Zabihhosseinian Mahboobeh, Yielder Paul, Wise Rufeyda, Holmes Michael, Murphy Bernadette
Faculty of Health Sciences, University of Ontario Institute of Technology, 2000 Simcoe St. North, Oshawa, ON L1G 0C5, Canada.
Department of Kinesiology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON L2S 3A1, Canada.
Brain Sci. 2021 Nov 9;11(11):1481. doi: 10.3390/brainsci11111481.
Even on pain free days, recurrent neck pain alters sensorimotor integration (SMI) measured via somatosensory evoked potentials (SEPs). Neck muscle fatigue decreases upper limb proprioception, and thus may interfere with upper limb motor task acquisition and SMI. This study aimed to determine the effect of cervical extensor muscle (CEM) fatigue on upper limb motor acquisition and retention; and SMI, measured via early SEPs. Twenty-four healthy right-handed individuals were randomly assigned to control or CEM fatigue. Baseline SEPs were elicited via median nerve stimulation at the wrist. Participants then lay prone on a padded table. The fatigue group supported a 2 kg weight until they could no longer maintain the position. The control group rested their neck in neutral for 5 min. Participants completed pre- and post-motor skill acquisition while seated, SEPs were again collected. Task retention was measured 24 h later. Accuracy improved post acquisition and at retention for both groups ( < 0.001), with controls outperforming the fatigue group ( < 0.05). The fatigue group had significantly greater increases in the N24 ( = 0.017) and N30 ( = 0.007) SEP peaks. CEM fatigue impaired upper limb motor learning outcomes in conjunction with differential changes in SEP peak amplitudes related to SMI.
即使在无痛的日子里，复发性颈部疼痛也会改变通过体感诱发电位（SEP）测量的感觉运动整合（SMI）。颈部肌肉疲劳会降低上肢本体感觉，从而可能干扰上肢运动任务的习得和SMI。本研究旨在确定颈伸肌（CEM）疲劳对上肢运动习得和保持的影响；以及通过早期SEP测量的SMI。24名健康的右利手个体被随机分配到对照组或CEM疲劳组。通过腕部正中神经刺激引出基线SEP。然后参与者俯卧在有衬垫的桌子上。疲劳组支撑2公斤重物，直到他们无法再保持该姿势。对照组将颈部保持中立位休息5分钟。参与者在坐位时完成运动技能习得前后的测试，再次收集SEP。24小时后测量任务保持情况。两组在习得后和保持时的准确性均有所提高（<0.001），对照组的表现优于疲劳组（<0.05）。疲劳组的N24（=0.017）和N30（=0.007）SEP波峰增加显著。CEM疲劳会损害上肢运动学习结果，并伴有与SMI相关的SEP波峰幅度差异变化。
