Document Detail

Exercise with the intensity of the individual anaerobic threshold in acute hypoxia.
MedLine Citation:
PMID:  15595295     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The aim of the present study was to find out if the determination of the individual anaerobic threshold (IAT) during incremental treadmill tests in normoxia and acute normobaric hypoxia (FiO2 0.15) defines equivalent relative submaximal intensities in these environmental conditions. METHODS: 11 male middle and long distance runners performed a 1-h treadmill run in normoxia and hypoxia at the intensity of the IAT determined in the respective environment with measurement of lactate, glucose, heart rate, catecholamines, ventilatory parameters, and rate of perceived exertion (RPE). RESULTS: During the 1-h treadmill runs, speed was significantly reduced in hypoxia compared with normoxia (12.8 +/- 0.7 vs 14.7 +/- 0.7 km x h(-1)). Relative intensity expressed as a percentage of VO(2max) was similar in both environments (82-83% on the average) and elicited comparable lactate steady states [LaSS, 2.5 +/- 0.7 - 3.4 +/- 1.1 mmol x L(-1) (normoxia), 2.7 +/- 0.8 - 3.6 +/- 1.0 mmol x L(-1) (hypoxia) after 10 and 60 min, respectively] and glucose levels, but significantly reduced heart rate in hypoxia by 5 beats x min(-1) on the average. A steady state was also found for the ventilatory parameters. Plasma epinephrine and norepinephrine levels were similar in both environments. RPE was significantly lower after 40-60 min of exercise in hypoxia. CONCLUSIONS: Relative intensities in normoxia and acute hypoxia are equivalent when endurance exercise is performed with the running speed at the IAT determined in the respective environment. The heart rate-blood lactate relationship, however, is changed in hypoxia and relative submaximal exercise intensity is higher in acute hypoxia when training is performed with similar heart rate as in normoxia.
Birgit Friedmann; Timm Bauer; Elmar Menold; Peter Bärtsch
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  36     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-12-14     Completed Date:  2005-02-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1737-42     Citation Subset:  IM; S    
Department of Sports Medicine, Medical Clinic and Policlinic, University of Heidelberg, Germany.
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MeSH Terms
Anaerobic Threshold / physiology*
Anoxia / blood*,  physiopathology*
Blood Glucose / analysis
Epinephrine / blood
Exercise / physiology*
Exercise Test
Heart Rate / physiology
Lactic Acid / blood
Norepinephrine / blood
Oxygen / blood
Oxygen Consumption / physiology
Plasma Volume
Pulmonary Gas Exchange / physiology
Reg. No./Substance:
0/Blood Glucose; 50-21-5/Lactic Acid; 51-41-2/Norepinephrine; 51-43-4/Epinephrine; 7782-44-7/Oxygen

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