PNF and Movement 2024; 22(2): 181-189
https://doi.org/10.21598/JKPNFA.2024.22.2.181
Effect of Sling-Applied Plank Exercise on the Muscular Frequency, Stiffness, Decrement of the Rectus Abdominis and Longissimus of the Trunk according to the Stability of the Base of Support
Jung-Gyu Yoon, P.T., Ph.D.†
Department of Physical Therapy, Namseoul University
Correspondence to: †Jung-Gyu Yoon (velsa@nsu.ac.kr)
Received: May 13, 2024; Accepted: June 2, 2024; Published online: August 31, 2024.
© 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 identify the effect of sling-applied plank exercise on the frequency, stiffness, and decrement of the rectus abdominis and longissimus muscles of the trunk according to the stability of the base of support.
Methods: Thirty-three young adults volunteered to participate and were randomly assigned to one of three groups (SS, stable support; LES, lower extremity support; and ULES, upper and lower extremity support) according to the stability of the base of support. The muscular properties of the rectus abdominis and longissimus muscles during sling-assisted plank exercise according to the stability of the base of support. were measured by using Myoton PRO (Myoton AS, Tallinn, Estonia). Statistical analysis was performed MANOVA to determine the effect of sling-assisted plank exercise on the muscular properties of the rectus abdominis and longissimus muscles according to the stability of the base of support. Post hoc analysis was conducted using Bonferroni. The level of statistical significance was set at α = 0.05.
Results: When comparing the muscular properties, the muscle frequency and stiffness of the left rectus abdominis of ULES were significantly decreased compared to that of SS (p < 0.05). In the measurement time, the muscle frequency and the muscle stiffness of the right rectus abdominis increased significantly after the intervention (p < 0.05).
Conclusion: It was concluded that the more unstable the base of support (ULES), the higher the exercise strength, and the muscle frequency and stiffness decreased on the rectus abdominis at rest.
Keywords: Plank exercise, Muscular properties, Rectus abdominis, Longissimus, Trunk, Base of support

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