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Immediate Effect of Postural Control of the Contra-Lateral Side on Exercise-Induced Fatigue of the Ipsi-Lateral Plantar Flexor Muscle
J Kor Phys Ther 2018;30(2):63-66
Published online April 30, 2018;
© 2018 The Korea Society of Physical Therapy.

Sung Min Son

Department of Physical Therapy, College of Health Science, Cheongju University, Cheongju, Korea
Sung Min Son
Received March 19, 2018; Revised April 23, 2018; Accepted April 27, 2018.
This is an Open Access article distribute under the terms of the Creative Commons Attribution Non-commercial License ( which permits unrestricted non-commercial use, distribution,and reproduction in any medium, provided the original work is properly cited.
Purpose: The purpose of the current study was to examine the effects of exercise-induced fatigue of the plantar flexor muscle in the dominant ankle on the plantar flexor strength and postural control function of the contra-lateral side.
Methods: Twenty-one young adults (male: 10, female: 11) volunteered to participate in this study. An exercise-induced fatigue protocol to induce fatigue was performed in the plantar flexor of the dominant ankle. For the fatigue protocol, the participants were instructed to raise their heels as high as possible in the position with one leg stance of the dominant lower limb, and the heel was then downed after holding for 1 second. The muscle strength of the contra-lateral plantar flexor was measured using a digital muscle strength test device, and the static and dynamic postural control were tested by acquiring the center of gravity velocity while performing one leg standing. A paired t-test was used to identify the differences between the pre- and post, and the data were analyzed using SPSS 12.0 software.
Results: Comparison of the pre- and post-test data revealed a significant difference in the plantar flexor strength and dynamic postural control after exercise-induced muscle fatigue in the dominant side. On the other hand, there was no significant difference in the static postural control.
Conclusion: These findings have practical implications, suggesting that unilateral muscle fatigue affects the ankle muscle strength and postural ability of the contralateral side.
Keywords : Cross-education, Cross-effect, Fatigue, Postural control

April 2018, 30 (2)
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