PNF and Movement 2021; 19(2): 215-223
https://doi.org/10.21598/JKPNFA.2021.19.2.215
Comparison of the Contraction Ratios of the Transversus Abdominis Muscle During the Abdominal Drawing-in Maneuver in the Hook-Lying, Sitting, and Standing Positions
Jong-Im Won, P.T., Ph.D.
Dept. of Physical Therapy, College of Medical Science, Jeonju University
Correspondence to: Jong-Im Won (ptwon@jj.ac.kr)
Received: July 1, 2021; Revised: July 19, 2021; Accepted: July 28, 2021; Published online: August 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: This study aimed to compare the contraction ratios of the abdominal muscles and the preferential activation ratios of the transversus abdominis muscle (TrA) during the abdominal drawing-in maneuver (ADIM) in the hook-lying, sitting, and standing positions.
Methods: This study included 30 healthy participants. The thicknesses of the TrA, internal oblique muscle (IO), and external oblique muscle (EO) were measured at rest and during the ADIM in the hook-lying, sitting, and standing positions using B-mode ultrasound imaging. The contraction ratios of these muscles and the preferential activation ratios of the TrA were calculated for each position.
Results: The contraction ratio of the TrA and preferential activation ratio of the TrA during the ADIM in the hook-lying position were significantly higher than those in the sitting and standing positions (p ˂ 0.05). The contraction ratio of the TrA during the ADIM in the sitting position was significantly higher than that in the standing position (p ˂ 0.05).
Conclusion: The hook-lying position tended to facilitate TrA activity better than the sitting position. Furthermore, the sitting position tended to facilitate TrA activity better than the standing position. These findings suggest that the ADIM in the hook-lying position should be implemented before that in the sitting position and that the ADIM in the sitting position should be implemented before that in the standing position.
Keywords: Sitting positions, Standing positions, Transversus abdominis, Ultrasonography


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