Physiological characteristics of elite high-altitude climbers
| Autor: | Thomas Rupp, Paul Robach, L Puthon, A. Favre-Juvin, Pierre Bouzat, Samuel Verges |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
medicine.medical_specialty
Respiratory rate business.industry VO2 max Physiology Physical Therapy Sports Therapy and Rehabilitation Cardiorespiratory fitness 030229 sport sciences Hypoxic ventilatory response Oxygenation 030204 cardiovascular system & hematology Hypoxia (medical) Effects of high altitude on humans 03 medical and health sciences 0302 clinical medicine Internal medicine medicine Cardiology Orthopedics and Sports Medicine medicine.symptom business Tidal volume |
| Zdroj: | Scandinavian Journal of Medicine & Science in Sports. 26:1052-1059 |
| ISSN: | 0905-7188 |
| DOI: | 10.1111/sms.12547 |
| Popis: | Factors underlying the amplitude of exercise performance reduction at altitude and the development of high-altitude illnesses are not completely understood. To better describe these mechanisms, we assessed cardiorespiratory and tissue oxygenation responses to hypoxia in elite high-altitude climbers. Eleven high-altitude climbers were matched with 11 non-climber trained controls according to gender, age, and fitness level (maximal oxygen consumption, VO2 max ). Subjects performed two maximal incremental cycling tests, in normoxia and in hypoxia (inspiratory oxygen fraction: 0.12). Cardiorespiratory measurements and tissue (cerebral and muscle) oxygenation were assessed continuously. Hypoxic ventilatory and cardiac responses were determined at rest and during exercise; hypercapnic ventilatory response was determined at rest. In hypoxia, climbers exhibited similar reductions to controls in VO2 max (climbers -39 ± 7% vs controls -39 ± 9%), maximal power output (-27 ± 5% vs -26 ± 4%), and arterial oxygen saturation (SpO2 ). However, climbers had lower hypoxic ventilatory response during exercise (1.7 ± 0.5 vs 2.6 ± 0.7 L/min/%; P |
| Databáze: | OpenAIRE |
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