Regueme S C, Barthèlemy J, Nicol C
Department of Biology of Physical Activity, University of the Mediterranean, Marseilles, France.
Scand J Med Sci Sports. 2007 Oct;17(5):547-55. doi: 10.1111/j.1600-0838.2006.00614.x. Epub 2007 Feb 19.
Minor cross-over effects of unilateral muscle fatigue have been reported after isometric exercises. The present study re-examined this possibility after an exhaustive stretch-shortening cycle (SSC)-type exercise. Twenty-five subjects performed on a sledge apparatus a unilateral exhaustive rebound exercise involving mostly the triceps surae muscle group. Ipsilateral vs contralateral fatigue effects were compared in uni- and bilateral tests that included a maximal isometric voluntary contraction (MVC) and a series of 10 maximal drop jumps (DJ). These tests were carried out just before and after (POST) the exhaustive SSC exercise, and were repeated 2 days later (D2), at the expected time of major inflammation and pain. The exercised (fatigued) leg analysis revealed significant declines in MVC and DJ performances at POST and D2, the latter ones being associated with significant decreases in voluntary muscle activity. In contrast, no significant change was found for the non-fatigued leg. These results do not support the existence of cross-over effects after exhaustive SSC exercise, at least when tested in maximal static and dynamic unilateral motor tasks.
等长运动后曾有报道称存在单侧肌肉疲劳的轻微交叉效应。本研究在进行力竭性的拉长-缩短周期（SSC）式运动后，重新审视了这种可能性。25名受试者在雪橇装置上进行了单侧力竭性反弹运动，主要涉及小腿三头肌群。在包括最大等长自主收缩（MVC）和一系列10次最大垂直跳（DJ）的单侧和双侧测试中，比较了同侧与对侧疲劳效应。这些测试在力竭性SSC运动之前和之后（POST）进行，并在2天后（D2）重复进行，此时处于预期的主要炎症和疼痛期。对运动（疲劳）腿的分析显示，在POST和D2时MVC和DJ表现显著下降，后者与自主肌肉活动的显著降低相关。相比之下，未疲劳腿未发现显著变化。这些结果不支持力竭性SSC运动后存在交叉效应，至少在最大静态和动态单侧运动任务测试中是如此。
