The authors explored neuromuscular fatigue in athletes with intellectual disability (AID) compared with sedentary individuals with intellectual disability (SID) and individuals with typical development. Force, voluntary activation level, potentiated resting twitch, and electromyography signals were assessed during isometric maximal voluntary contractions performed before and immediately after an isometric submaximal exhaustive contraction (15% isometric maximal voluntary contractions) and during recovery period. AID presented shorter time to task failure than SID (p < .05). The three groups presented similar isometric maximal voluntary contraction decline and recovery kinetic. Both groups with intellectual disability presented higher voluntary activation level and root mean square normalized to peak-to-peak M-wave amplitude declines (p < .05) compared with individuals with typical development. These declines were more pronounced in SID (p < .05) than in AID. The AID recovered their initial voluntary activation level later than controls, whereas SID did not. SID presented lower potentiated resting twitch decline compared with AID and controls with faster recovery (p < .05). AID presented attenuated central fatigue and accentuated peripheral fatigue compared with their sedentary counterparts, suggesting a neuromuscular profile close to that of individuals with typical development.

作者研究了智障运动员（AID）与久坐的智障运动员（SID）和典型发育个体的神经肌肉疲劳。在等距次最大力竭收缩（等距最大自愿收缩的15％）之前和之后以及恢复期间，对等距最大自发收缩进行评估，评估力量，自发激活水平，增强的静息抽搐和肌电图信号。与SID（p <.05）。三组表现出相似的等距最大自愿收缩下降和恢复动力学。 与具有典型发育状况的个体相比，两组智障者均表现出较高的自愿激活水平和均方根归一化至峰峰值M波振幅下降（p <.05）。 与AID相比，这些下降在SID中更为明显（p <.05）。AID恢复的初始自愿激活水平晚于对照组，而SID没有恢复。与AID相比，SID的潜在静息抽搐下降幅度较小，对照组的恢复更快（p <.05）。与久坐的同伴相比，AID呈现出减弱的中央疲劳和加剧的外周疲劳，这表明其神经肌肉特征与具有典型发育特征的个体的神经肌肉特征相近。