Immediate effect of vibratory stimuli on quadriceps function in healthy adults.

INTRODUCTION: The purpose of this study was to compare the effect of whole body vibration (WBV) and local muscle vibration (LMV) on quadriceps function.

METHODS: Sixty adults were randomized to WBV, LMV, and control groups. Quadriceps function [Hoffmann (H) reflex, active motor threshold (AMT), motor evoked potential (MEP) and EMG amplitude, peak torque (PT), rate of torque development (RTD), and central activation ratio (CAR)] was assessed prior to and immediately, 10-minutes, and 20-minutes following interventions.

RESULTS: WBV improved PT, CAR, AMT, EMG, and MEP amplitude, and EMG amplitude and CAR were greater than control post-application. LMV improved EMG amplitude and AMT, and EMG amplitude was greater than control post-application. AMT remained lower 10 and 20 minutes following WBV and LMV. No differences were noted between LMV and WBV. Vibration did not influence H-reflex or RTD.

DISCUSSION: WBV and LMV increased quadriceps function and may be used to enhance the efficacy of strengthening protocols. This article is protected by copyright. All rights reserved.

© 2016 Wiley Periodicals, Inc.

KEYWORDS: Cortical; Hoffmann reflex; Muscle; Neuron; Quadriceps; Strength

PMID: 26872828 [PubMed - as supplied by publisher]