PNF and Movement 2019; 17(3): 401-409
https://doi.org/10.21598/JKPNFA.2019.17.3.401
Effect of Head and Leg Positions on Trunk and Upper Trapezius Muscle Activities during Plank Exercise
Soo-Han Kim, P.T., Ph.D⋅Se-Yeon Park, P.T., Ph.D
Department of Physical therapy, Kaya university
Correspondence to: Se-Yeon Park (arclain@naver.com)
Received: July 29, 2019; Revised: August 29, 2019; Accepted: September 5, 2019; Published online: December 31, 2019.
© 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 investigated the muscular activity of abdominal muscles during a variety of plank exercises following changes in the leg and head positions.
Methods: Thirty healthy individuals participated in this study. They performed six variations of plank exercises, including three changes in head position and two changes in leg position. Each plank was defined as head neutral-leg neutral, head up-leg neutral, head down-leg neutral, head neutral-leg wide, head up-leg wide, and head down-leg wide. During the plank excises, the muscle activities of the rectus abdominis, internal oblique, erector spinae, and upper trapezius were measured.
Results: The head down position significantly increased the rectus abdominis activity compared to other head positions (p<0.05). On the other hand, the upper trapezius muscle activity was significantly higher with the head up position compared to other head positions (p<0.05). Regardless of head positions, both the rectus abdominis and internal oblique muscles were significantly activated with leg wide position compared to the leg neutral position (p<0.05).
Conclusion: Head and leg positions could change the muscular activities of abdominal muscles during plank exercises. For example, the head down position is effective for activating the rectus abdominis while the leg wide position could be advantageous for enhancing the internal oblique and rectus abdominis.
Keywords: Core muscle, EMG, Plank exercise, Prone bridge exercise


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