Differences of activation pattern and damage in elbow flexor muscle after isokinetic eccentric contractions
Differences of activation pattern and damage in elbow flexor muscle after isokinetic eccentric contractions
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DOI：
10.3233/ies-150578
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发表时间：
2015-01-01
影响因子：
0.7
通讯作者：
Ochi, Eisuke
中科院分区：
文献类型：
--
作者：
Tsuchiya, Yosuke;Kikuchi, Naoki;Ochi, Eisuke
背景：离心收缩（ECC）引起的肌肉损伤和激活模式尚不完全清楚。目的：调查ECC后每块肌肉和部位的激活水平和损伤。方法：11名男性进行30次肘屈肌等速ECC。在 ECC 之前、之后、之后 1、3、5 天测量最大自主等长收缩 (MVC) 扭矩、肘关节运动范围 (ROM)、迟发性肌肉酸痛 (DOMS)、横向松弛时间 (T2) 和横截面积 (CSA)。 结果：直到 ECC 后 3 天，MVC 和 ROM 显着下降，而 DOMS 显着增加。 ECC后肱肌的CSA显着增加。肱二头肌和中、远端肱肌的 T2 在术后 (p < 0.01) 第 1 天（中；p < 0.01，远端；肱二头肌，p < 0.05，肱肌，p < 0.01）和第 3 天（中；p < 0.01，远端；肱二头肌，p < 0.05，肱肌，p < 0.01）。此外，5 天后，只有远端肱肌表现出显着增加 (p < 0.01)。结论：最大 ECC 后，肘屈肌的激活模式和肌肉损伤有所不同，具体取决于个体肌肉和记录部位。
BACKGROUND: Eccentric contractions (ECC)-induced muscle damage and activation pattern are not fully understood.OBJECTIVE: To investigate the activation level and damage in each muscle and site after ECC.METHODS: Eleven men performed 30 isokinetic ECC of the elbow flexors. Maximal voluntary isometric contraction (MVC) torque, range of motion of the elbow joint (ROM), delayed onset muscle soreness (DOMS), transverse relaxation time (T2), and cross-sectional area (CSA) were measured immediately before, immediately after, and 1, 3, 5 days after ECC.RESULTS: MVC and ROM significantly decreased while DOMS significantly increased until 3 days after ECC. The CSA of the brachialis significantly increased after ECC. The T2 in biceps brachii and middle and distal brachialis increased significantly at post (p < 0.01) day 1 (middle; p < 0.01, distal; biceps brachii, p < 0.05, brachialis, p < 0.01), and day 3 (middle; p < 0.01, distal; biceps brachii, p < 0.05, brachialis, p < 0.01). In addition, after 5 days only the distal brachialis has shown a significant increase (p < 0.01).CONCLUSIONS: Following maximal ECC the activation pattern and muscle damage differ among the elbow flexors depending upon the individual muscle and site of recording.