This study investigated associations of fatigue resistance determined by an exercise-induced decrease in neuromuscular power with prefatigue neuromuscular strength and power of the knee extensors in 31 older men (65–88 years). A fatigue task consisted of 50 consecutive maximal effort isotonic knee extensions (resistance: 20% of prefatigue isometric maximal voluntary contraction torque) over a 70° range of motion. The average of the peak power values calculated from the 46th to 50th contractions during the fatigue task was normalized to the prefatigue peak power value, which was defined as neuromuscular fatigue resistance. Neuromuscular fatigue resistance was negatively associated with prefatigue maximal power output (r = −.530) but not with prefatigue maximal voluntary contraction torque (r = −.252). This result highlights a trade-off between prefatigue maximal power output and neuromuscular fatigue resistance, implying that an improvement in maximal power output might have a negative impact on neuromuscular fatigue resistance.

这项研究调查了 31 名老年男性（65-88 岁）中由运动引起的神经肌肉力量下降决定的疲劳抵抗力与疲劳前神经肌肉力量和膝伸肌力量之间的关联。一项疲劳任务包括在 70° 的运动范围内连续 50 次最大努力等张膝关节伸展（阻力：疲劳前等距最大自主收缩扭矩的 20%）。疲劳任务期间从第 46 次到第 50 次收缩计算的峰值功率值的平均值被归一化为疲劳前峰值功率值，其被定义为神经肌肉抗疲劳性。神经肌肉抗疲劳性与疲劳前最大输出功率呈负相关 ( r  = −.530)，但与疲劳前最大自主收缩力矩无关 ( r = −.252)。这一结果突出了疲劳前最大功率输出与神经肌肉抗疲劳性之间的权衡，暗示最大功率输出的改善可能对神经肌肉抗疲劳性产生负面影响。