Abstract
Siu PM, Tam BT, Chow DH, Guo J-Y, Huang Y-P, Zheng Y-P, Wong SH. Immediate effects
of 2 different whole-body vibration frequencies on muscle peak torque and stiffness.
Objective
To examine the immediate effects of 2 vibration protocols with different vibration
frequencies that yielded the same maximum acceleration (106.75ms−2) on muscle peak torque and stiffness of knee extensor and flexor.
Design
Randomized crossover study with repeated measures.
Setting
Laboratory setting.
Participants
Recreationally active male adults (N=10).
Intervention
Participants performed 10 bouts of 60-second static half squats intermitted with a
60-second rest period between bouts on a platform with no vibration (control) and
a vibration frequency of 26Hz or 40Hz.
Main Outcome Measures
Concentric and eccentric peak torques of knee extensor and flexor were examined within
5 minutes before and after vibration by isokinetic test. Young's modulus as an index
of tissue stiffness was determined at quadriceps and hamstring pre- and postvibration
by using an ultrasound indentation method.
Results
The 2-way repeated-measures analysis of variance indicated a significant interaction
effect between vibration and vibration frequency for knee extensor concentric peak
torque (P=.003). The vibration-induced changes of knee extensor concentric peak torque in vibration
frequency of 26Hz (14.5Nm) and 40Hz (12.0Nm) were found to be significantly greater
than that in controls (−29.4Nm) (P<.05). The change in eccentric peak torque of knee flexor after vibration tended to
be greater in 26Hz of vibration frequency when compared with controls (26Hz of vibration
frequency vs controls: 13.9±7.1 vs −11.4±5.3Nm, P=.08). No statistically significant differences were obtained in tissue stiffness
in the quadriceps and hamstring with any of the conditions.
Conclusions
Our data suggest that whole-body vibration at a frequency of 26Hz and 40Hz preclude
the decline in concentric peak torque of knee extensor observed after 10 bouts of
60 seconds of static half squats. A change in muscle mechanical stiffness property
as induced by whole-body vibration is not supported by our data.
Key Words
List of Abbreviations:
ANOVA (analysis of variance), amax (maximum acceleration), WBV (whole body vibration)To read this article in full you will need to make a payment
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Article info
Footnotes
Supported by The Hong Kong Polytechnic University Research Fund (grant no. G-U645); the equipment and resources were donated by The Hong Kong Jockey Club Charities Trust.
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the authors or on any organization with which the authors are associated.
Identification
Copyright
© 2010 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
