Document Detail


Comparison of critical swimming velocity and velocity at lactate threshold in elite triathletes.
MedLine Citation:
PMID:  10950447     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to determine whether the critical swimming velocity (Vcrit) corresponds to the velocity at lactate threshold (V-LT) in elite triathletes. Eight elite triathletes (5 male, 3 female; age 26 +/- 4 years; height 1.7 +/- 0.1 m and body mass 75 +/- 4 kg) participated in the study. Vcrit, defined as the speed that could theoretically be maintained indefinitely without exhaustion, was expressed as the slope of a regression line between swimming distance covered and the corresponding times of five time trials over 100, 200, 400, 800 and 1500m and all combinations of these. Lactate threshold (LT) was determined by visual inspection as the point of first inflection of the lactate-work rate curve following 5 x 300 m swims of increasing velocity which were paced using the Aquapacer (Challenge and Response, Inverurie, Scotland). Velocities of the 300 m swims were -10, -5, 0, +5 and +10% of the average 100m pace from a 1500 m time trial. Vcrit was similar regardless of the combination or number of time trials used in the linear regression. For all subjects Vcrit was significantly faster (p <0.05) than V-LT (1.23 +/- 0.11 m x s(-1) and 1.15 +/- 0.10 m x s(-1) respectively). Blood lactate concentrations were also significantly higher (p < 0.05) at Vcrit (3.0 +/- 1.0 mM) than at LT (1.9 +/- 0.4 mM). Results from the present study demonstrate that Vcrit can be calculated from any two time trials in triathletes, however Vcrit did not represent V-LT in triathletes. Since Vcrit is faster than V-LT it is unlikely to be sustained indefinitely and consequently the notion of Vcrit should be re-evaluated in light of these findings.
Authors:
L Martin; G P Whyte
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  International journal of sports medicine     Volume:  21     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  2000 Jul 
Date Detail:
Created Date:  2000-11-27     Completed Date:  2000-12-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  366-8     Citation Subset:  IM    
Affiliation:
Division of Sport and Performance, University of Wolverhampton, Walsall, UK. in6078@wlv.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Adult
Female
Humans
Lactic Acid / blood*,  metabolism
Linear Models
Male
Physical Endurance
Swimming / physiology*
Time Factors
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid
Comments/Corrections
Comment In:
Int J Sports Med. 2001 Jan;22(1):81-3   [PMID:  11258647 ]

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


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