A comparison of different vibration exercise techniques on neuromuscular performance

Area of Science:

• Exercise Physiology
• Biomechanics
• Neuromuscular Function

Background:

• Whole-body vibration (WBV) is increasingly used in exercise interventions.
• Its effects on isometric exercises, particularly hand grip, require further investigation.
• Understanding the impact of localized vibration alongside WBV is crucial.

Purpose of the Study:

• To examine the effects of WBV during isometric hand-grip exercise.
• To determine if combining WBV with arm vibration enhances exercise outcomes.
• To assess changes in hand grip strength and muscle activation patterns.

Main Methods:

• Twenty-eight students performed isometric hand-grip exercises under three conditions: WBV with arm vibration (WBV+AV), arm vibration only (AV), and control (no vibration).
• Hand grip strength and electromyography (EMGrms) of the extensor digitorum muscle were measured.
• A randomized crossover design was employed.

Main Results:

• Hand grip strength showed a slight, non-significant increase in the WBV condition compared to control and AV.
• The WBV+AV condition significantly reduced co-activation of the extensor digitorum muscle during a flexor task.
• Increased muscle activation was observed near vibratory foci in both upper and lower body.

Conclusions:

• WBV combined with arm vibration may acutely enhance muscle coordination and decrease co-contraction.
• WBV alone did not significantly increase hand grip strength in this context.
• Vibration appears to increase muscle activation in proximity to the vibratory stimulus.