Attenuation of Eccentric Exercise-Induced Muscle Damage by Preconditioning Exercises
Attenuation of Eccentric Exercise-Induced Muscle Damage by Preconditioning Exercises
复制标题
DOI：
10.1249/mss.0b013e31825f69f3
复制
发表时间：
2012-11-01
期刊：
影响因子：
--
通讯作者：
Nosaka, Kazunori
中科院分区：
文献类型：
--
作者：
Chen, Trevor Chung-Ching;Chen, Hsin-Lian;Nosaka, Kazunori
陈，T. C.- C.的方法，H.- L. Chen，A. J.皮尔斯和K.野坂。预适应运动减轻离心运动引起的肌肉损伤。医学科学体育锻炼，第44卷，第11期，第111页。2090-2098年，2012年。目的：本研究比较了由低强度离心或最大等长收缩（ISO）组成的初始运动对最大离心收缩（MaxECC）引起的肌肉损伤的保护作用。方法：将未经训练的年轻男性分为5组（每组n = 13）：MaxECC、10%ECC、20%ECC、90度ISO和20度ISO。MaxECC、10%ECC和20%ECC组分别使用相当于100%、10%和20%最大随意等长收缩强度的哑铃进行30次手肘屈肌ECC。90 ° ISO和20 ° ISO组分别在肘关节屈曲90 °和20 °时进行了30次ISO。三周后，所有受试者使用用于第一回合的手臂进行30次MaxECC。通过双向重复测量方差分析比较各组之间在第一次和第二次运动前和运动后5 d的最大自愿等长收缩和向心性收缩强度、运动范围、上臂周长、血浆肌酸激酶和肌红蛋白浓度以及肌肉酸痛的变化。结果如下：与MaxECC组相比，10%ECC、20%ECC、90度ISO和20度ISO组在第一次回合后所有测量值的变化较小（P <0.05），并且10%ECC和90度ISO组的变化较小（P <0.05）。与MaxECC组第一回合相比，20%ECC组和20度ISO组第二回合后的测量变化较小，20度ISO组的保护作用明显更大，但与MaxECC组相比，这些保护作用较小（P < 0.05）。结论：这些结果表明，ECCs具有保护作用的阈值强度，长肌长ISO具有预处理作用。
CHEN, T. C.-C., H.-L. CHEN, A. J. PEARCE, and K. NOSAKA. Attenuation of Eccentric Exercise Induced Muscle Damage by Preconditioning Exercises. Med. Sci. Sports Exerc., Vol. 44, No. 11, pp. 2090-2098, 2012. Purpose: This study compared the effect of an initial exercise consisting of either low-intensity eccentric or maximal isometric contractions (ISOs) on protective effect against maximal eccentric contraction (MaxECC)-induced muscle damage. Methods: Untrained young men were placed into one of five groups (n = 13 per group): MaxECC, 10% ECC, 20% ECC, 90 degrees ISO, and 20 degrees ISO. The MaxECC, 10% ECC, and 20% ECC groups performed 30 ECCs of the elbow flexors using a dumbbell equivalent to 100%, 10%, and 20% of maximal voluntary isometric contraction strength, respectively. The 90 degrees ISO and 20 degrees ISO groups performed 30 ISOs at 90 degrees and 20 degrees of elbow flexion, respectively. Three weeks later, all subjects performed 30 MaxECCs with the arm used for the first bout. Changes in maximal voluntary isometric and concentric contraction strength, range of motion, upper arm circumference, plasma creatine kinase and myoglobin concentration, and muscle soreness before and for 5 d after the first and second exercise bouts were compared among groups by a two-way repeated-measure ANOVA. Results: Changes in all measures after the first bout were smaller (P < 0.05) for 10% ECC, 20% ECC, 90 degrees ISO, and 20 degrees ISO groups compared with MaxECC group, and the changes were smaller (P < 0.05) for 10% ECC and 90 degrees ISO than 20 degrees ISO and 20% ECC groups. When compared with the first bout of MaxECC group, changes in the measures after the second bout were smaller for 20% ECC and 20 degrees ISO groups with greater protective effect evident for 20 degrees ISO group, but the protective effect conferred by these was smaller (P < 0.05) compared with MaxECCs. Conclusion: These results suggest that there is threshold intensity for ECCs to confer protective effect, and ISOs at a long muscle length provide preconditioning effect.