| Plasma lactate accumulation is reduced during incremental exercise in untrained women compared with untrained men. | |
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MedLine Citation:
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PMID: 17520272 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The lactate threshold (LT) is commonly reported as not different between sexes, yet lower blood lactate concentrations have been reported in women during submaximal exercise. The purpose of the present study was to measure the changes in plasma lactate concentration [La(-1)] in men and women during incremental cycle ergometer exercise using the same protocol and compare the data using several different methods of analysis. A group of untrained men (n = 21) and women (n = 22) were studied and venous blood drawn at regular intervals during and after exercise for assay of plasma [La(-1)]. Plasma [La(-1)] increased during exercise in both sexes, reaching higher values in men, both at exhaustion (men 8.6 +/- 2.3 mmol l(-1); women 6.2 +/- 2.3 mmol l(-1); P = 0.01) and post-exercise (men 11.8 +/- 2.1 mmol l(-1); women 10.2 +/- 2.4 mmol l(-1); P = 0.03). Logarithmic transformation of the data yielded LT values that were not different between sexes (men 44.2 +/- 12.9; women 50.2 +/- 12.6; %VO2peak; P = 0.45), yet both the 2 and 4 mmol l(-1) fixed concentration LT occurred at lower relative intensities in men (2 mmol l(-1): men 50.9 +/- 12.9; women 66.9 +/- 11.1; %VO2peak; P = 0.01). 4 mmol l(-1): men 75.7 +/- 11.0; women 90.6 +/- 9.2; VO2peak; P = 0.01). However, when the plasma [La(-1)] was examined in both sexes throughout exercise, using a single exponential function, plasma [La(-1)] was significantly lower in women (P < 0.05) at all relative intensities between 30 and 100%VO2peak. While the basis of this sex difference is unknown, reduced plasma [La(-1)] during submaximal exercise in women may offset to some degree the endurance performance disadvantage of their lower VO2peak. |
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Authors:
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Charli Sargent; Garry C Scroop |
Publication Detail:
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Type: Comparative Study; Journal Article Date: 2007-05-23 |
Journal Detail:
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Title: European journal of applied physiology Volume: 101 ISSN: 1439-6319 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2007 Sep |
Date Detail:
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Created Date: 2007-08-22 Completed Date: 2007-12-13 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 91-6 Citation Subset: IM |
Affiliation:
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Exercise Physiology Research Unit, Department of Physiology, University of Adelaide, Adelaide, SA, Australia. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anaerobic Threshold Carbon Dioxide / analysis Data Interpretation, Statistical Exercise / physiology* Exercise Test / statistics & numerical data Female Heart Rate Humans Lactates / blood* Male Middle Aged Oxygen Consumption / physiology Physical Endurance / physiology Physical Fitness Pulmonary Ventilation Running / physiology Sex Factors Weight-Bearing |
| Chemical | |
Reg. No./Substance:
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0/Lactates; 124-38-9/Carbon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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