Article

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.
CI - Copyright (c) 2016 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS