Abstract
BackgroundWhole 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.PurposeThe 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.MethodsTen 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.ResultInferential 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.ConclusionOur 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.
Highlights
Whole body vibration (WBV) transfers sinusoidal oscillations into the human body, which inspired the use of this physical modality both as a tool to study the sensorimotor integrationHow to cite this article Kalc M, Ritzmann R, Strojnik V. 2020
The current study aimed to investigate the magnitude and origin of neuromuscular fatigue induced by long-exposure half-squat whole-body vibration intervention (WBV) with sets of different duration and compare it with non-vibration (SHAM) conditions
Knee extensors Maximum voluntary contraction (MVC) torque dropped by 7 to 12% after each fatiguing protocol, which is in line with other WBV induced fatigue studies, where MVC torque decreased by approximately 8% (De Ruiter et al, 2003; Erskine et al, 2007; Colson et al, 2009; Zory et al, 2013)
Summary
Whole body vibration (WBV) transfers sinusoidal oscillations into the human body, which inspired the use of this physical modality both as a tool to study the sensorimotor integrationHow to cite this article Kalc M, Ritzmann R, Strojnik V. 2020. Effects of whole-body vibrations on neuromuscular fatigue: a study with sets of different durations. The acute increase in neuromuscular performance after vibration is referred to as ‘postactivation potentiation’ (PAP) for short-lasting enhancements (less than 1 min) and as ‘post-activation performance enhancement’ (PAPE) for more extended performance enhancement periods lasting up to several hours (Blazevich & Babault, 2019) Both phenomena are related to vibration-induced changes in the neuronal control of the affected skeletal muscles that encompass a facilitated central drive (Mileva, Bowtell & Kossev, 2009; Krause et al, 2017) concomitant with modified reflexive activation at the spinal level (Rittweger, Beller & Felsenberg, 2000; Ritzmann et al, 2018) persistent over a period of 15 min after vibration exposure (Krause et al, 2016; Ritzmann et al, 2018). 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. 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
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