Abstract
Objective
To determine the immediate effects of a single session of whole-body vibration (WBV)
and local muscle vibration (LMV) on quadriceps function in individuals with anterior
cruciate ligament reconstruction (ACLR).
Design
Singe-blind, randomized crossover trial.
Setting
Research laboratory.
Participants
Population-based sample of individuals with ACLR (N=20; mean age ± SD, 21.1±1.2y;
mean mass ± SD, 68.3±14.9kg; mean time ± SD since ACLR, 50.7±21.3mo; 14 women; 16
patellar tendon autografts, 3 hamstring autografts, 1 allograft).
Interventions
Participants performed isometric squats while being exposed to WBV, LMV, or no vibration
(control). Interventions were delivered in a randomized order during separate visits
separated by 1 week.
Main Outcome Measures
Quadriceps active motor threshold (AMT), motor-evoked potential (MEP) amplitude, Hoffmann
reflex (H-reflex) amplitude, peak torque (PT), rate of torque development (RTD), electromyographic
amplitude, and central activation ratio (CAR) were assessed before and immediately
after a WBV, LMV, or control intervention.
Results
There was an increase in CAR (+4.9%,
P=.001) and electromyographic amplitude (+16.2%,
P=.002), and a reduction in AMT (–3.1%,
P<.001) after WBV, and an increase in CAR (+2.7%,
P=.001) and a reduction in AMT (–2.9%,
P<.001) after LMV. No effect was observed after WBV or LMV in H-reflex, RTD, or MEP
amplitude. AMT (–3.7%,
P<.001), CAR (+5.7%,
P=.005), PT (+.31Nm/kg,
P=.004), and electromyographic amplitude (
P=.002) in the WBV condition differed from the control condition postapplication. AMT
(–3.0%
P=.002), CAR (+3.6%,
P=.005), and PT (+.30Nm/kg,
P=.002) in the LMV condition differed from the control condition postapplication. No
differences were observed between WBV and LMV postapplication in any measurement.
Conclusions
WBV and LMV acutely improved quadriceps function and could be useful modalities for
restoring quadriceps strength in individuals with knee pathologies.
Keywords
List of abbreviations:
ACLR ( anterior cruciate ligament reconstruction), AMT ( active motor threshold), CAR ( central activation ratio), CI ( confidence interval), ES ( effect size), H-reflex ( Hoffmann reflex), LMV ( local muscle vibration), MEP ( motor-evoked potential), MVIC ( maximal voluntary isometric contraction), PT ( peak torque), RTD ( rate of torque development), VT ( vibration therapy), WBV ( whole-body vibration)To read this article in full you will need to make a payment
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Article Info
Publication History
Published online: February 08, 2016
Footnotes
Supported by the American College of Sports Medicine Foundation Doctoral Research Grant Program (grant no. FRG–51 ), and the American Society of Biomechanics Grant-in-Aid program .
Disclosures: none.
Identification
Copyright
© 2016 by the American Congress of Rehabilitation Medicine
