Effects of whole-body vibration on enhancing muscle strength and postural control in people with Parkinson's disease

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Effects of whole-body vibration on enhancing muscle strength and postural control in people with Parkinson's disease


Author: Lam, Ching Emily
Title: Effects of whole-body vibration on enhancing muscle strength and postural control in people with Parkinson's disease
Degree: M.Sc.
Year: 2012
Subject: Parkinson's disease -- Treatment.
Vibration -- Therapeutic use.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Rehabilitation Sciences
Pages: 52 leaves ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2507560
URI: http://theses.lib.polyu.edu.hk/handle/200/6678
Abstract: Objective: To examine the effects of whole-body vibration (WBV) on muscle strength and postural control in patients with Parkinson disease (PD). It was hypothesized that WBV treatment was effective in enhancing muscle strength and postural control in patients with PD. Design: Repeated measures design comparing pre & post-treatment test on muscle strength and postural control after WBV at 30Hz and without vibration. Participants: Fourteen subjects with PD completed the study. All of them were medically stable and diagnosed with idiopathic Parkinson's disease and were able to walk or stand independently with or without the use of walking aids. There were 4 females and 10 males, with mean age of 64.3±8.6 years; mean disease duration of 6.2±3.1 and with mean Hoehn & Yahor (H & Y) staging of 3.3±0.5. Intervention: All subjects received two sessions of treatment with vibration at 30Hz and without vibration (0Hz), with 7 to 9 days apart. The sequence of 30Hz and 0Hz was arranged in a randomized manner. During the treatment, participants stood on a oscillating platform and at the same time performed four exercises (semi-squatting at 30° and 90°, single leg standing on alternate leg and swaying forward and backward and). Each exercise was performed for 1 minute and with 2 minutes of rest after each exercise. The duration of vibration treatment was 4 minutes.
Outcome measure: Unified Parkinson's Disease Rating Scale (UPDRS) motor examination was tested in each session before the vibration therapy. The primary outcome measure was isometric and isokinetic concentric and eccentric knee muscle strength, which was assessed by Cybex dynamometer. The secondary outcome measures were postural sway and one-leg-stance (OLS) for testing postural instability. All subject received these three measures before and immediately after vibration treatment. One-way repeated measures analysis of variance (ANOVA) was used for data analysis. Result: For the muscle strength, there was a trend of reduction in the peak knee torque but they did not reach a significant level, with exception of knee extensors eccentric and isometric contraction. For eccentric contraction, there was significant decrease in the mean peak torque of knee extensors between pre-test and post-test at both angular speed of 90°/s and 45°/s at 30Hz. For isometric contraction, the mean peak torque of knee extensors significantly reduced in the post-test after both treatment sessions with (30Hz) and without vibration (0Hz). In the result of time to peak torque, subjects required significantly shorter time to reach the peak concentric knee flexors torque after both 0Hz and 30Hz, and significantly longer time to reach the peak eccentric knee flexors torque at 30Hz. For the postural sway test, the sway path (anterior-posterior and medial-lateral) and sway area in double-leg stance position showed no significant difference between pre-and post-test measurements. In addition there was marginally increase in the OLS time after both 30Hz and 0Hz treatment. Conclusion: Findings of the present study, it demonstrated no immediate effect of vibration therapy on enhancing muscle strength and postural control in patients with PD, further study is needed to examine the effect of different vibration frequency or longer treatment session on muscle strength in this patient population.

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