No Specific Effect of Whole-Body Vibration Training in Chronic Stroke: A Double-Blind Randomized Controlled Study

Abstract

Brogårdh C, Flansbjer UB, Lexell J. No specific effect of whole-body vibration training in chronic stroke: a double-blind randomized controlled study. ObjectiveTo evaluate the effects of whole-body vibration (WBV) training in individuals after stroke. DesignA double-blind randomized controlled study with assessments pre- and posttraining. SettingA university hospital rehabilitation department. ParticipantsParticipants (N=31; mean age ± SD, 62±7y; 6–101mo poststroke) were randomized to an intervention group or a control group. InterventionsSupervised WBV training (2 sessions/wk for 6wk; 12 repetitions of 40–60s WBV per session). The intervention group trained on a vibrating platform with a conventional amplitude (3.75mm) and the control group on a “placebo” vibrating platform (0.2mm amplitude); the frequency was 25Hz on both platforms. All participants and examiners were blinded to the amplitudes of the 2 platforms. Main Outcome MeasuresPrimary outcome measures were isokinetic and isometric knee muscle strength (dynamometer). Secondary outcome measures were balance (Berg Balance Scale), muscle tone (Modified Ashworth Scale), gait performance (Timed Up & Go, comfortable gait speed, fast gait speed, and six-minute walk tests), and perceived participation (Stroke Impact Scale). ResultsThere were no significant differences between the 2 groups after the WBV training. Significant but small improvements (P<.05) in body function and gait performance were found within both groups, but the magnitude of the changes was in the range of normative variation. ConclusionsSix weeks of WBV training on a vibration platform with conventional amplitude was not more efficient than a placebo vibrating platform. Therefore, the use of WBV training in individuals with chronic stroke and mild to moderate disability is not supported.