Concurrent Heat and Intermittent Hypoxic Training: No Additional Performance Benefit Over Temperate Training
| Autor: | Aaron J. Coutts, Erin L McCleave, Stephen Crowcroft, Katie M. Slattery, Lee Wallace, Rob Duffield, Chris R. Abbiss |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Chemistry
Physical Therapy Sports Therapy and Rehabilitation Blood volume 030229 sport sciences 030204 cardiovascular system & hematology Hypoxia (medical) Acclimatization Confidence interval Interval training 03 medical and health sciences 0302 clinical medicine Animal science Fraction of inspired oxygen medicine Orthopedics and Sports Medicine Relative humidity medicine.symptom Intermittent hypoxic training |
| Zdroj: | International Journal of Sports Physiology and Performance. 15:1260-1271 |
| ISSN: | 1555-0273 1555-0265 |
| DOI: | 10.1123/ijspp.2019-0277 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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