Abstract
A pilot study investigating the influence of vibration during press ups on myoelectrical activity of both dynamic and stabiliser muscles. Nine male participants (21.1 ± 3.4 years, 1.68 ± 0.03 m, 72.3 ± 9.5 kg), performed press ups under 3 conditions: without vibration, low amplitude and frequency vibration (30L; 1.2 mm, 30 Hz) high amplitude and frequency vibration (40H; 1.9 mm, 40 Hz). Press ups were completed in a randomised order for a period of 15 s with 3 min rest. 3D motion capture with synchronous surface electromyography (EMG) of dynamic muscles (triceps, pectoralis major) and stabiliser muscles (serratus anterior, lower trapezius muscles). The introduction of vibration to press ups did not result in kinematic changes to exercises. No muscles analysed displayed significant increases in mean EMG amplitude in response to 30L VIB in the eccentric or the concentric phase of the exercise. 40H Vibration significantly increased EMG amplitudes of all muscles (p < 0.05) except the lower trapezius. Greater increases were observed during the concentric phase of movement. These results indicate that vibration influences muscle activity during press up exercises. However, further studies are required including additional information such as the transmission of vibration to the neck and head, should be completed.
Highlights
To date there have been many studies considering the effect of whole body vibration (WBV) on the lower body, as reviewed by Rehn et al.[1], yet there have been few investigations on the effects of WBV platforms on the upper body
Hazell et al [2]considered the effect of WBV during static and dynamic squats and bicep curls on EMG of both the upper and lower body, with results indicating significant increases in signal RMS, yet this was not a consequence of direct vibration of the upper body
Comparison between the 3 conditions showed no significant differences in the duration of the press ups, vertical displacement of the upper thorax (C7) or pelvis (S1) or spinal posture (C7-S1 distance)
Summary
To date there have been many studies considering the effect of whole body vibration (WBV) on the lower body, as reviewed by Rehn et al.[1], yet there have been few investigations on the effects of WBV platforms on the upper body. Hazell et al [2]considered the effect of WBV during static and dynamic squats and bicep curls on EMG of both the upper and lower body, with results indicating significant increases in signal RMS, yet this was not a consequence of direct vibration of the upper body. Gómez-Cabello et al [4] investigated the effects of 11 week dynamic squats with WBV and found significant increases in both lower and upper body strength. The aim of this study is to consider the effect of using WBV platforms on press up exercise performance (posture) and muscular activity (EMG).
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