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The influence of vibration on muscle activation and rate of force development during maximal isometric contractions

Humphries, B, Warman, G, Purton, J, Doyle, TLA and Dugan, E (2004). The influence of vibration on muscle activation and rate of force development during maximal isometric contractions. Journal of Sports Science and Medicine,3(1):16-22.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 22 times in Scopus Article | Citations
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Title The influence of vibration on muscle activation and rate of force development during maximal isometric contractions
Author Humphries, B
Warman, G
Purton, J
Doyle, TLA
Dugan, E
Journal Name Journal of Sports Science and Medicine
Publication Date 2004
Volume Number 3
Issue Number 1
ISSN 1303-2968   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-12844265940
Start Page 16
End Page 22
Total Pages 7
Place of Publication TUR
Publisher University of Uludag
HERDC Category C1 - Journal Article (DEST)
Abstract At present there appears to be a need for research conducted on the effects of vibration on the contractile ability of skeletal muscle tissue. The aim of this study was to address this issue by examining the effects of a superimposed muscle/tendon vibration at 50.42 +/- 1.16 Hz (acceleration 13.24 +/- 0.18ms(-2): displacement approximate to 5mm) on muscular activation and maximal isometric contraction. Sixteen participants with a mean age, body mass, and height of 22 +/- 4.4 years, 73.2 +/- 11.7 kg and 173.1 +/- 9.7 cms, respectively, were recruited for this study. Electromyography and accelerometry from the rectus femoris, and maximal isometric force data characteristics were collected from the dominant limb under conditions of vibration, and no-vibration. A superimposed 50 Hz vibration was used during the contraction phase for the maximal isometric leg extension for the condition of vibration. A one-way ANOVA revealed no significant (p>0.05) differences between the vibration and no-vibration conditions for peak normalized EMGRMS (84.74% Vs 88.1%) values. An ANOVA revealed significant (p>0.05) differences between the peak fundamental frequencies of the FFT between the conditions vibration (27.1 +/- 12.2 Hz) and no-vibration (9.8 +/- 3.5 Hz). Peak isometric force, peak rate of force development, rate of force development at times 0.05, 0.01, 0.1, 0.5 seconds, and rate of force development at 50, 75, and 90% of peak force were not significantly different. The results of this study suggest that the application of vibration stimulation at 50 Hz during the contraction does not contribute to muscle activation, or enhance force production for maximal isometric contractions.
Keywords strength
oscillations
isometric
peak
muscle activation
whole-body vibration
skeletal-muscle
stimulation
strength
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URL http://www.jssm.org/
 
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