Document Detail


Monitoring the lactate threshold in world-ranked swimmers.
MedLine Citation:
PMID:  11224820     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: To determine whether lactate profiling could detect changes in discrete aspects of endurance fitness in world-ranked swimmers during a season. METHODS: Eight male and four female Australian National Team swimmers aged 20--27 yr undertook a 7 x 200-m incremental swimming step test on four occasions over an 8-month period before the 1998 Commonwealth Games (CG): January (10 d before the World Championships), May (early-season camp), July (midseason), and August (16 d before the CG). The lactate threshold (LT) was determined by a mathematical formula that calculated the threshold as a function of the slope and y-intercept of the lactate-velocity curve. RESULTS: Maximal 200-m test time declined initially from 127.7 +/- 4.2 s (January 1998) to 130.2 +/- 4.5 s (May 1998) and 129.1 +/- 4.3 s (July 1998) before improving to 126.8 +/- 4.2 s (August 1998) (P < 0.005). The swimming velocity at LT (s.100 m(-)1) also declined midseason before improving before the CG (P < 0.02) (January 1998: 70.5 +/- 2.1; May 1998: 72.0 +/- 2.2; July 1998: 72.2 +/- 2.2; and August 1998: 70.8 +/- 2.1). The blood lactate concentration at the LT decreased (P < 0.02) from 3.6 +/- 0.2 mM to 3.2 +/- 0.1 mM and 2.9 +/- 0.2 mM before returning to 3.4 +/- 0.2 mM for January, May, July, and August, respectively. The lactate tolerance rating (LT(5--10)), defined as the differential velocity between lactate concentrations of 5.0 and 10.0 mM, declined midway through the season (P < 0.015): 6.6 +/- 0.5 s.100 m(-1), 7.7 +/- 0.5 s.100 m(-1), 8.5 +/- 0.5 s.100 m(-1), and 6.9 +/- 0.4 s.100 m(-1), for January, May, July, and August, respectively. Despite these improvements in indicators of fitness, there was no significant improvement in competition performance across the season. CONCLUSIONS: Maximal effort 200-m time, lactate tolerance rating, and swimming velocity at LT (s.100 m(-1)) all improved in world-ranked swimmers with training, but these changes were not directly associated with competition performance.
Authors:
D B Pyne; H Lee; K M Swanwick
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  33     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2001 Feb 
Date Detail:
Created Date:  2001-03-06     Completed Date:  2001-05-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  291-7     Citation Subset:  IM; S    
Affiliation:
Department of Physiology, Australian Institute of Sport, Canberra ACT 2616, Australia. david.pyne@ausport.gov.au
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MeSH Terms
Descriptor/Qualifier:
Adult
Biological Markers / analysis
Humans
Lactic Acid / blood*
Male
Physical Endurance*
Seasons
Swimming / physiology*
Task Performance and Analysis
Chemical
Reg. No./Substance:
0/Biological Markers; 50-21-5/Lactic Acid

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