失。
Purpose: One bout of eccentric exercise produces an adaptation that reduces muscle damage in subsequent bouts. Because it is not known how long this adaptation lasts, the present study investigated the maximal length of the attenuated changes in muscle damage indicators after high-force eccentric exercise, Methods: Male students (N = 35) were placed into three groups and performed two bouts of eccentric exercise of the nondominant elbow flexors separated by either 6 (N = 14), 9 (N = 11), or 12 (N = 10) months. Maximal isometric force (MIF), range of motion (ROM), upper arm circumference (CIR), muscle soreness (SOR), and plasma creatine kinase activity (CK) were measured before and for 5 d after exercise. Magnetic resonance (MR) images of the transverse and longitudinal scans of the upper arm were taken 4 d after exercise. Changes in the criterion measures were compared between the first and second bouts and between groups by a two-way repeated measures ANOVA. Results: A faster recovery in MIF was evident after a second bout performed at 6 or 9 months, and reduced SOR as well as smaller increases in CIR, CK, and T2 relaxation time of MR images also occurred after the second exercise bout at 6 months compared with initial responses. No significant differences between the bouts were found for ROM, and the 12-month group did not show any repeated bout effect. Conclusion: These results show that the repeated bout effect for most of the criterion measures lasts at least 6 months but is lost between 9 and 12 months.