Acute effects of whole body vibration during passive standing on soleus H-reflex in subjects with and without spinal cord injury

Neuroscience Letters
Dimitry G SayenkoB Catharine Craven

Abstract

Whole-body vibration (WBV) is being used to enhance neuromuscular performance including muscle strength, power, and endurance in many settings among diverse patient groups including elite athletes. However, the mechanisms underlying the observed neuromuscular effects of WBV have not been established. The extent to which WBV will produce similar neuromuscular effects among patients with neurological impairments unable to voluntarily contract their lower extremity muscles is unknown. We hypothesized that modulation of spinal motorneuronal excitability during WBV may be achieved without voluntary contraction. The purpose of our study was to describe and compare the acute effects of WBV during passive standing in a standing frame on the soleus H-reflex among men with and without spinal cord injury (SCI). In spinal cord intact participants, WBV caused significant inhibition of the H-reflex as early as 6s after vibration onset (9.0+/-3.9%) (p<0.001). The magnitude of the H-reflex gradually recovered after WBV, but remained significantly below initial values until 36s post-WBV (57.5+/-22.0%) (p=0.01). Among participants with SCI, H-reflex inhibition was less pronounced with onset 24 s following WBV (54.2+/-18.7%) (p=0.03). The magnitu...Continue Reading

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