PNF and Movement 2019; 17(3): 451-461
The Effect of Abdominal Muscle Contraction Using Waist Circumference Change Sensors on Trunk Muscle Endurance and Postural Control in Healthcare Workers
Geun-Soo Yu, P.T., M.S.⋅Chang-Beom Kim, P.T., Ph.D1⋅In-Ho Cho, Ph.D2†
Department of Rehabilitation Center, VHS Medical Center
1Korea Proprioceptive Neuromuscular Facilitation Association in South Seoul⋅Gyeonggi
2Department of Health and Exercise Science, Korea National Sport University
Correspondence to: In-Ho Cho (
Received: September 24, 2019; Revised: November 8, 2019; Accepted: November 9, 2019; Published online: December 31, 2019.
© Korea Proprioceptive Neuromuscular Facilitation Association. All rights reserved.

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Purpose: This study identified the effect of abdominal muscle contraction using changes in waist circumference for healthcare workers with back pain due to inadequate posture during working hours.
Methods: In this study, we provided educational training focused on posture alignment and utilized waist circumference change sensors to induce the contraction of abdominal muscles as a method to address low back pain in healthcare workers. All 32 participants received the same training and then were assigned to two groups: wearing the keeping core band (CB) and not wearing the keeping core band (NCB). For the CB group, the waist circumference change sensor was applied for 6 weeks during working hours. Wilcoxon’s signed-ranks test and paired t-tests were used to compare the differences between the groups. All statistical significance levels were set to α=0.05.
Results: Trunk muscle endurance increased significantly in the CB group. There was no significant difference in stability index to evaluate static postural control, but active hip abduction tests, which evaluate dynamic postural control, showed significant decrease in the CB group.
Conclusion: These results suggest that the induction of abdominal contraction using the waist circumference change sensor may improve the trunk muscle endurance and the postural control ability of the hip and pelvis of healthcare workers.
Keywords: Health care workers, Back pain, Biofeedback, Waist circumference change sensor

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