| Blood lactate during recovery from intense exercise: impact of inspiratory loading. | |
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MedLine Citation:
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PMID: 18091015 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: It has long been suggested that inspiratory muscle activity may impact blood lactate levels ([Lac(-)]B) during the recovery from dynamic exercise. In this study, we tested the hypothesis that inspiratory muscle activation during recovery from intense exercise would contribute to La clearance, thus leading to reduced [Lac(-)]B. METHODS: Twelve healthy men underwent two maximal, incremental exercise tests on different days. During a 20-min inactive recovery period, they breathed freely or against a fixed inspiratory resistance of 15 cm H2O. During recovery, pulmonary gas exchange was continuously monitored, and serial samples of arterialized venous blood were obtained for [Lac(-)]B, pH, PCO2, and HCO3(-). RESULTS: Subjects presented similar ventilatory and gas-exchange responses at peak exercise during both experimental conditions. [Lac(-)]B during recovery was reduced with inspiratory resistance (7.7 +/- 1 vs 10.4 +/- 1, 7.8 +/- 2 vs 10.3 +/- 2, and 7.3 +/- 1 vs 9.7 +/- 2 mM at 5, 7, and 9 min of recovery, respectively; P < 0.05), but no differences were found for blood acid-base status. Inspiratory resistance was associated with increased metabolic demand (V O2 and V CO2) but improved ventilatory efficiency, with lower V E/[V CO2] and increased alveolar ventilation. CONCLUSION: These data are consistent with the notion that inspiratory muscles may be net consumers of lactate during recovery from intense exercise. |
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Authors:
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Gaspar R Chiappa; Bruno T Roseguini; Cristiano N Alves; Elton L Ferlin; J Alberto Neder; Jorge P Ribeiro |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 40 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2008 Jan |
Date Detail:
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Created Date: 2008-01-09 Completed Date: 2008-02-27 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 111-6 Citation Subset: IM; S |
Affiliation:
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Exercise Pathophysiology Research Laboratory, Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological* Adult Exercise / physiology* Exercise Test Humans Inspiratory Capacity / physiology* Lactic Acid / blood*, metabolism Male Oxygen Consumption / physiology* Prospective Studies Respiration* Time Factors Ventilation |
| Chemical | |
Reg. No./Substance:
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50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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