Responses of human elbow flexor muscles to electrically stimulated forced lengthening exercise.
Responses of human elbow flexor muscles to electrically stimulated forced lengthening exercise.
复制标题
人体肘屈肌对电刺激强制延长运动的反应。
DOI：
10.1046/j.1365-201x.2002.00936.x
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
P. Sacco
中科院分区：
文献类型：
--
作者：
K. Nosaka;M. Newton;P. Sacco
本研究建立了一个人体肘屈肌电刺激模型，以研究离心运动引起的肌肉损伤和适应。男学生（n=17）被随机分为两组之一;等距（ES-ISO，n=8）和偏心（ES-ECC，n=9）。手肘关节固定在90度（1.57 rad），通过放置在肌肉上的两个电极通过电子肌肉刺激器刺激手肘屈肌持续5 s，用于ES-ISO。在ES-ECC中，肌肉刺激类似于ES-ISO，但手肘关节在3 s内从肘屈曲（90度，1.57 rad）强制伸展至完全伸展位置（180度，3.14 rad）。在运动前和运动后4天评估最大自愿等长力量、运动范围、上臂周长、超声检查的肌肉厚度、肌肉酸痛、血浆肌酸激酶和天冬氨酸转氨酶活性。与ES-ISO相比，ES-ECC的所有标准测量值的变化均显着更大（P < 0.01）。这些发现证实了离心肌肉动作引起肌肉损伤，但等长收缩导致很少或没有损伤。ES-ECC组的6名受试者在第一次比赛（ECC 1）后2周重复相同的离心运动（ECC 2），并比较两次比赛之间标准测量值的变化。ECC 2后各项指标的变化均显著小于ECC 1（P < 0.01）。这些结果表明，第一离心运动产生了对肌肉损伤的保护作用，在随后的离心运动回合，这不涉及适应中枢神经系统。
This study developed an electrical stimulation model for human elbow flexors to examine eccentric exercise-induced muscle damage and adaptation. Male students (n=17) were randomly placed into one of two groups; isometric (ES-ISO, n=8) and eccentric (ES-ECC, n=9). The elbow joint was fixed at 90 degrees (1.57 rad) and the elbow flexors stimulated percutaneously by an electronic muscle stimulator for 5 s through two electrodes placed over the muscles for ES-ISO. In ES-ECC, the muscles were stimulated similarly to the ES-ISO, but the elbow joint was forcibly extended from an elbow flexed (90 degrees 1.57 rad) to a full-extended position (180 degrees, 3.14 rad) in 3 s. Maximal voluntary isometric force, range of motion, upper arm circumference, muscle thickness by ultrasonography, muscle soreness, plasma creatine kinase and aspartate aminotransferase activities were assessed before and for 4 days after exercise. ES-ECC produced significantly larger changes in all criterion measures compared with ES-ISO (P < 0.01). These findings confirmed that eccentric muscle actions induced muscle damage, but isometric contractions resulted in little or no damage. Six subjects from the ES-ECC group repeated the same eccentric exercise (ECC2) 2 weeks after the first bout (ECC1), and changes in the criterion measures were compared between the bouts. Changes in all criterion measures after ECC2 were significantly smaller than ECC1 (P < 0.01). These results suggest that the first eccentric exercise produced a protective effect against muscle damage in the subsequent eccentric exercise bout, which does not involve adaptations in the central nervous system.
DOI：
10.1139/h98-014
发表时间：
1998
期刊：
Canadian journal of applied physiology = Revue canadienne de physiologie appliquee.
影响因子：
--
作者：
Hortobagyi,T;Lambert,J;Scott,K
通讯作者：
Scott,K