Hardy, T.A., How, S.C. and Taylor, B.J. (2021) The Effect of Preexercise Expiratory Muscle Loading on Exercise Tolerance in Healthy Men. Medicine & Science in Sports & Exercise, 53 (2). pp. 421-430. ISSN 0195-9131
Abstract
Purpose
Acute nonfatiguing 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 cm H2O, P = 1.000) or PgaMAX (196 ± 38 vs 192 ± 39 cm H2O, P = 0.215) from before to after expiratory loading at 10% of PgaMAX. Exercise time was not different in EML-EX versus 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 versus 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 versus SHAM-EX.
Conclusion
Acute expiratory muscle loading enhances expiratory muscle function but does not improve subsequent severe-intensity exercise tolerance in healthy men.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is an author produced version of an article accepted for publication in Medicine & Science in Sports & Exercise. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Expiratory muscle warm-up; gastric twitch pressure; expiratory muscle fatigue; exertional dyspnea and leg discomfort; exercise performance |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | ?? Leeds.RC-BIOL ?? The University of Leeds > Faculty of Medicine and Health (Leeds) > School of Medicine (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 30 Apr 2025 14:22 |
Last Modified: | 30 Apr 2025 14:22 |
Status: | Published |
Publisher: | Wolters Kluwer |
Identification Number: | 10.1249/mss.0000000000002468 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:225962 |