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10 Hz periodic component influences lower frequency component of the physiological tremor at low force levels
| 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)
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Submitter: 河原 剛一
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