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Physiological characteristics of elite high‐altitude climbers
Author(s) -
Puthon L.,
Bouzat P.,
Rupp T.,
Robach P.,
FavreJuvin A.,
Verges S.
Publication year - 2016
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.12547
Subject(s) - hypoxic ventilatory response , cardiorespiratory fitness , hypoxia (environmental) , effects of high altitude on humans , oxygenation , altitude training , medicine , cardiology , vo2 max , respiratory minute volume , incremental exercise , climbing , ventilatory threshold , ventilation (architecture) , heart rate , anesthesia , altitude (triangle) , respiration , oxygen , physical therapy , respiratory system , chemistry , biology , anatomy , blood pressure , mathematics , mechanical engineering , ecology , geometry , organic chemistry , engineering , athletes
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, VO 2 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 VO 2 max (climbers −39 ± 7% vs controls −39 ± 9%), maximal power output (−27 ± 5% vs −26 ± 4%), and arterial oxygen saturation ( S p O 2 ). However, climbers had lower hypoxic ventilatory response during exercise (1.7 ± 0.5 vs 2.6 ± 0.7 L/min/%; P < 0.05) and lower hypercapnic ventilatory response (1.8 ± 1.4 vs 3.8 ± 2.5 mL/min/mmHg; P < 0.05). Finally, climbers exhibited slower breathing frequency, larger tidal volume and larger muscle oxygenation index. These results suggest that elite climbers show some specific ventilatory and muscular responses to hypoxia possibly because of genetic factors or adaptation to frequent high‐altitude climbing.