Document Detail


Maximal lactate steady state in trained adolescent runners.
MedLine Citation:
PMID:  14998099     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aims of this study were: (1) to identify the exercise intensity that corresponds to the maximal lactate steady state in adolescent endurance-trained runners; (2) to identify any differences between the sexes; and (3) to compare the maximal lactate steady state with commonly cited fixed blood lactate reference parameters. Sixteen boys and nine girls volunteered to participate in the study. They were first tested using a stepwise incremental treadmill protocol to establish the blood lactate profile and peak oxygen uptake (VO2). Running speeds corresponding to fixed whole blood lactate concentrations of 2.0, 2.5 and 4.0 mmol x l(-1) were calculated using linear interpolation. The maximal lactate steady state was determined from four separate 20-min constant-speed treadmill runs. The maximal lactate steady state was defined as the fastest running speed, to the nearest 0.5 km x h(-1), where the change in blood lactate concentration between 10 and 20 min was < 0.5 mmol x l(-1). Although the boys had to run faster than the girls to elicit the maximal lactate steady state (15.7 vs 14.3 km x h(-1), P < 0.01), once the data were expressed relative to percent peak VO2 (85 and 85%, respectively) and percent peak heart rate (92 and 94%, respectively), there were no differences between the sexes (P > 0.05). The running speed and percent peak VO2 at the maximal lactate steady state were not different to those corresponding to the fixed blood lactate concentrations of 2.0 and 2.5 mmol x l(-1) (P > 0.05), but were both lower than those at the 4.0 mmol x l(-1) concentration (P < 0.05). In conclusion, the maximal lactate steady state corresponded to a similar relative exercise intensity as that reported in adult athletes. The running speed, percent peak VO2 and percent peak heart rate at the maximal lactate steady state are approximated by the fixed blood lactate concentration of 2.5 mmol x l(-1) measured during an incremental treadmill test in boys and girls.
Authors:
Omar Ali Almarwaey; Andrew Mark Jones; Keith Tolfrey
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of sports sciences     Volume:  22     ISSN:  0264-0414     ISO Abbreviation:  J Sports Sci     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-03-04     Completed Date:  2004-06-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8405364     Medline TA:  J Sports Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  215-25     Citation Subset:  IM    
Affiliation:
Department of Exercise and Sport Science, The Manchester Metropolitan University, Crewe +Alsager Faculty, Alsager ST7 2HL, UK.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Anthropometry
Exercise / physiology*
Female
Heart Rate / physiology
Humans
Lactic Acid / blood*
Male
Oxygen Consumption / physiology
Physical Endurance / physiology*
Reference Values
Running / physiology*
Sex Factors
Chemical
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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