睡眠剥夺(SD)很普遍,会损害运动功能;然而,关于它对感知和性能可疲劳性的影响知之甚少,尤其是女性。为了检验24小时SD对这些疲劳属性的影响,九只雌性完成了20分钟的等距,持续肘关节屈曲收缩,然后恢复10分钟。通过经颅磁刺激(TMS)引起的叠加抽搐(SIT)评估了脊柱上驱动。肱二头肌肌电图数据表明神经兴奋性响应于运动皮层的刺激(运动诱发电位;MEP),皮质脊髓束(颈髓质运动诱发电位;CMEP),和臂丛神经(最大M波;Mmax)。在TMS诱导的沉默期记录MEP和CMEP。在基线,感知努力的评级(RPE;2.9与1.6)和疲劳(RPF;6.9vs.2.9),SD高于对照。在20分钟的收缩中,RPE从2.2增加到7.6,SIT和MEP/CMEP增加了284和474%,分别,而最大自愿性等距收缩(MVC)扭矩和CMEP/Mmax下降了26%和57%,分别。在MVC的不同条件下没有发现差异,坐下,Mmax,CMEP/Mmax,或MEP/CMEP之前,during,在疲劳任务之后。在恢复期间,RPE(4.9与3.4),RPF(7.6vs.2.8),和对任务难度的感知(5.5vs.4.5)的SD大于对照。急性SD似乎不会改变性能疲劳性发展和随后的恢复;然而,它增加了疲劳的感觉,努力,和任务难度。因此,在持续的神经肌肉能力之后,感知到的和实际的神经肌肉能力之间的脱节,SD加剧了次最大等距任务。强调睡眠剥夺在20分钟亚最大肘关节屈曲收缩期间和之后不会改变脊柱上驱动或神经兴奋性睡眠剥夺会增加感知疲劳和对任务困难的感知在睡眠剥夺状态下,感知疲劳和表现疲劳之间的脱节会加剧。
Sleep deprivation (SD) is prevalent and impairs motor function; however, little is known about its effect on perceived and performance fatigability, especially in females. To examine the effects of 24 h of SD on these attributes of fatigue, nine females completed a 20-min isometric, sustained elbow flexion contraction, followed by 10 min of recovery. The superimposed twitch (SIT) elicited via transcranial magnetic stimulation (TMS) assessed supraspinal drive. Biceps brachii electromyographic data indicated neural excitability in response to stimulation over the motor cortex (motor evoked potential; MEP), corticospinal tract (cervicomedullary motor evoked potential; CMEP), and brachial plexus (maximal M-wave; Mmax). MEPs and CMEPs were recorded during a TMS-induced silent period. At baseline, ratings of perceived effort (RPE; 2.9 vs. 1.6) and fatigue (RPF; 6.9 vs. 2.9), were higher for SD than control. Across the 20-min contraction, RPE increased from 2.2 to 7.6, SIT and MEP/CMEP increased by 284 and 474%, respectively, whereas maximal voluntary isometric contraction (MVC) torque and CMEP/Mmax decreased by 26 and 57%, respectively. No differences were found across conditions for MVC, SIT, Mmax, CMEP/Mmax, or MEP/CMEP prior to, during, and after the fatiguing task. During recovery, RPE (4.9 vs. 3.4), RPF (7.6 vs. 2.8), and perception of task difficulty (5.5 vs. 4.5) were greater for SD than control. Acute SD does not appear to alter performance fatigability development and subsequent recovery; however, it increases perceptions of fatigue, effort, and task difficulty. Thus, the disconnect between perceived and actual neuromuscular capacity following a sustained, submaximal isometric task is exacerbated by SD.HighlightsSleep deprivation did not alter supraspinal drive or neural excitability during and after a 20-min submaximal elbow flexion contractionSleep deprivation increased perceived fatigue and perception of task difficultyThe disconnect between perceived and performance fatigability is exacerbated in a sleep-deprived state.