Article

OBJECTIVE: To determine whether a platform exercise program with vibration is
more effective than platform exercise alone for improving lower limb muscle
strength and power in women ages 45 to 60 with risk factors for knee
osteoarthritis (OA). DESIGN: Randomized, controlled study. SETTING: Academic
center. PARTICIPANTS: A total of 48 women ages 45-60 years with risk factors for
knee OA (a history of knee injury or surgery or body mass index >/=25 kg/m(2)).
INTERVENTIONS: Subjects were randomly assigned to a twice-weekly lower limb
exercise program (quarter squat, posterolateral leg lifts, calf raises, step-ups,
and lunges) on either a vertically vibrating platform (35 Hz, 2 mm) or a
nonvibrating platform. MAIN OUTCOME MEASUREMENTS: Change in isokinetic quadriceps
strength, leg press power, and stair climb power by 12 weeks. RESULTS: A total of
39 of 48 enrolled participants completed the study (26 vibration and 13 control
exercise). Nine participants discontinued the study after randomization mainly
because of a lack of time. No intergroup differences in age, body mass index, or
activity level existed. Isokinetic knee extensor strength did not significantly
improve in either group. Leg press power improved by 92.0 +/- 69.7 W in the
vibration group (P < .0001) and 58.2 +/- 96.2 W in the control group (P = .0499)
but did not differ between groups (P = .2262). Stair climb power improved by 53.4
+/- 64.7 W in the vibration group (P = .0004) and 55.7 +/- 83.3 W in the control
group (P = .0329) but did not differ between groups (P = .9272). CONCLUSIONS:
Whole body vibration platforms have been marketed for increasing strength and
power. In this group of asymptomatic middle-aged women with risk factors for knee
OA, the addition of vibration to a 12-week exercise program did not result in
significantly greater improvement in lower limb strength or power than did
participation in the exercise program without vibration.
CI - Copyright (c) 2013 American Academy of Physical Medicine and Rehabilitation.
Published by Elsevier Inc. All rights reserved.

Langue : ANGLAIS