Contralateral Repeated Bout Effect of Eccentric Exercise of the Elbow Flexors
Contralateral Repeated Bout Effect of Eccentric Exercise of the Elbow Flexors
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DOI：
10.1249/mss.0000000000000991
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发表时间：
2016-10-01
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影响因子：
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通讯作者：
Nosaka, Kazunori
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作者：
Chen, Trevor C.;Chen, Hsin-Lian;Nosaka, Kazunori
Purpose本研究比较了重复回合效应（RBE）的大小为不同的时间间隔之间的两个回合的手肘屈肌离心运动，以更好地了解对侧RBE（CL-RBE）。方法未经训练的年轻男子（22.0 - 1.8年）被分配到一个控制或CL-RBE组（n = 13每组）。CL-RBE组进行30次最大等速运动，分别于术后0.5h、6 h、12 h、24 h（1d）、7 d（1 wk）、28 d（4 wk）、28 d（1 wk）、28 d（1 wk）、28 d对照组用非优势臂进行ECC 1和ECC 2，间隔2 wk。结果运动组的最大自主向心收缩力矩、峰值力矩角、运动范围、上臂围、肌肉酸痛、超声回声强度、血浆肌酸激酶活性和肌红蛋白浓度在ECC 1后有显著性变化（P < 0.05），各组间无显著性差异。ECC 2后各变量的变化在对照组、1d组、1 wk组和4 wk组均小于ECC 1后的变化（P < 0.05），表明存在RBE。然而，ECC 1和ECC 2在0.5 h、6 h、12 h和8 wk组之间的变化无显著差异。ECC 1和ECC 2之间所有变量变化的差异在第1天（70%）、第1周（55%）和第4周（36%）均小于对照组（91%），CL-RBE的幅度随着发作间隔时间的增加而降低，从1d到4 wk结论CL-RBE持续时间短于同侧RBE（>8 wk），需1天左右。
Purpose This study compared the magnitude of the repeated bout effect (RBE) for different time intervals between two bouts of eccentric exercise of the elbow flexors to better understand the contralateral RBE (CL-RBE).Methods Untrained young men (22.0 1.8 yr) were allocated to either a control or one of seven CL-RBE groups (n = 13 per group). The CL-RBE groups performed exercise consisting of 30 maximal isokinetic (30 degrees s(-1)) eccentric contractions of the elbow flexors (ECC1) with either dominant or nondominant arm followed 0.5 h, 6 h, 12 h, 24 h (1 d), 7 d (1 wk), 28 d (4 wk), or 56 d (8 wk) by the same exercise (ECC2) using the opposite arm. The control group used the nondominant arm for ECC1 and ECC2 separated by 2 wk.Results Maximal voluntary concentric contraction torque, peak torque angle, range of motion, upper arm circumference, muscle soreness, ultrasound echo intensity, and plasma creatine kinase activity and myoglobin concentration changed (P < 0.05) after ECC1, without significant difference among the groups. Changes in all variables after ECC2 were smaller (P < 0.05) than those after ECC1 for the control, 1 d, 1 wk, and 4 wk groups, indicating the RBE. However, the changes were not significantly different between ECC1 and ECC2 for the 0.5 h, 6 h, 12 h, and 8 wk groups. The difference in the changes in all variables between ECC1 and ECC2 was smaller for the 1 d (70%), 1 wk (55%), and 4 wk (36%) than the control group (91%), and the magnitude of the CL-RBE was reduced with increasing the time between bouts from 1 d to 4 wk (P < 0.05).Conclusion These results suggest that the CL-RBE lasts shorter than the ipsilateral RBE (>8 wk) and requires a day to be conferred.