[Control of ventilation and aerobic work capacity in elite climbers].
Hypoxic ventilatory response (HVR), hypercapnic ventilatory response (HCVR), and maximal oxygen uptake (VO2max) were measured in elite male climbers (Clim.: n = 4) and physically active controls (Con.: n = 8). Although mean value of S, an index of HCVR, showed almost the same values in both groups (Clim.: 2.26 +/- 0.62 vs. Con.: 1.85 +/- 0.58 l.min-1.Torr-1), mean value of A, an index of HVR, was significantly higher in climbers than controls (Clim.: 237.8 +/- 109.2 vs. Con.: 111.3 +/- 62.0 l.min-1.Torr-1). Mean value of VO2max in climbers was not different from that in controls (Clim.: 49.3 +/- 2.9 vs. Con.: 47.5 +/- 5.7 ml.kg-1.min-1). These results demonstrate that elite climbers are characterized by their enhanced ventilatory response to hypoxia rather than prominency in aerobic work capacity. It is speculated that enhanced HVR in climbers makes compensation for decreased VO2max at high altitude. The enhanced HVR in elite climbers who have ordinary values in VO2max may be one of factors in their successful performance at extreme altitude.
Takahashi
H
H
Faculty of Integrated Arts and Sciences, Hiroshima Univ., Japan.
Asano
K
K
Kikuchi
K
K
D000328:Adult; D006801:Humans; D000860:Hypoxia / Q000503:physiopathology; D008297:Male; D009051:Mountaineering; D010100:Oxygen / Q000378:metabolism*; D005082:Physical Exertion; D012119:Respiration
D010100:Oxygen