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The Effects of McKenzie Exercise on Forward Head Posture and Respiratory Function
J Kor Phys Ther 2019;31(6):351-357
Published online December 30, 2019;
© 2019 The Korea Society of Physical Therapy.

SeYoon Kim1, JuHyeon Jung2, NanSoo Kim3

1Department of Physical Therapy, Graduate School, Catholic University of Pusan, Busan; 2Department of Physical Therapy, Gimhae College, Gimhae; 3Department of Physical Therapy, College of Health Science, Catholic University of Pusan, Busan, Korea
Na-Soo Kim E-mail
Received November 4, 2019; Revised December 1, 2019; Accepted November 2, 2019.
This is an Open Access article distribute under the terms of the Creative Commons Attribution Non-commercial License (Http:// which permits unrestricted non-commercial use, distribution,and reproduction in any medium, provided the original work is properly cited.
Purpose: This study sought to investigate the effects of the McKenzie exercise program on forward head posture and respiratory function.
Methods: Thirty adult men and women with forward head posture, aged 20-29 years, were randomly assigned to the experimental group (N=15) or the control group (N=15). Subjects in the experimental group performed the McKenzie exercises three times a week for four weeks, while subjects in the control group did not receive any intervention. Craniovertebral angle (CVA) was measured to quantify forward head posture, and forced vital capacity (FVC), FVC % predicted, forced expiratory volume at one second (FEV1), and FEV1 % predicted were measured to determine changes in respiratory function. The Mann-Whitney U-test was used to analyze pre-test differences in forward head posture and respiratory function between the two groups, and the Wilcoxon signed-rank test was used to analyze differences in forward head posture and respiratory function within the groups before and after intervention. The significance level (α) was set to 0.05.
Results: A comparison of pre- and post-test measures showed that CVA significantly increased in the experimental group (p=0.001) denoting postural improvement, whereas no significant difference was found in the control group (p=0.053). All respiratory measures, i.e.,FVC, FVC %pred, FEV1, and FEV1 %pred, were significantly improved in the experimental group, whereas there were no significant differences in the control group.
Conclusions: McKenzie exercise can be effective in improving forward head posture and respiratory function.
Keywords : Exercise therapy, McKenzie exercise, Posture, Respiration, Respiratory function test

December 2019, 31 (6)
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