Nosaka Kazunori, Newton Michael J, Sacco Paul
School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Joondalup, WA 6027, Australia.
Can J Appl Physiol. 2005 Oct;30(5):529-42. doi: 10.1139/h05-139.
A single bout of eccentric exercise confers a long-lasting protective effect against subsequent bouts of the same exercise. This study investigated how the protective effect was lessened when the interval between the initial and secondary exercise bouts was increased from 4 to 12 weeks. Thirty young men performed two bouts of 12 maximal eccentric actions of the elbow flexors of the nondominant arm separated by either 4 (n = 9), 8 (n = 10), or 12 (n = 11) weeks. Maximal isometric strength, flexed and relaxed elbow joint angles, range of motion, upper arm circumference, muscle soreness, plasma creatine kinase (CK), and myoglobin (Mb) were measured before, immediately after, and for 4 days after exercise. Changes in criterion measures were compared between bouts for each group and among groups by two-way repeated-measures ANOVA. There were no significant differences among groups in the changes in all measures following the first bout. Significantly (p < 0.05) smaller responses in all measures were observed after the second bout as compared with first bout for the 4 and 8 weeks, but only in strength, muscle soreness, CK, and Mb for the 12 weeks. It was concluded that some aspects of the protective effect were attenuated after 8 weeks, and the factors responsible for the effect vary among the measures.
单次离心运动可对随后的同类型运动产生持久的保护作用。本研究调查了当初始运动和二次运动之间的间隔从4周增加到12周时，这种保护作用是如何减弱的。30名年轻男性进行了两次非优势手臂肘屈肌的12次最大离心动作，两次运动间隔分别为4周（n = 9）、8周（n = 10）或12周（n = 11）。在运动前、运动后即刻以及运动后4天测量最大等长力量、屈肘和伸肘关节角度、活动范围、上臂围、肌肉酸痛、血浆肌酸激酶（CK）和肌红蛋白（Mb）。通过双向重复测量方差分析比较每组两次运动之间以及各组之间标准测量指标的变化。第一次运动后，所有测量指标的变化在各组之间均无显著差异。与第一次运动相比，4周和8周组在第二次运动后所有测量指标的反应均显著（p < 0.05）减小，但12周组仅在力量、肌肉酸痛、CK和Mb方面有减小。研究得出结论，8周后保护作用的某些方面减弱，且导致该作用的因素在不同测量指标中有所不同。
