Immediate Effects of 2 Different Whole-Body Vibration Frequencies on Muscle Peak Torque and Stiffness

Parco M. Siu*, Bjorn T. Tam, Daniel H. Chow, Jing Yi Guo, Yan Ping Huang, Yong Ping Zheng, Stephen H. Wong

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

28 Citations (Scopus)


Siu PM, TamBT, 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 post vibration by using an ultrasound indentation method.

Results: The2-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.

Original languageEnglish
Pages (from-to)1608-1615
Number of pages8
JournalArchives of Physical Medicine and Rehabilitation
Issue number10
Publication statusPublished - Oct 2010


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