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Title: Immediate effects of 2 different whole-body vibration frequencies on muscle peak torque and stiffness
Authors: Siu, PM 
Tam, BT
Chow, DH
Guo, JY
Huang, YP
Zheng, YP 
Wong, SH
Keywords: Muscle, skeletal
Muscle strength
Issue Date: 2010
Publisher: W.B. Saunders
Source: Archives of physical medicine and rehabilitation, 2010, v. 91, no. 10, p. 1608-1615 How to cite?
Journal: Archives of physical medicine and rehabilitation 
Abstract: 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.
ISSN: 0003-9993
EISSN: 1532-821X
DOI: 10.1016/j.apmr.2010.07.214
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