Studies have suggested that older individuals are more fatigable than young adults when power loss, measured during single-joint contractions, is considered the fatigue index; however, age-related differences in fatigue considering power measurements during multi-joint movements (e.g., cycling) have not been fully elucidated yet. This study examined age-related differences in dynamic and isometric measures of fatigue in response to three cycling exercises. Ten young (27 ± 4 years) and ten old (74 ± 4 years) men performed exercises on different days, 30-s Wingate, 10-min at severe-intensity, and 90-min at moderate-intensity. Dynamic measures-maximal power, torque, and velocity-were assessed after cycling and during recovery (1-8 min post-exercise) through 7-s cycling sprints and isometric force and fatigue etiology (central and peripheral components) through isometric contractions. There were no age-related differences in the relative reduction of dynamic and isometric measures following the Wingate and moderate-intensity tasks. Maximal power, isometric force, and indices of peripheral function (e.g., high-frequency doublet) decreased more in young compared with older individuals after the severe-intensity exercise (all p < .05). The only observed age-related difference in the recovery of NM fatigue was a slower recovery of power and torque from 1 to 8 min (p < .05) and at 4 min (p = .015), respectively, in younger males after the Wingate. Age-related fatigue and recovery depend on the fatiguing exercise intensity and duration and on the fatigue assessment mode. This study provides novel information on age-related neuromuscular fatigue responses to multi-joint dynamic exercises performed at different intensities and durations.

中文翻译：

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年龄相关的神经肌肉疲劳和骑自行车后的恢复：等距和动态模式下的测量。

研究表明，将单关节收缩期间测得的力量损失视为疲劳指数时，老年人比年轻人更具易感性。但是，尚未充分阐明考虑到多关节运动（例如，骑自行车）期间进行功率测量时与年龄相关的疲劳差异。这项研究检查了对三种自行车运动的疲劳的动态和等距测量中与年龄相关的差异。十名年轻（27±4岁）和十岁（74±4岁）男子在不同的日期，30秒的Wingate，重强度的10分钟和中等强度的90分钟进行锻炼。动态测量-最大功率，扭矩，在骑车后和运动恢复期间（运动后1-8分钟）通过7 s骑车冲刺评估运动的速度，并通过等距收缩评估等距力和疲劳病因（中央和周围成分）。在Wingate和中等强度任务之后，动态和等距测度的相对减少没有年龄相关的差异。经过大强度运动后，年轻人的最大力量，等轴测力和外围功能指标（例如，高频双峰）的下降幅度要比老年人更大（所有p <.05）。在NM疲劳恢复中，唯一观察到的与年龄相关的差异是，年轻男性在运动后1至8分钟（p <.05）和4分钟（p = .015）时动力和扭矩恢复较慢。温盖特。与年龄有关的疲劳和恢复取决于疲劳的运动强度和持续时间以及疲劳评估模式。这项研究提供了与年龄相关的神经肌肉疲劳反应在不同强度和持续时间下进行的多关节动态锻炼的新颖信息。