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1 Department of Life Sciences, The University of Tokyo, Meguro, Tokyo, Japan; Department of Health Sciences, Oita University of Nursing and Health Sciences, Oita, Oita, Japan
2 Department of Integrative Physiology, University of Colorado, Boulder, Colorado, USA
3 Department of Life Sciences, The University of Tokyo, Meguro, Tokyo, Japan
4 Department of Life Sciences, The University of Tokyo, Meguro, Tokyo, Japan; Department of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan
* To whom correspondence should be addressed. E-mail: shinohara{at}colorado.edu.
The purpose of the study was to examine the effect of prolonged vibration on the force fluctuations during a force-matching task performed at low force levels. Fourteen young healthy men performed a submaximal force-matching task of isometric plantarflexion before and after Achilles tendon vibration (n = 8, vibration subjects) or lying without vibration (n = 6, control subjects) for 30 min. The target forces were 2.5-10% of the pre-vibration maximal voluntary contraction (MVC) force. The standard deviation of force decreased by a mean of 29 ± 20% across target forces after vibration, whereas it did not decrease significantly in control subjects (-5 ± 12%). This change was significantly greater compared with control subjects (P < 0.01 for both). Power spectral density of the force was predominantly composed of signals of low-frequency band-width (
5 Hz) with few higher-frequency components. In vibration subjects, there was a significant decrease in power in the frequency range 2 Hz after vibration. The decrease in power at this frequency range was linearly related to the decrease in the force fluctuations (r = 0.96, P < 0.001). The results indicate that prolonged Achilles tendon vibration reduces the fluctuations in plantarflexion force in the frequency range 2 Hz during low-level contractions. It suggests that Ia afferent inputs contribute to the low-frequency force fluctuations in plantarflexion.
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