a Department of Exercise and Health Science , University of Taipei , Taipei City , Taiwan.
b Graduate institute of Athletics and Coaching Science , National Taiwan Sport University , Taoyuan City , Taiwan.
Res Sports Med. 2016 Jul-Sep;24(3):243-56. doi: 10.1080/15438627.2016.1202826. Epub 2016 Jul 1.
This study investigated whether maximal voluntary isometric contractions (MVIC) performed before maximal eccentric contractions (MaxEC) would attenuate muscle damage of the knee extensors. Untrained men were placed to an experimental group that performed 6 sets of 10 MVIC at 90° knee flexion 2 weeks before 6 sets of 10 MaxEC or a control group that performed MaxEC only (n = 13/group). Changes in muscle damage markers were assessed before to 5 days after each exercise. Small but significant changes in maximal voluntary concentric contraction torque, range of motion (ROM) and plasma creatine kinase (CK) activity were evident at immediately to 2 days post-MVIC (p < 0.05), but other variables (e.g. thigh girth, myoglobin concentration, B-mode echo intensity) did not change significantly. Changes in all variables after MaxEC were smaller (p < 0.05) by 45% (soreness)-67% (CK) for the experimental than the control group. These results suggest that MVIC conferred potent protective effect against MaxEC-induced muscle damage.
本研究旨在探讨在最大离心收缩（MaxEC）之前进行最大等长收缩（MVIC）是否会减轻膝关节伸肌的肌肉损伤。未经训练的男性被分为实验组和对照组，实验组在进行 6 组 10 次 90°膝关节屈曲的 MVIC 2 周前进行 6 组 10 次 MaxEC，对照组仅进行 MaxEC（每组 n = 13）。在每次运动前后评估肌肉损伤标志物的变化。MVIC 后即刻至 2 天，最大自愿向心收缩扭矩、运动范围（ROM）和血浆肌酸激酶（CK）活性均有小但显著的变化（p < 0.05），但其他变量（如大腿周长、肌红蛋白浓度、B 型超声强度）变化不明显。实验组所有变量的变化均小于对照组（p < 0.05），酸痛感降低 45%，CK 降低 67%。这些结果表明，MVIC 对 MaxEC 引起的肌肉损伤具有很强的保护作用。
