Whole-Body Vibration Exercise in Different Postures on Handgrip Strength in Healthy Women: A Cross-Over Study.

Luciana Martins Mello Santos ,Vanessa Pereira De Lima ,Pedro Henrique Scheidt Figueiredo ,Ana Lúcia Cristino De Souza ,Redha Taı̈ar ,Fábio Luiz Mendonça Martins ,Mário Bernardo-Filho ,Jousielle Márcia Dos Santos ,Alessandro Sartório ,Sueli Ferreira Da Fonseca ,Joyce Noelly Vítor Santos ,Henrique Silveira Costa ,Ana Oliveira ,José Luiz Fernandes ,Ana Caroline Negreiros Prates ,Vanessa Gonçalves César Ribeiro ,Luana Aparecida Soares ,Hércules Ribeiro Leite ,Vanessa Amaral Mendonça ,Daniel Tezoni Borges ,Arthur Nascimento Arrieiro ,Angélica F Silva ,Ana Cristina Rodrigues Lacerda

doi:10.3389/fphys.2020.469499

Abstract

ObjectiveTo compare the effect of Whole-Body Vibration Exercise (WBVE) applied in push-up modified and half-squat positions, on handgrip strength (HS) and on the electromyography registry (EMGrms) of the flexor digitorum superficialis muscle (FDSM) of the dominant hand.MethodsNineteen healthy women (age 23.40 ± 4.03 years, bodyweight: 58.89 ± 9.87 kg), performed in a randomized order five different tests: (S1) Control; (S2) Push-up modified; (S3) Push-up placebo; (S4); Half-squatting; (S5) Half-squatting placebo. The HS and the EMGrms were assessed at baseline and immediately after the tests. ANOVA two-way design mixed test, with Tukey post hoc, was used to evaluate the HS, EMGrms and the ratio between EMGrms and HS, i.e., neural ratio (NR). Thus, the lower NR represents the greater neuromuscular modifications. The statistical significance level was set up at p < 0.05.ResultsWBVE on S2 increased HS compared to the stimulus applied to the S4 (p = 0.0001). The increase in HS was associated with a reduction in the EMGrms of the FDSM (p < 0.001) and a lower NR (p < 0.0001), i.e., greater neuromuscular modifications, in the S2 compared to the S4 after the tests.ConclusionThe distance of the stimulus and the positioning on the vibratory platform influence the maximum muscular strength due to neuromuscular modifications of hands in healthy women.

Highlights

The Whole-body vibration exercise (WBVE) has received plenty of attention for its ability for improving strength and power in the lower-body (Cormie et al, 2006; Avelar et al, 2012; Teles et al, 2015), whereas only a few studies investigated the effects of the vibratory stimulus on upper-body to date (Cochrane and Hawke, 2007; Marín et al, 2010, 2013; Jones et al, 2017)
Baseline handgrip strength (HS), EMGrms of the flexor digitorum superficialis muscle, and neural ratio (NR) were similar at baseline (Table 2)
To the best of our knowledge, only one study has assessed the effects of WBVE in different positions (30 s of rest and 30 s of WBVE on the push-up, and squat conditions) on HS and muscular activity of flexor digitorum superficialis muscle (FDSM) in military soldiers (Morel et al, 2018), and no positive effects being recorded

Summary

Introduction

The Whole-body vibration exercise (WBVE) has received plenty of attention for its ability for improving strength and power in the lower-body (Cormie et al, 2006; Avelar et al, 2012; Teles et al, 2015), whereas only a few studies investigated the effects of the vibratory stimulus on upper-body to date (Cochrane and Hawke, 2007; Marín et al, 2010, 2013; Jones et al, 2017). In the clinical and rehabilitation scenario, handgrip strength (HS) can be used for clinical-functional assessment and diagnosis, evolution and progression of the treatment (Shiratori et al, 2014). It can be utilized as an indicator of overall strength and general health status (Massy-Westropp et al, 2004). In this context, assuming that the WBVE is capable of promoting a strength increase, the study of practices increasing the strength in the upper-body of women becomes extremely important since the higher upper-limbs injuries affect more the females. The hands are important body segments involved with physical performance in different sports (Barut et al, 2008)

Methods

Results

Conclusion