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

Author: Pamukoff DN, Pietrosimone B, Lewek MD, Ryan ED, Weinhold PS, Lee DR, Blackburn JT
1Department of Kinesiology, California State University, Fullerton. 2Department of Exercise and Sport Science, The University of North Carolina at Chapel Hill. 3Curriculum in Human Movement Science, The University of North Carolina at Chapel Hill. 4Division of Physical Therapy, Department of Allied Health Sciences, The University of North Carolina at Chapel Hill. 5Department of Orthopedics, The University of North Carolina at Chapel Hill. 6Joint Department of Biomedical Engineering, The University of North Carolina at Chapel Hill and North Carolina State University.
Conference/Journal: Muscle Nerve.
Date published: 2016 Feb 13
Other: Special Notes: doi: 10.1002/mus.25081. [Epub ahead of print] , Word Count: 177

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; StrengthPMID: 26872828 [PubMed - as supplied by publisher]