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ISSN: 2165-7025

Journal of Novel Physiotherapies
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Research Article

The Imagined Muscle Contraction Strengths did not affect the Changes of Spinal Motor Neurons Excitability

Yoshibumi Bunno1,2*, Chieko Onigata2 and Toshiaki Suzuki1,2

1Graduate School of Health Sciences, Graduate School of Kansai University of Health Sciences, Japan

2Clinical Physical therapy Laboratory, Kansai University of Health Sciences, Japan

*Corresponding Author:
Yoshibumi Bunno
Graduate School of Health Sciences
Graduate School of Kansai University of Health Sciences
2-11-1, Wakaba, Kumatori, Sennan, Osaka 590-0482, Japan
Tel: +81 72-453-8374
Fax: +81 72-453-8798
E-mail: [email protected]

Received date: June 10, 2016; Accepted date: July 04, 2016; Published date: July 14, 2016

Citation: Bunno Y, Onigata C, Suzuki T (2016) The Imagined Muscle Contraction Strengths did not affect the Changes of Spinal Motor Neurons Excitability. J Nov Physiother S3:008. doi:10.4172/2165-7025.S3-008

Copyright: © 2016 Bunno Y, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.



Background: Motor imagery can facilitate the spinal motor neurons excitability. However, it is unclear whether the imagined muscle contraction strengths affects the changes of spinal motor neurons excitability. Methods: The F-waves of the left thenar muscles were recorded in 10 healthy volunteers while the muscle was relaxed. In motor imagery trial, subjects imagined the thenar muscles activity at maximal voluntary contractions of 10%, 30%, 50%, and 70% while holding the sensor of the pinch meter; In post-imagery trial, immediately after motor imagery, the F-waves was recorded under resting. Results: Persistence and F/M amplitude ratio during motor imagery under all imagined muscle contraction strengths were significantly increased than at rest. However, there were no significant differences in the relative values of persistence, F/M amplitude ratio, and latency under all motor imagery conditions. Conclusions: Motor imagery under maximal voluntary contractions of 10%, 30%, 50%, and 70% can increase the spinal motor neurons excitability, but excitability does not vary with the imagined muscle contraction strengths.


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