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Effects of Fatigue in the Non-paretic Plantarflexor on the Activities of the Lower Leg Muscles during Walking in Chronic Stroke Patients
J Korean Soc Phys Med 2019;14(3):127-133
Published online August 31, 2019;  https://doi.org/10.13066/kspm.2019.14.3.127
© 2019 Journal of The Korean Society of Physical Medicine.

Jae-Woong Lee, PT, MS⋅Hyun-Mo Koo, PT, PhD1†

Department of Physical Therapy, Keunsol Hospital
1Department of Physical Therapy, College of Science, Kyungsung University
Received June 6, 2019; Revised June 10, 2019; Accepted June 20, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
PURPOSE: The aim of this study was to obtain detailed and quantified data concerning the effects of plantarflexor fatigue induced to the non-paretic side on muscle activities of the bilateral lower extremities during walking in chronic stroke patients.
METHODS: In this study, chronic stroke patients were evaluated for six months after the onset of stroke. To induce the non-paretic plantarflexor fatigue, 20 chronic stroke patients were asked to perform their given fatigue affecting assignments, which were presented in a forced contraction fatigue test method, until the range of motion of the plantarflexor was reduced to less than 50%. The muscle activities of the rectus femoris, tibialis anterior and gastrocnemius in the paretic and non-paretic lower extremities were measured using a wireless surface EMG before and after muscle fatigue induction.
RESULTS: The findings showed that after plantarflexor fatigue was induced on the non-paretic side, a significant decrease in muscle activities of the rectus femoris on the paretic side was noted (p<.05). The muscle activities of the tibialis anterior and gastrocnemius were also observed to decrease, but, these results were not statistically significant (p>.05). In the non-paretic side, there was a significantly decrease in the muscle activities of the rectus femoris, tibialis anterior, and gastrocnemius (p<.05).
CONCLUSION: These finding suggest that the muscle fatigue of the non-paretic plantarflexor affects not only the muscle activity of the ipsilateral lower extremity but also the muscles activity of the contralateral lower extremity. This highlights the necessity of performing exercise or training programs that do not cause muscle fatigue in clinical aspects.
Keywords : Chronic stroke, Muscle activation, Muscle fatigue


August 2019, 14 (3)
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