Human Performance Laboratory, School of Health Science, Western Sydney University, Penrith, Australia.
Department of Exercise Science, University of Auckland, Building 907, Newmarket, Auckland, 1023, New Zealand.
Eur J Appl Physiol. 2021 Nov;121(11):3103-3116. doi: 10.1007/s00421-021-04777-3. Epub 2021 Aug 4.
This study measured the self-reported level of fatigue, pain, and neuromuscular function of the knee extensor muscles over a three-day period that included two consecutive days of full-body resistance exercises.
10 resistance-trained men performed two consecutive days of full-body resistance exercise. Muscle activation (electromyography and voluntary activation), contractility, and presynaptic inhibition of Ia afferents (homosynaptic and GABA mediated presynaptic inhibition) for the quadriceps were examined from femoral and posterior tibial nerve stimulation.
Fatigue and pain were elevated after Day 1, and were not reduced to pre-exercise levels at the start of Day 2 (p < 0.05). Maximal voluntary torque (- 51.4 Nm, 95% CI = 12.4-90.4 Nm, p = 0.005) and rate of torque development (- 469 Nm.s, 95% CI = 109-829 Nm.s, p = 0.006) were reduced after Day 1, had recovered by Day 2, and did not change after the second training session. The maximal amplitude and rate of rise for the quadriceps twitch were reduced after both training sessions (p < 0.01), with recovery 24 h each session. The maximal amplitude and rate of early muscle activation were reduced after Day 1 (p < 0.01), but no changes were observed for voluntary activation, H-reflex size and shape, or measures of Ia presynaptic inhibition.
Resistance exercise in the presence of elevated fatigue and pain from a previous training session does not worsen recovery, or lead to significant alterations in quadriceps neuromuscular function. Reduction in muscle contractility, in the absence of declines in muscle activation, does not lead to decreased voluntary torque.
本研究在三天的时间内测量了包括连续两天全身抗阻训练在内的两个连续日的疲劳、疼痛和膝伸肌神经肌肉功能的自我报告水平。
10 名抗阻训练男性进行了连续两天的全身抗阻训练。从股神经和胫后神经刺激检查股四头肌的肌肉激活（肌电图和自愿激活）、收缩性和 Ia 传入纤维的突触前抑制（同源突触和 GABA 介导的突触前抑制）。
第 1 天之后疲劳和疼痛增加，第 2 天开始时并未恢复到运动前水平（p < 0.05）。最大自愿扭矩（-51.4 Nm，95%置信区间= 12.4-90.4 Nm，p = 0.005）和扭矩发展率（-469 Nm.s，95%置信区间= 109-829 Nm.s，p = 0.006）在第 1 天之后降低，在第 2 天恢复，在第二次训练后没有变化。股四头肌抽搐的最大幅度和上升率在两次训练后均降低（p < 0.01），每次训练后 24 小时恢复。第 1 天之后，最大幅度和早期肌肉激活率降低（p < 0.01），但自愿激活、H 反射大小和形状或 Ia 突触前抑制的测量值没有变化。
在先前训练引起的疲劳和疼痛增加的情况下进行抗阻运动不会加重恢复，也不会导致股四头肌神经肌肉功能的显著改变。肌肉收缩性降低，而肌肉激活没有降低，不会导致自愿扭矩降低。
