Document Detail

Aerobic fitness influences the response of maximal oxygen uptake and lactate threshold in acute hypobaric hypoxia.
MedLine Citation:
PMID:  7751080     Owner:  NLM     Status:  MEDLINE    
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 3000m (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 normobaria (VO2maxnorm) and 46.6 +/- 4.9 (SD) ml/kg/min in hypobaric hypoxia (VO2maxhyp). The decrease in maximal oxygen uptake (delta VO2max) at the simulated altitude of 3000m correlated significantly (p < 0.05, r = 0.61) to the maximal oxygen uptake in normobaric conditions (VO2maxnorm). The lactate threshold was 43.5 +/- 6.4 (SD) ml/kg/min in normobaria (VO2LTnorm) and 36.5 +/- 4.2 (SD) ml/kg/min in hypobaric hypoxia (VO2LThyp). The decrement (delta VO2LT) of lactate threshold in hypoxia correlated significantly (p < 0.01, r = 0.68) with the lactate threshold in normobaric conditions (VOLTnorm). Thus we observed the largest reduction of both maximal oxygen uptake and lactate threshold during exercise at hypobaric hypoxia in the most fit athletes.
P Koistinen; T Takala; V Martikkala; J Leppäluoto
Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  International journal of sports medicine     Volume:  16     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  1995 Feb 
Date Detail:
Created Date:  1995-06-22     Completed Date:  1995-06-22     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  78-81     Citation Subset:  IM; S    
Health Centre Hospital of Oulu, Finland.
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MeSH Terms
Acute Disease
Anaerobic Threshold / physiology*
Anoxia / blood,  physiopathology*
Exercise Test
Heart Rate / physiology
Hockey / physiology
Lactates / blood*
Oxygen / blood
Oxygen Consumption / physiology*
Physical Fitness / physiology*
Respiration / physiology
Skiing / physiology
Ventilation-Perfusion Ratio
Reg. No./Substance:
0/Lactates; 7782-44-7/Oxygen

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