Aerobic fitness influences the response of maximal oxygen uptake and lactate threshold in acute hypobaric hypoxia

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Deutscher übersetzter Titel:Aerobe Fitness beeinflusst die Reaktion der maximalen Sauerstoffaufnahme und der Laktatschwelle auf akute hypobare Hypoxie
Autor:Koistinen, P.; Takala, T.; Martikkala, V.; Leppaeluoto, J.
Erschienen in:International journal of sports medicine
Veröffentlicht:16 (1995), 2, S. 78-81, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:0172-4622, 1439-3964
DOI:10.1055/s-2007-972968
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Erfassungsnummer:PU199509102835
Quelle:BISp

Abstract des Autors

We studied 12 highly trained athletes, 6 male ice-hockey players and 6 cross-country skiers (2 females, 4 males). All of them participated in a maximal electrically braked bicycle ergometer test in a hypobaric chamber at the simulated altitude of 3000 m (520 mmHg) and in normobaric conditions two days apart in random order. The maximal oxygen uptake was 57.4 +/- 7.1 (SD) ml/kg/min in normobaric (VO2max norm) and 46.6 +/- 4.9 (SD) ml/kg/min in hypobaric hypoxia (VO2max hyp). The decrease in maximal oxygen uptake (delta VO2max) at the simulated altitude of 3000 m correlated significantly (p<0.05, r=0.61) to the maximal oxygen uptake in normobaric conditions (VO2max norm). The lactate threshold was 43.5 +/- 6.4 (SD) ml/kg/min in normobaria (VO2-LT norm) and 36.5 +/- 4.2 (SD) ml/kg/min in hypobaric hypoxia (VO2-LT hyp). The decrement (delta VO2-LT) of lactate threshold in hypoxia correlated significantly (p<0.01, r = 0.68) with the lactate threshold in normobaric conditions (VO-LT norm). Thus we observed the largest reduction of both maximal oxygen uptake and lactate threshold during exercise at hypobaric hypoxia in the most fit athletes. Verf.-Referat