Document Detail

Validity of a single-visit protocol to estimate the maximum lactate steady state.
MedLine Citation:
PMID:  16260974     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: The maximum lactate steady state (MLSS) represents the highest intensity of exercise at which a balance exists between the rate of lactate production and the rate of lactate clearance. The MLSS is an important determinant of endurance exercise performance but its determination, which involves 4-5 laboratory visits, is labor-intensive and time consuming. PURPOSE: To compare the MLSS estimated from a single-visit protocol (MLSSsingle) with the traditional, directly measured MLSS (MLSStrad). METHODS: Following an incremental treadmill test for the determination of VO2peak, eight endurance-trained runners completed: 1) a series of 4-5 constant-speed treadmill runs of up to 30-min duration, on separate days, for determination of the MLSStrad; and 2) a single-visit protocol consisting of two constant-speed treadmill runs of 20-min duration at approximately 65 and 90% VO2peak separated by 40 min of rest, for determination of MLSSsingle. Blood lactate concentration ([La]), oxygen uptake (VO2), and heart rate (HR) were measured every 5 min in all treadmill runs. Comparisons between values were made using paired t-tests. RESULTS: The MLSSsingle significantly underestimated the MLSStrad with respect to speed (13.4 +/- 1.2 vs 16.4 +/- 1.6 km x h(-1), P = 0.002), HR (148 +/- 8 vs 170 +/- 10 b x min(-1), P < 0.001), blood [La] (2.3 +/- 1.5 vs 3.9 +/- 1.0 mmol x L(-1); P = 0.01), and % VO2peak utilized (75 +/- 8 vs 90 +/- 2%, P = 0.002). The MLSStrad speed and MLSSsingle speed were poorly correlated (r = 0.29, P = 0.49). CONCLUSION: The single-visit method of determining the MLSS substantially underestimates the actual MLSS.
Andrew E Kilding; Andrew M Jones
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  37     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-11-01     Completed Date:  2006-01-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1734-40     Citation Subset:  IM; S    
Division of Sport and Recreation, Faculty of Health and Environmental Sciences, Auckland University of Technology, New Zealand.
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MeSH Terms
Exercise / physiology*
Exercise Test
Heart Rate / physiology
Lactic Acid / blood*
Oxygen Consumption
Running / physiology*
Reg. No./Substance:
50-21-5/Lactic Acid

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