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Comparison of Muscle Activity in Proximal Muscle of Lower Extremities during Lunge according to the Anterior-posterior Distance of Foot Position
J korean soc phys med 2018;13(4):131-138
Published online November 30, 2018;  https://doi.org/10.13066/kspm.2018.13.4.131
© 2018 Korean Society of Physical Medicine.

Hoon-Young Park, PT, BSc⋅Nan-Hyang Kim, PT, MSc1⋅Yong-Jun Cha, PT, Ph.D2†

Department of Physical Therapy, Graduate School of Health and Medicine, Daejeon University
1Department of Physical Therapy, Graduate School, Daejeon University
2Department of Physical Therapy, College of Health and Medical Science, Daejeon University
Received October 3, 2018; Revised October 8, 2018; Accepted November 4, 2018.
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: This study was conducted to compare the muscle activity of the proximal muscles of the lower limb according to the distance between the front and rear foot during lunge and to determine the most effective foot position for activation of the proximal muscle in the limb.
METHODS: A total of 49 young adults were enrolled in this study. All subjects performed lunge by positioning the big toe of the back foot and the heel of the front foot at intervals of 40%, 60%, and 80% of the subject's own leg length. Muscle activity of the vastus medialis oblique, rectus femoris (RF), vastus lateralis oblique (VLO), gluteus medius, biceps femoris, and semitendinosus (ST) was then measured during three intervals of lunge operation. Each operation was measured three times for 10 seconds each, after which the average value was calculated and analyzed.
RESULTS: There were significant differences in muscle activities of RF, VLO, and ST among the three intervals of the foot (p<.05). Post hoc, comparisons revealed lunge at 40% intervals resulted in higher RF and VLO activity than at 60% and 80% intervals (p<.05). In the semitendinosus muscle, 80% leg length intervals showed higher muscle activity than 40% (p<.05).
CONCLUSION: Strengthening of the proximal muscles of the lower extremities during lunge exercise is considered to be most effective when placing the fore- and rear foot at intervals corresponding to 40% of the leg length.
Keywords : Distance, Electromyography, Muscle strength, Lunge exercise


November 2018, 13 (4)
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