Title
Concurrent heat and intermittent hypoxic training: No additional performance benefit over temperate training
Document Type
Journal Article
Publication Title
International Journal of Sports Physiology and Performance
ISSN
15550265
Volume
15
Issue
9
First Page
1260
Last Page
1271
Publisher
Human Kinetics Publishers Inc
School
School of Medical and Health Sciences
RAS ID
35341
Abstract
© 2020 Human Kinetics, Inc. Purpose: To examine whether concurrent heat and intermittent hypoxic training can improve endurance performance and physiological responses relative to independent heat or temperate interval training. Methods: Well-trained male cyclists (N = 29) completed 3 weeks of moderate- to high-intensity interval training (4 × 60 min·wk−1) in 1 of 3 conditions: (1) heat (HOT: 32°C, 50% relative humidity, 20.8% fraction of inspired oxygen, (2) heat + hypoxia (H+H: 32°C, 50% relative humidity, 16.2% fraction of inspired oxygen), or (3) temperate environment (CONT: 22°C, 50% relative humidity, 20.8% fraction of inspired oxygen). Performance 20-km time trials (TTs) were conducted in both temperate (TTtemperate) and assigned condition (TTenvironment) before (base), immediately after (mid), and after a 3-week taper (end). Measures of hemoglobin mass, plasma volume, and blood volume were also assessed. Results: There was improved 20-km TT performance to a similar extent across all groups in both TTtemperate (mean ±90% confidence interval HOT, −2.8% ±1.8%; H+H, −2.0% ±1.5%; CONT, −2.0% ±1.8%) and TTenvironment (HOT, −3.3% ±1.7%; H+H, −3.1% ±1.6%; CONT, −3.2% ±1.1%). Plasma volume (HOT, 3.8% ±4.7%; H+H, 3.3% ±4.7%) and blood volume (HOT, 3.0% ±4.1%; H+H, 4.6% ±3.9%) were both increased at mid in HOT and H+H over CONT. Increased hemoglobin mass was observed in H+H only (3.0% ±1.8%). Conclusion: Three weeks of interval training in heat, concurrent heat and hypoxia, or temperate environments improve 20-km TT performance to the same extent. Despite indications of physiological adaptations, the addition of independent heat or concurrent heat and hypoxia provided no greater performance benefits in a temperate environment than temperate training alone.
DOI
10.1123/IJSPP.2019-0277
Access Rights
subscription content
Research Themes
Society and Culture
Priority Areas
Human movement and performance
Comments
McCleave, E. L., Slattery, K. M., Duffield, R., Crowcroft, S., Abbiss, C. R., Wallace, L. K., & Coutts, A. J. (2020). Concurrent heat and intermittent hypoxic training: No additional performance benefit over temperate training. International Journal of Sports Physiology and Performance, 15(9), 1260-1271. https://doi.org/10.1123/IJSPP.2019-0277