PNF and Movement 2021; 19(3): 341-349
https://doi.org/10.21598/JKPNFA.2021.19.3.341
The Effect of Soleus Muscle Stretching on Thickness and Muscle Tone of The Tibialis Anterior and Peroneus Longus Muscles in Healthy Young Adults
Hyo-Bin Jeon⋅Seong-Won Oh⋅Sun-Yeul Kim⋅Su-Jin Hwang, P.T., Ph.D.
Department of Physical Therapy, Division of Health Science, Baekseok University
Correspondence to: Su-Jin Hwang (ptsue@daum.net)
Received: November 8, 2021; Revised: November 28, 2021; Accepted: December 1, 2021; Published online: December 31, 2021.
© Korea Proprioceptive Neuromuscular Facilitation Association. All rights reserved.

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 purpose of this study was to investigate the effect of soleus muscle stretching on the muscle thickness and muscle tone of the tibialis anterior and peroneus longus muscles in healthy young adults.
Methods: This study was an observational, cross-sectional study design in healthy young adults. Thirty healthy young adults participated in the study. To investigate the effect of agonist elongation on the muscles’ antagonist and synergist characteristics, this study conducted the dynamic stretching of the soleus and plantarflexor muscles for 20 seconds. This study measured the muscle thickness and muscle tone of the soleus, tibialis anterior and peroneus longus muscles before stretching, immediately after stretching, and five minutes after stretching.
Results: After analysis, the muscle tone of the soleus muscle was significantly decreased immediately after stretching (20.91±2.61Hz) compared to before stretching (21.83±2.78Hz). The muscle tone of the tibialis anterior was significantly decreased both immediately after stretching (21.76±2.73Hz) and five minutes after stretching (21.72±3.25Hz) compared to before stretching (22.61±3.29Hz). The muscle thickness of the soleus muscle was significantly decreased immediately after stretching (2.04±0.52mm) compared to before stretching (2.21±0.51mm) and was significantly increased five minutes after stretching (2.14±0.49mm) compared to immediately after stretching.
Conclusion: The results of this study showed the static stretching of the soleus muscle changed the muscle tone of the tibialis anterior, but not of the peroneus longus muscle. This study suggests that the dynamic stretching of the agonist muscle would show meaningful muscle tone change in the antagonist.
Keywords: Adult, Peroneous longus, Soleus, Stretching, Tibialis anterior


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