Journal of Applied Physiology AJP: Renal Physiology
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J Appl Physiol 89: 1420-1424, 2000;
8750-7587/00 $5.00
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Vol. 89, Issue 4, 1420-1424, October 2000

Decrease in maximal voluntary contraction by tonic vibration applied to a single synergist muscle in humans

Motoki Kouzaki, Minoru Shinohara, and Tetsuo Fukunaga

Laboratory of Sports Sciences, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro, Tokyo 153-8902, Japan

The purpose of the study was to examine the effect of prolonged tonic vibration applied to a single synergist muscle on maximal voluntary contraction (MVC) and maximal rate of force development (dF/dtmax). The knee extension MVC force and surface electromyogram (EMG) from the rectus femoris (RF), vastus lateralis (VL), and vastus medialis (VM) during MVC were recorded before and after vibration of RF muscle at 30 Hz for 30 min. MVC, dF/dtmax, and the integrated EMG (iEMG) of RF decreased significantly after prolonged tonic vibration in spite of no changes in iEMG of VL and VM. The present results indicate that MVC and dF/dtmax may be influenced by the attenuated Ia afferent functions of a single synergist muscle.

tonic muscle vibration; synergistic muscles; maximal voluntary contraction; electromyogram


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