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10 Hz periodic component influences lower frequency component of the physiological tremor at low force levels

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Title: 10 Hz periodic component influences lower frequency component of the physiological tremor at low force levels
Authors: Endo, Hiroshi Browse this author
Kawahara, Koichi Browse this author →KAKEN DB
Keywords: Force fluctuation
Physiological tremor
Motor unit synchronization
Discharge rate variability
Computer simulation
Issue Date: Nov-2011
Publisher: Springer-Verlag
Journal Title: European Journal of Applied Physiology
Volume: 111
Issue: 11
Start Page: 2695
End Page: 2705
Publisher DOI: 10.1007/s00421-011-1903-6
Abstract: A positive correlation has been reported between the amplitudes of the 10-Hz and lower frequency components of the physiological tremor (PT) at low force levels, though the generation mechanisms based on motor unit (MU) firing properties are different. This study aimed to investigate the causal relation between these fluctuations. A computer simulation was performed to alter the fluctuation intensity, which enabled manipulation of MU firing properties. Two types of MU contributions to synchronization activity were considered to influence the intensity of the 10-Hz PT: (1) number of MUs involved in synchronization and (2) synchrony between MUs. The impact of oscillatory excitatory input from the central nervous system on the generation of the 10-Hz PT was also evaluated. The results showed that the lower frequency fluctuation (LF fluctuation) was influenced by the number of MUs contributing to the 10-Hz PT amplitude. The synchrony between MUs and the oscillatory excitatory input had no influence on the LF fluctuation. In conclusion, MU synchronization in a certain frequency range increased the fluctuations not only at the synchronizing frequency but also at lower frequencies, and the number of MUs involved in synchronization was a plausible factor to explain the correlation between the 10-Hz and LF fluctuations.
Rights: The original publication is available at www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/50374
Appears in Collections:情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河原 剛一

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