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BMC Sports Science, Medicine and Rehabilitation
Published in: BMC Sports Science, Medicine and Rehabilitation 1/2023

Open Access 01-12-2023 | Research article

Impact of high intensity interval exercise with and without heat stress on cardiovascular and aerobic performance: a pilot study

Authors: Alexs A. Matias, Isabelle F. Albin, Leah Glickman, Peter A. Califano, Justin M. Faller, Gwenael Layec, Stephen J. Ives

Published in: BMC Sports Science, Medicine and Rehabilitation | Issue 1/2023

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Abstract

Background

Heat stress during aerobic exercise training may offer an additional stimulus to improve cardiovascular function and performance in a cool-temperate environment. However, there is a paucity of information on the additive effects of high-intensity interval exercise (HIIE) and acute heat stress. We aimed to determine the effects of HIIE in combination with acute heat stress on cardiovascular function and exercise performance.

Methods

Twelve active (peak O2 consumption [VO2peak]: 47 ± 8 ml·O2/min/kg) young adults were counterbalanced to six sessions of HIIE in hot (HIIE-H, 30 ± 1 °C, 50 ± 5% relative humidity [RH]) or temperate conditions (HIIE-T, 20 ± 2 °C, 15 ± 10% RH). Resting heart rate (HR), HR variability (HRV), central (cBP) and peripheral blood pressure (pBP), peripheral mean arterial pressure (pMAP), pulse wave velocity (PWV), VO2peak, and 5-km treadmill time-trial were measured pre- and post-training.

Results

Resting HR and HRV were not significantly different between groups. However, expressed as percent change from baseline, cSBP (HIIE-T: + 0.9 ± 3.6 and HIIE-H: -6.6 ± 3.0%, p = 0.03) and pSBP (HIIE-T: -2.0 ± 4.6 and HIIE-H: -8.4 ± 4.7%, p = 0.04) were lower in the heat group. Post-training PWV was also significantly lower in the heat group (HIIE-T: + 0.4% and HIIE-H: -6.3%, p = 0.03). Time-trial performance improved with training when data from both groups were pooled, and estimated VO2peak was not significantly different between groups (HIIE-T: 0.7% and HIIE-H: 6.0%, p = 0.10, Cohen’s d = 1.4).

Conclusions

The addition of acute heat stress to HIIE elicited additive adaptations in only cardiovascular function compared to HIIE alone in active young adults in temperate conditions, thus providing evidence for its effectiveness as a strategy to amplify exercise-induced cardiovascular adaptations.
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Metadata
Title
Impact of high intensity interval exercise with and without heat stress on cardiovascular and aerobic performance: a pilot study
Authors
Alexs A. Matias
Isabelle F. Albin
Leah Glickman
Peter A. Califano
Justin M. Faller
Gwenael Layec
Stephen J. Ives
Publication date
01-12-2023
Publisher
BioMed Central
Published in
BMC Sports Science, Medicine and Rehabilitation / Issue 1/2023
Electronic ISSN: 2052-1847
DOI
https://doi.org/10.1186/s13102-023-00682-8

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