Background Whole body vibrations have been used as an exercise modality or as a tool to study neuromuscular integration. There is increasing evidence that longer WBV exposures (up to 10 minutes) induce an acute impairment in neuromuscular function. However, the magnitude and origin of WBV induced fatigue is poorly understood. Purpose The study aimed to investigate the magnitude and origin of neuromuscular fatigue induced by half-squat long-exposure whole-body vibration intervention (WBV) with sets of different duration and compare it to non-vibration (SHAM) conditions. Methods Ten young, recreationally trained adults participated in six fatiguing trials, each consisting of maintaining a squatting position for several sets of the duration of 30, 60 or 180 seconds. The static squatting was superimposed with vibrations (WBV30, WBV60, WBV180) or without vibrations (SHAM30, SHAM60, SHAM180) for a total exercise exposure of 9-minutes in each trial. Maximum voluntary contraction (MVC), level of voluntary activation (%VA), low- (T20) and high-frequency (T100) doublets, low-to-high-frequency fatigue ratio (T20/100) and single twitch peak torque (TWPT) were assessed before, immediately after, then 15 and 30 minutes after each fatiguing protocol. Result Inferential statistics using RM ANOVA and post hoc tests revealed statistically significant declines from baseline values in MVC, T20, T100, T20/100 and TWPT in all trials, but not in %VA. No significant differences were found between WBV and SHAM conditions. Conclusion Our findings suggest that the origin of fatigue induced by WBV is not significantly different compared to control conditions without vibrations. The lack of significant differences in %VA and the significant decline in other assessed parameters suggest that fatiguing protocols used in this study induced peripheral fatigue of a similar magnitude in all trials.

中文翻译：

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全身振动对神经肌肉疲劳的影响：一项不同持续时间组的研究


背景 全身振动已被用作一种运动方式或作为研究神经肌肉整合的工具。越来越多的证据表明，较长时间的 WBV 暴露（长达 10 分钟）会导致神经肌肉功能的急性损伤。然而，人们对 WBV 引起的疲劳的程度和根源知之甚少。目的本研究旨在调查不同持续时间组的半蹲长时间暴露全身振动干预（WBV）引起的神经肌肉疲劳的程度和根源，并将其与非振动（SHAM）条件进行比较。方法 10 名受过娱乐训练的年轻成年人参加了 6 次疲劳试验，每次试验包括保持蹲姿数组，持续时间为 30、60 或 180 秒。静态蹲下叠加振动（WBV30、WBV60、WBV180）或无振动（SHAM30、SHAM60、SHAM180），每次试验的总运动时间为 9 分钟。最大随意收缩 (MVC)、随意激活水平 (%VA)、低频 (T20) 和高频 (T100) 双峰、低频到高频疲劳比 (T20/100) 和单次抽搐峰值扭矩 (在每个疲劳方案之前、之后立即、之后 15 分钟和 30 分钟评估 TWPT）。结果 使用 RM 方差分析和事后检验的推论统计显示，所有试验中 MVC、T20、T100、T20/100 和 TWPT 相对于基线值均出现统计显着下降，但 %VA 则不然。 WBV 和 SHAM 条件之间没有发现显着差异。结论 我们的研究结果表明，与无振动的控制条件相比，WBV 引起的疲劳根源没有显着差异。 %VA 缺乏显着差异，并且其他评估参数显着下降，表明本研究中使用的疲劳方案在所有试验中引起了类似程度的外周疲劳。