Research Article

A Randomized Clinical Trial: Immediate Respiratory Warm-Up Effect on Dynamic Inspiratory Muscle Strength in Cardiac Surgery Candidates

Abstract

Background: The strength of inspiratory muscles is one of the important factors in preventing postoperative pulmonary complications (POPC). One of the new tools to safely measure the strength of the inspiratory muscles in heart patients, in a dynamic manner and without breath holding, is the use of strength-index (s-index).
Objective: This study aims to evaluate the immediate effects of a respiratory warm-up (RWU) session on the S-index and other lung parameters in cardiac surgery candidates, a subject with limited existing research.
Material & Methods: This study was conducted as a randomized controlled trial. Forty participants scheduled for heart surgeries were randomly assigned to either the study (RWU between two tests) or control (without RWU) groups. RWU consists of threshold loading inspiratory muscle training (TL-IMT) exercises, at 30% of S-index with 30 breathing cycles. Respiratory tests, including S-index, peak inspiratory flow (PIF), and vital capacity (VC), were assessed two times with using an electronic respiratory device (Power Breath K5).
Results: Covariance analysis showed no significant difference in the average and best values of the S-index, PIF, or VC indices, at the second tests, between two groups (P>.05), or in the independent T-test and Mann-Whitney U test for the “rate of changes”, between two tests (P>.05). Finally, intra-group changes, assessed with paired sample T-test between two tests, were mostly non-significant for these indices (P>.05), except for the Best Vital Capacity in the study group (P=.03).
Conclusions: The study results suggest that a respiratory warm-up session does not significantly impact the S-index or other respiratory parameters in cardiac surgery candidates. Thus, incorporating RWU before S-index testing may not be necessary.

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IssueArticles in Press QRcode
SectionResearch Article(s)
Keywords
Dynamic respiratory pressure, Warm-up, Cardiac disease
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1.
MehreganFar B, Naimi SS, Abedi M, Raeis Sadat SA, Beheshti Monfared M, Akbarzadeh Baghban A. A Randomized Clinical Trial: Immediate Respiratory Warm-Up Effect on Dynamic Inspiratory Muscle Strength in Cardiac Surgery Candidates. jmr. 2024;(-).