Acute changes in passive stiffness of the individual hamstring muscles induced by resistance exercise: effects of contraction mode and range of motion
Acute changes in passive stiffness of the individual hamstring muscles induced by resistance exercise: effects of contraction mode and range of motion
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DOI：
10.1007/s00421-022-04976-6
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发表时间：
2022-06-14
影响因子：
3
通讯作者：
Wakahara, Taku
中科院分区：
文献类型：
--
作者：
Kawama, Raki;Yanase, Ko;Wakahara, Taku
目的 最近的研究提出了一个有趣的可能性，即抗阻运动也可以降低被动肌肉僵硬，就像伸展运动一样。然而，人们对抗阻训练的程序变量如何严重影响肌肉僵硬知之甚少。我们的目的是检查使用不同的收缩模式和运动范围 (ROM) 组合进行抗阻训练后，各个腘绳肌被动僵硬的急剧变化。方法 13 名健康年轻男性参与者在不同的日子进行了 3 次阻力练习，包括不同收缩模式和运动 ROM 的直腿硬拉，具体如下：（1）离心收缩，宽运动 ROM（EW）； (2) 运动范围狭窄的离心收缩 (EN)； (3) 具有较宽运动范围的同心收缩 (CW)。在每个训练之前以及完成之后 3 分钟、30 分钟和 60 分钟测量最大关节活动度、被动扭矩、单个腘绳肌的剪切模量以及膝关节屈曲的最大等长扭矩。结果 EW 运动中半膜肌的剪切模量 (121.8 +/- 16.0 kPa) 明显低于运动前 (129.0 +/- 18.9 kPa, p = 0.021, r = 0.45)，但 EN 或 CW 中则不然。在任何运动方案的任何时间点，股二头肌长头或半腱肌的剪切模量都没有显着变化。结论 目前的结果表明，抗阻运动期间偏心收缩和宽活动范围的结合有可能急剧降低特定肌肉的被动刚度（剪切模量）。
Purpose Recent studies raise an interesting possibility that resistance exercise also decreases passive muscle stiffness, as does stretching exercise. However, little is known about how program variables of resistance exercise acutely influence muscle stiffness. We aimed to examine the acute changes in passive stiffness of the individual hamstring muscles after resistance exercises using different combinations of contraction modes and ranges of motion (ROMs). Methods Thirteen healthy young male participants performed three sessions of resistance exercises that comprised stiff-leg deadlift with different contraction modes and exercise ROMs on separate days as follows: (1) eccentric contractions with a wide exercise ROM (EW); (2) eccentric contractions with a narrow exercise ROM (EN); and (3) concentric contractions with a wide exercise ROM (CW). Maximal joint ROM, passive torque, shear modulus of the individual hamstring muscles, and maximal isometric torque of knee flexion were measured before and 3 min, 30 min, and 60 min after completing each session. Results The shear modulus of the semimembranosus was significantly lower at 3 min post-exercise (121.8 +/- 16.0 kPa) than at pre-exercise (129.0 +/- 18.9 kPa, p = 0.021, r = 0.45) in EW, but not in EN or CW. There were no significant changes in the shear moduli of the biceps femoris long head or the semitendinosus at any timepoint in any exercise protocols. Conclusions The present results suggest that the combination of eccentric contraction and wide ROM during resistance exercise has the potential to acutely decrease passive stiffness (shear modulus) of a specific muscle.