Boukhris Omar, Zghal Firas, Trabelsi Khaled, Suppiah Haresh, Ammar Achraf, Jahrami Haitham, Hsouna Hsen, Abdessalem Raouf, Glenn Jordan M, Chtourou Hamdi, Driller Matthew
SIESTA Research Group, School of Allied Health, Human Services and Sport, La Trobe University, Melbourne, Victoria, Australia.
Sport, Performance, and Nutrition Research Group, School of Allied Health, Human Services and Sport, La Trobe University, Melbourne, Victoria, Australia.
J Sleep Res. 2024 Feb;33(1):e14052. doi: 10.1111/jsr.14052. Epub 2023 Oct 6.
This study aims to investigate the impact of a 40-min nap opportunity on perceived recovery, exertion, and maximal voluntary isometric contraction (MVIC) following the 5-m shuttle run test (5SRT), after 1 night of normal sleep. In a randomised, counterbalanced, cross-over design, 17 trained men (mean [SD] age 20 [3] years, height 173 [6] cm, body mass 68 [6] kg) performed a 5SRT under two conditions: a 40-min nap opportunity and no-nap condition. After both conditions, electromyography signals during a 5-s isometric knee extension were recorded before and immediately after the 5SRT. Two electrical nerve stimulations at the femoral nerve were measured during and after the MVIC. Force, voluntary activation level, M-wave amplitudes, potentiated twitch, and electromyography signals (root mean square) were measured during each MVIC. Perceived exertion was recorded after each repetition of the test and perceived recovery was determined after the end of the MVIC. Compared to the no-nap condition, the 40-min nap resulted in significant enhancements in both the highest distance (p < 0.01, Δ = +7.6%) and total distance (p < 0.01, Δ = +7.5%). Before and after exercise, values for MVIC, root mean square, M-wave amplitudes, and voluntary activation level were improved after the 40-min nap opportunity compared to no-nap condition (all p ≤ 0.01). Values for perceived exertion and recovery were improved after the 40-min nap opportunity in comparison with no-nap condition (p ≤ 0.01). A 40-min nap opportunity improved repeated high-intensity short-term maximal performance, perceived recovery, associated neuromuscular responses, and reduced perceived fatigue. Therefore, our findings suggest that central and peripheral processes are involved in the improvements of 5SRT performance after napping.
本研究旨在探讨在正常睡眠1晚后，40分钟的午睡机会对5米往返跑测试（5SRT）后主观恢复感、运动强度和最大自主等长收缩（MVIC）的影响。在一项随机、平衡、交叉设计中，17名受过训练的男性（平均[标准差]年龄20[3]岁，身高173[6]厘米，体重68[6]千克）在两种条件下进行5SRT：有40分钟午睡机会的条件和无午睡条件。在两种条件下，分别在5SRT之前和之后立即记录5秒等长伸膝过程中的肌电图信号。在MVIC期间和之后测量股神经的两次电神经刺激。在每次MVIC期间测量力量、自主激活水平、M波振幅、强直后增强和肌电图信号（均方根）。在每次测试重复后记录主观运动强度，并在MVIC结束后确定主观恢复感。与无午睡条件相比，40分钟的午睡使最高距离（p<0.01，Δ=+7.6%）和总距离（p<0.01，Δ=+7.5%）均显著提高。与无午睡条件相比，40分钟午睡机会后，运动前和运动后的MVIC、均方根、M波振幅和自主激活水平值均有所改善（所有p≤0.01）。与无午睡条件相比，40分钟午睡机会后，主观运动强度和恢复感值有所改善（p≤0.01）。40分钟的午睡机会改善了重复高强度短期最大运动表现、主观恢复感、相关神经肌肉反应，并减轻了主观疲劳。因此，我们的研究结果表明，中枢和外周过程参与了午睡后5SRT表现的改善。
