PNF and Movement 2022; 20(1): 51-58
The Effects of Thoracic-Lumbar Dissociate and Slump Motions on Thoracic-Lumbar Erector Spinae and Rectus Abdominis Activity
Ju-Hyeon Jung, P.T., Ph.D.1,2†
1Department of Physical Therapy, College of Nursing Healthcare Sciences and Human Ecology, Dong-Eui University
2The College of Nursing, Healthcare Sciences, and the Human Ecology Research Institute, Dong-Eui University
Correspondence to: Ju-Hyeon Jung (
Received: January 18, 2022; Revised: January 23, 2022; Accepted: January 26, 2022; Published online: April 30, 2022.
© Korea Proprioceptive Neuromuscular Facilitation Association. All rights reserved.

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Purpose: The purpose of this study was to investigate the effect of thoracic-lumbar dissociation motion and slump motion on thoracic-lumbar erector spinae and rectus abdominis muscle activity.
Methods: Seventeen healthy adult volunteers participated in this study. All participants performed two motions (thoracic-lumbar dissociation motion, slump motion). Muscle activation during the two motions was measured using a surface electromyography device. The data from this were collected from the iliocostalis thoracis, iliocostalis lumborum, and rectus abdominis. The activities of these muscles before and after each motion were then compared.
Results: The iliocostalis thoracis activation was significantly greater during the thoracic-lumbar dissociation motion than during the slump motion (p <0.05). The iliocostalis lumborum activation was greater during the slump motion than during the thoracic-lumbar dissociation motion (p <0.05). The rectus abdominis activation was lesser during the slump motion than during the thoracic-lumbar dissociation motion (p <0.05).
Conclusion: This study confirmed that individual contraction of the erector spinae muscles is possible during thoracic-lumbar dissociation motion, which increases the stability of the thoracic spine. In addition, this motion could improve control of the rectus abdominis. Therefore, thoracic-lumbar dissociation motion should be considered for rehabilitation programs for patients with kyphosis and back pain.
Keywords: Thoracic-lumbar dissociate motion, Slump motion, Muscle activity

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