Document Detail

Inspiratory loading intensity does not influence lactate clearance during recovery.
MedLine Citation:
PMID:  22089476     Owner:  NLM     Status:  MEDLINE    
PURPOSE: This study examined the effects of different pressure threshold inspiratory loads on lactate clearance and plasma acid-base balance during recovery from maximal exercise.
METHODS: Eight moderately trained males (V˙O(2peak) = 4.29 ± 0.46 L·min⁻¹) performed, on different days, four maximal incremental cycling tests (power started at 0 W and increased by 20 W·min⁻¹) of identical duration (exercise time during the first trial was 16.32 ± 1.12 min). During 20-min recovery, subjects either rested passively or breathed through a constant pressure threshold inspiratory load of 10 (ITL10), 15 (ITL15), or 20 (ITL20) cm H2O. Plasma lactate concentration ([La⁻]) was measured, and acid-base balance was quantified using the physicochemical approach, which describes the dependency of [H⁺] on the three independent variables: strong ion difference ([Na⁺] + [K⁺] - [Cl⁻] + [La⁻]), the total concentration of weak acids, and the partial pressure of carbon dioxide.
RESULTS: Peak exercise responses were not significantly different between trials. During recovery, the area under the plasma [La] curve was not different between trials (pooled mean = 261 ± 60 mEq) and the [La] measured at the end of the 20-min recovery was also similar (passive recovery = 9.2 ± 3.1 mEq·L⁻¹, ITL10 = 9.3 ± 3.1 mEq·L⁻¹, ITL15 = 8.7 ± 2.8 mEq·L⁻¹, ITL20 = 8.7 ± 3.2 mEq·L⁻¹). Similarly, changes in other strong ions contributing to strong ion difference and total concentration of weak acids, partial pressure of carbon dioxide, and, therefore, [H⁺] were not different between trials.
CONCLUSIONS: These data suggest that, in individuals of moderate endurance training status, inspiratory loading at the intensities used in the present study does not accelerate lactate clearance or modify plasma acid-base balance during recovery from maximal exercise.
Michael A Johnson; Dean E Mills; David M Brown; Katie J Bayfield; Javier T Gonzalez; Graham R Sharpe
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  44     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-04-17     Completed Date:  2012-08-20     Revised Date:  2013-01-31    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  863-71     Citation Subset:  IM; S    
Sport, Health and Performance Enhancement Research Group, School of Science and Technology, Nottingham Trent University, Clifton, Nottingham, United Kingdom.
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MeSH Terms
Acidosis, Lactic / prevention & control
Area Under Curve
Bicycling / physiology*
Breathing Exercises
Exercise Test
Hydrogen-Ion Concentration
Lactic Acid / blood*
Oxygen Consumption / physiology
Respiratory Function Tests
Rest / physiology*
Reg. No./Substance:
50-21-5/Lactic Acid
Comment In:
Med Sci Sports Exerc. 2013 Jan;45(1):212-3   [PMID:  23247673 ]
Med Sci Sports Exerc. 2013 Jan;45(1):214-5   [PMID:  23247674 ]

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

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