Document Detail

Low resonance frequency vibration affects strength of paretic and non-paretic leg differently in patients with stroke.
MedLine Citation:
PMID:  20511126     Owner:  NLM     Status:  MEDLINE    
The objective of the study was to investigate the chronic effect of low frequency whole body vibration (WBV) on isometric and eccentric strength of knee extensors with different force exertion capacity. It was hypothesized that (1) four-week WBV intervention with the low frequency domain would enhance muscle strength and (2) the improvement would be more pronounced in the weaker muscle. To test our hypothesis twenty patients with acute stroke were recruited. Ten patients were randomly assigned to vibration and the remaining ten patients served for control.The patients in the vibration group received WBV with 20 Hz frequency three times per week standing on a vibration platform in half squat position meanwhile flexing and extending the joints and placing the weight from one leg to the other. Knee extensor strength was determined under isometric and eccentric contraction before and after WBV intervention. Myoelectrical activity (EMG) of the vastus lateralis muscle was also measured.Significant improvement was revealed in the vibration group only. The maximum isometric torque and EMG activity increased significantly for both paretic and non-paretic leg, but the improvement was threefold greater in the vibration group. No significant alteration was found in rate of torque development. Maximum eccentric torque and EMG increased significantly for the paretic leg only. Mechanical work enhanced significantly in the paretic side only.The results of our study indicate that the selection of the effective vibration frequency depends upon the physical condition of neuromuscular system. Low vibration frequency intervention can increase the strength in weak muscles due to neuromuscular impairment and restricted physical activity.
J Tihanyi; R Di Giminiani; T Tihanyi; G Gyulai; L Trzaskoma; M Horváth
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Acta physiologica Hungarica     Volume:  97     ISSN:  0231-424X     ISO Abbreviation:  Acta Physiol Hung     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-31     Completed Date:  2010-07-06     Revised Date:  2010-07-16    
Medline Journal Info:
Nlm Unique ID:  8309201     Medline TA:  Acta Physiol Hung     Country:  Hungary    
Other Details:
Languages:  eng     Pagination:  172-82     Citation Subset:  IM    
Department of Biomechanics, Faculty of Physical Education and Sport Sciences, Semmelweis University, Budapest, Hungary.
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MeSH Terms
Isometric Contraction*
Middle Aged
Muscle Strength*
Muscle, Skeletal / physiopathology*
Paralysis / etiology,  physiopathology,  rehabilitation*
Recovery of Function
Stroke / complications,  physiopathology*,  rehabilitation*
Time Factors
Treatment Outcome
Vibration / therapeutic use*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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