Viitasalo J T, Komi P V
Acta Physiol Scand. 1981 Jan;111(1):87-95. doi: 10.1111/j.1748-1716.1981.tb06709.x.
Effects of intermittent one leg isometric fatigue on maximal isometric force, force production, relaxation and blood lactate were studied using 29 male students as subjects. The relative changes of variables during fatigue and recovery were intercorrelated together with muscle structure variables, which were determined using needle biopsy technique. Maximal force decreased, force production and relaxation became slower and muscle lactate increased during fatigue. Change of maximal force, force production and lactate during fatigue as well as recovery of maximal force and lactate after fatigue were correlated significantly to muscle fiber distribution. Fatiguability of the force-time characteristics was therefore influenced by the differences in the metabolic profiles of the individual muscle fibers. However, ability to relax the muscle quickly was not observed to be dependent on muscle structure. This suggest that different fatigue mechanisms might be present in relaxation than in force production.
以29名男学生为研究对象，研究了间歇性单腿等长疲劳对最大等长肌力、力量产生、放松及血乳酸的影响。利用针吸活检技术测定肌肉结构变量，将疲劳和恢复过程中各变量的相对变化与肌肉结构变量进行相互关联分析。疲劳过程中最大肌力下降，力量产生和放松变慢，肌肉乳酸增加。疲劳过程中最大肌力、力量产生和乳酸的变化以及疲劳后最大肌力和乳酸的恢复与肌纤维分布显著相关。因此，力-时特性的疲劳性受单个肌纤维代谢特征差异的影响。然而，未观察到肌肉快速放松的能力依赖于肌肉结构。这表明，放松过程中可能存在与力量产生不同的疲劳机制。
