| Effects of acute hypoxia on the estimation of lactate threshold from ventilatory gas exchange indices during an incremental exercise test. | |
| | |
MedLine Citation:
|
PMID: 15588134 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The purpose of this study was to investigate the validity of non-invasive lactate threshold estimation using ventilatory and pulmonary gas exchange indices under condition of acute hypoxia. Seven untrained males (21.4+/-1.2 years) performed two incremental exercise tests using an electromagnetically braked cycle ergometer: one breathing room air and other breathing 12 % O2. The lactate threshold was estimated using the following parameters: increase of ventilatory equivalent for O2 (VE/VO2) without increase of ventilatory equivalent for CO2 (VE/VCO2). It was also determined from the increase in blood lactate and decrease in standard bicarbonate. The VE/VO2 and lactate increase methods yielded the respective values for lactate threshold: 1.91+/-0.10 l/min (for the VE/VO2) vs. 1.89+/-0.1 l/min (for the lactate). However, in hypoxic condition, VE/VO2 started to increase prior to the actual threshold as determined from blood lactate response: 1.67+/-0.1 l/min (for the lactate) vs. 1.37+/-0.09 l/min (for the VE/VO2) (P=0.0001), i.e. resulted in pseudo-threshold behavior. In conclusion, the ventilatory and gas exchange indices provide an accurate lactate threshold. Although the potential for pseudo-threshold behavior of the standard ventilatory and gas exchange indices of the lactate threshold must be concerned if an incremental test is performed under hypoxic conditions in which carotid body chemosensitivity is increased. |
| | |
Authors:
|
O Ozcelik; H Kelestimur |
Related Documents
:
|
2482714 - Simple kinetic model for the study of lactate metabolic adaptation to exercise in sport... 6469774 - Blood lactate and ammonium ion accumulation during graded exercise in humans. 21386064 - Effects of exercise on vldl-triglyceride oxidation and turnover. 8300264 - Transcutaneous pco2-monitoring for the evaluation of the anaerobic threshold. compariso... 21036024 - Cost-saving effect of supervised exercise associated to copd self-management education ... 16578994 - Inhalation injury after capsaicin exposure. |
Publication Detail:
|
Type: Clinical Trial; Journal Article; Randomized Controlled Trial; Validation Studies |
Journal Detail:
|
Title: Physiological research / Academia Scientiarum Bohemoslovaca Volume: 53 ISSN: 0862-8408 ISO Abbreviation: Physiol Res Publication Date: 2004 |
Date Detail:
|
Created Date: 2004-12-13 Completed Date: 2005-05-31 Revised Date: 2008-04-02 |
Medline Journal Info:
|
Nlm Unique ID: 9112413 Medline TA: Physiol Res Country: Czech Republic |
Other Details:
|
Languages: eng Pagination: 653-9 Citation Subset: IM |
Affiliation:
|
Department of Physiology, Firat University, Faculty of Medicine, Elazig, Turkey. oozcelik@firat.edu.tr |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Acute Disease Adult Anaerobic Threshold* Anoxia / physiopathology* Exercise Test / methods* Humans Lactic Acid / blood* Male Oxygen Consumption* Pulmonary Gas Exchange* Reproducibility of Results Sensitivity and Specificity Statistics as Topic |
| Chemical | |
Reg. No./Substance:
|
50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Dipyridamole inhibits hydroxylamine augmented nitric oxide (NO) production by activated polymorphonu...
Next Document: Changes of dopamine-beta-hydroxylase activity during ontogenesis in healthy subjects and in an exper...