Article

OBJECTIVE: To evaluate the effects of whole body vibration (WBV) and local muscle
vibration (LMV) on quadriceps function after experimental knee effusion (ie,
simulated pathology). DESIGN: Randomized controlled trial. SETTING: Research
laboratory. PARTICIPANTS: Healthy volunteers (N=43) were randomized to WBV
(n=14), LMV (n=16), or control (n=13) groups. INTERVENTIONS: Saline was injected
into the knee to induce quadriceps arthrogenic muscle inhibition (AMI). All
groups then performed isometric squats while being exposed to WBV, LMV, or no
vibration (control). MAIN OUTCOME MEASURES: Quadriceps function was assessed at
baseline, immediately after effusion, and immediately and 5 minutes after each
intervention (WBV, LMV, control) via voluntary peak torque (VPT) and the central
activation ratio (CAR) during maximal isometric knee extension on a multifunction
dynamometer. RESULTS: The CAR improved in the WBV (11.4%, P=.021) and LMV (7.3%,
P<.001) groups immediately postintervention, but they did not improve in the
control group. Similarly, VPT increased by 16.5% (P=.021) in the WBV group and
23% (P=.078) in the LMV group immediately postintervention, but it did not
increase in the control group. The magnitudes of improvements in the CAR and VPT
did not differ between the WBV and LMV groups. CONCLUSIONS: Quadriceps AMI is a
common complication following knee pathology that produces quadriceps dysfunction
and increases the risk of posttraumatic osteoarthritis. Quadriceps strengthening
after knee pathology is often ineffective because of AMI. WBV and LMV improve
quadriceps function equivocally after simulated knee pathology, effectively
minimizing quadriceps AMI. Therefore, these stimuli may be used to enhance
quadriceps strengthening, therefore improving the efficacy of rehabilitation and
reducing the risk of osteoarthritis.
CI - Copyright (c) 2014 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS