The effect of preexercise expiratory muscle loading on exercise tolerance in healthy men

Hardy, Tim A., How, Stephen C ORCID: 0000-0003-2962-3570 and Taylor, Bryan J (2021) The effect of preexercise expiratory muscle loading on exercise tolerance in healthy men. Medicine and Science in Sports and Exercise, 53 (2). pp. 421-430. doi:10.1249/MSS.0000000000002468

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Purpose Acute non-fatiguing inspiratory muscle loading transiently increases diaphragm excitability and global inspiratory muscle strength, and may improve subsequent exercise performance. We investigated the effect of acute expiratory muscle loading on expiratory muscle function and exercise tolerance in healthy men. Methods Ten males cycled at 90% of peak power output to the limit of tolerance (TLIM) after: 1) 2 × 30 expiratory efforts against a pressure-threshold load of 40% maximal expiratory gastric pressure (PgaMAX) (EML-EX); and 2) 2 × 30 expiratory efforts against a pressure-threshold load of 10% PgaMAX (SHAM-EX). Changes in expiratory muscle function were assessed by measuring the mouth pressure (PEMAX) and PgaMAX responses to maximal expulsive efforts, and magnetically evoked (1-Hz) gastric twitch pressure (Pgatw). Results Expiratory loading at 40% of PgaMAX increased PEMAX (10 ± 5%, P = 0.001) and PgaMAX (9 ± 5%, P = 0.004). Conversely, there was no change in PEMAX (166 ± 40 vs. 165 ± 35 cmH2O, P = 1.000) or PgaMAX (196 ± 38 vs. 192 ± 39 cmH2O, P = 0.215) from before to after expiratory loading at 10% of PgaMAX. Exercise time was not different in EML-EX vs. SHAM-EX (7.91 ± 1.96 vs. 8.09 ± 1.77 min, 95% CI = −1.02 to 0.67, P = 0.651). Similarly, exercise-induced expiratory muscle fatigue was not different in EML-EX vs. SHAM-EX (−28 ± 12 vs. −26 ± 7% reduction in Pgatw amplitude, P = 0.280). Perceptual ratings of dyspnea and leg discomfort were not different during EML-EX vs. SHAM-EX. Conclusion Acute expiratory muscle loading enhances expiratory muscle function but does not improve subsequent severe-intensity exercise tolerance in healthy men.

Item Type: Article
Article Type: Article
Uncontrolled Keywords: Expiratory muscle warm-up; Gastric twitch pressure; Expiratory muscle fatigue; Exertional dyspnea and leg discomfort; Exercise performance
Subjects: Q Science > QP Physiology > QP301.H75 Physiology. Sport
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Schools and Research Institutes > School of Education and Science
Research Priority Areas: Health, Life Sciences, Sport and Wellbeing
Depositing User: Rhiannon Goodland
Date Deposited: 26 Aug 2020 14:10
Last Modified: 04 Jan 2024 13:03

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