PNF and Movement 2024; 22(3): 407-414
https://doi.org/10.21598/JKPNFA.2024.22.3.407
Effect of the Application of Respiratory Resistance Training on the Vocalization and Cough Ability of Patients with Cervical Spinal Cord Injury with Respiratory Failure
Yong-Guk Lee, P.T., M.Sc.1⋅Byeong-Jo Kim, P.T., Ph.D.2†⋅Gwan-Hyeok Go, P.T., M.Sc.3
1Department of Physical Therapy, Haeundae Sharing and Happiness Hospital
2Department of Physical Therapy, College of Nersing and Healthcare Sciences, Dong-Eui University
3Department of Physical Therapy, Parkside Rehabilitation Hospital
Correspondence to: †Byeong-Jo Kim (pt123@deu.ac.kr)
Received: November 5, 2024; Revised: November 17, 2024; Accepted: November 18, 2024; Published online: December 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: The aim of this study was to examine the effects of respiratory muscle resistance training on cough capacity and phonation in patients with cervical spinal cord injuries. The goal was to determine whether inspiratory or expiratory muscle training could effectively improve respiratory and phonatory functions.
Methods: Eighteen patients with cervical spinal cord injuries participated in this study. They were randomly assigned to two groups: an inspiratory muscle training group and an expiratory muscle training group. Both groups underwent six weeks of resistance training using an integrated threshold resistance device. The key outcomes measured were peak expiratory flow (PEF), maximum phonation time (MPT), and vocal intensity (dB). A Wilcoxon signed-rank test was used to analyze the pre- and post-intervention differences, with statistical significance set at p < .05.
Results: The results showed significant improvements in PEF, MPT, and dB in both the inspiratory and expiratory muscle training groups after the intervention. However, there were no significant differences between the two groups in terms of improvement. This indicates that both types of muscle training effectively improve cough capacity and phonation in cervical spinal cord injury patients.
Conclusion: Inspiratory and expiratory muscle resistance training are equally effective methods for enhancing respiratory and phonatory functions in patients with cervical spinal cord injuries. These findings suggest that either type of training can be incorporated into rehabilitation programs for these patients to improve their quality of life.
Keywords: Breathing exercises, Spinal cord injuries, Cough, Phonation

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