Document Detail

Blood lactate during recovery from intense exercise: impact of inspiratory loading.
MedLine Citation:
PMID:  18091015     Owner:  NLM     Status:  MEDLINE    
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.
Gaspar R Chiappa; Bruno T Roseguini; Cristiano N Alves; Elton L Ferlin; J Alberto Neder; Jorge P Ribeiro
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
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:
Created Date:  2008-01-09     Completed Date:  2008-02-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  111-6     Citation Subset:  IM; S    
Exercise Pathophysiology Research Laboratory, Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil.
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MeSH Terms
Adaptation, Physiological*
Exercise / physiology*
Exercise Test
Inspiratory Capacity / physiology*
Lactic Acid / blood*,  metabolism
Oxygen Consumption / physiology*
Prospective Studies
Time Factors
Reg. No./Substance:
50-21-5/Lactic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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