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Comparison of Muscle Activity According to Hip Abduction Angle during Hip Extension Exercise in Prone Position
J korean soc phys med 2018;13(4):123-129
Published online November 30, 2018;
© 2018 Korean Society of Physical Medicine.

Youn-Ho Cho, PT⋅Han-Suk Lee, PT, PhD1† ⋅Sun-Wook Park, PT, PhD2

Department of Physical Therapy, Graduate School of Eulji University
1Department of Physical Therapy, Eulji University
2Department of Physical Therapy of Samsung Medical Center
Received October 11, 2018; Revised October 11, 2018; Accepted October 27, 2018.
This is an Open Access article distributed 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: This study was conducted to investigate the influence of hip abduction angle on the muscle activity of the Gluteus Maximus (GM), Biceps Femoris (BF) and Tensor Fascia Lata (TFL) during Knee Flexed Prone Hip Extension exercise.
METHODS: The subjects of this study were 42 healthy individuals. All participant consented to participate in this study. Subjects performed exercise, using the Knee Flexed Prone Hip Extension exercise in three hip abduction position 0°, 15° and 30°. Subjects rested two minutes, between changing hip abduction position. Data were analyzed using a Noraxon MR-XP 1.08 Master Edition EMG to determine average amplitude, for each angle and muscle. All data were processed by Multivariate analysis of variance (MANOVA). There were a total of three groups. the GM muscle, BF muscle, TFL muscle.
RESULTS: GM muscle activity was greatest in the 30° hip abduction position (p<.05), followed by 0°. Between 0° and 30° has significant difference in muscle activity. However, the BF and TFL amplitude were greatest at 0° hip abduction position followed by 30°. Moreover, the TFL differed significantly between 0° and 30°, but, BF did not (p<.05).
CONCLUSION: Hip abduction at 30° was found to be the most appropriate position for GM muscle activity.
Keywords : Electromyography, Hamstring muscles, Prone position

November 2018, 13 (4)
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