| Acid-base balance during repeated cycling sprints in boys and men. | |
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MedLine Citation:
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PMID: 11796654 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The aim of this study was to investigate the acid-base balance during repeated cycling sprints in children and adults. Eleven boys (9.6 +/- 0.7 yr) and ten men (20.4 +/- 0.8 yr) performed ten 10-s sprints on a cycle ergometer separated by 30-s passive recovery intervals. To measure the time course of lactate ([La]), hydrogen ions ([H(+)]), bicarbonate ions ([HCO(3)(-)]), and base excess concentrations and the arterial partial pressure of CO(2), capillary blood samples were collected at rest and after each sprint. Ventilation and CO(2) output were continuously measured. After the 10th sprint, concentrations of boys vs. men were as follows: [La], 8.5 +/- 2.1 vs. 15.4 +/- 2.0 mmol/l; [H(+)], 43.8 +/- 1.3 vs. 66.9 +/- 9.9 nmol/l (P < 0.001). Significant correlations showed that, for a given [La], [H(+)] was lower in the boys compared with the men (P < 0.001). Significant relationships also indicated that, for a given [La], [HCO(3)(-)] and base excess concentration were similar in the boys compared with the men. Moreover, significant relationships revealed that, for a given [H(+)] or [HCO(3)(-)], arterial partial pressure of CO(2) was lower in the boys compared with the men (P < 0.001). The ventilation-to-CO(2) output ratio was higher in the boys during the first five rest intervals and was then higher in the men during the last five sprints. To conclude, during repeated sprints, the ventilatory regulation related to the change in acid-base balance induced by lactic acidosis was more important during the first rest intervals in the boys compared with the men. |
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Authors:
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S Ratel; P Duche; A Hennegrave; E Van Praagh; M Bedu |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 92 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2002 Feb |
Date Detail:
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Created Date: 2002-01-17 Completed Date: 2002-04-08 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 479-85 Citation Subset: IM |
Affiliation:
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Laboratoire Interuniversitaire de Biologie des Activités Physiques et Sportives, F-63001 Clermont-Ferrand, France. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acid-Base Equilibrium* Adult Aging / metabolism* Arteries Bicarbonates / blood Bicycling / physiology* Blood / metabolism Carbon Dioxide / blood Child Humans Hydrogen-Ion Concentration Lactic Acid / blood Male Partial Pressure Pulmonary Gas Exchange |
| Chemical | |
Reg. No./Substance:
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0/Bicarbonates; 124-38-9/Carbon Dioxide; 50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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