Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4.
Univ Savoie Mont Blanc, Laboratoire Interuniversitaire de Biologie de la Motricité, EA 7424, F-73000 Chambéry, France.
J Exp Biol. 2019 May 9;222(Pt 9):jeb197483. doi: 10.1242/jeb.197483.
Although fatigue can be defined as an exercise-related decrease in maximal power or isometric force, most studies have assessed only isometric force. The main purpose of this experiment was to compare dynamic measures of fatigue [maximal torque (), maximal velocity () and maximal power ()] with measures associated with maximal isometric force [isometric maximal voluntary contraction (IMVC) and maximal rate of force development (MRFD)] 10 s after different fatiguing exercises and during the recovery period (1-8 min after). Ten young men completed six experimental sessions (3 fatiguing exercises×2 types of fatigue measurements). The fatiguing exercises were: 30 s all-out intensity (AI), 10 min at severe intensity (SI) and 90 min at moderate intensity (MI). Relative decreased more than IMVC after AI exercise (=0.005) while the opposite was found after SI (=0.005) and MI tasks (<0.001). There was no difference between the decrease in IMVC and after the AI exercise, but IMVC decreased more than immediately following and during the recovery from the SI (=0.042) and MI exercises (<0.001). Depression of MRFD was greater than after all fatiguing exercises and during recovery (all <0.05). Despite the general definition of fatigue, isometric assessment of fatigue is not interchangeable with dynamic assessment following dynamic exercises with large muscle mass of different intensities, i.e. the results from isometric function cannot be used to estimate dynamic function and vice versa. This implies different physiological mechanisms for the various measures of fatigue.
虽然疲劳可以定义为与运动相关的最大力量或等长力的下降，但大多数研究仅评估了等长力。本实验的主要目的是比较动态疲劳测量[最大扭矩()、最大速度()和最大功率()]与与最大等长力相关的测量值[等长最大自主收缩(IMVC)和最大力发展速率(MRFD)]，在不同疲劳运动后 10 秒和恢复期间(1-8 分钟后)。10 名年轻男性完成了六个实验阶段(3 种疲劳运动×2 种疲劳测量)。疲劳运动包括：30 秒全力强度(AI)、10 分钟剧烈强度(SI)和 90 分钟中等强度(MI)。与 AI 运动后 IMVC 相比，相对 减少更多(=0.005)，而 SI(=0.005)和 MI 任务则相反(<0.001)。在 AI 运动后，IMVC 与 的减少没有差异，但 IMVC 立即在 SI(=0.042)和 MI 运动后的恢复期间减少更多。MRFD 的抑制大于所有疲劳运动后的 和恢复期间(均<0.05)。尽管有疲劳的一般定义，但等长疲劳评估不能与不同强度的大肌肉群的动态运动后的动态评估互换，即等长功能的结果不能用于估计动态功能，反之亦然。这意味着各种疲劳测量值的生理机制不同。
