Document Detail

Effects of induced alkalosis on simulated match performance in elite female water polo players.
MedLine Citation:
PMID:  20601737     Owner:  NLM     Status:  MEDLINE    
This study investigated the effects of sodium bicarbonate (NaHCO3) ingestion on simulated water polo match performance. Twelve elite players from the Australian National Women's Water Polo Squad (age 23.7 +/- 3.0 yr, height 1.73 +/- 0.05 m, body mass 75.7 +/- 8.0 kg) participated in the study. In a randomized cross-over double-blind design, players ingested 0.3 g/kg of NaHCO3 or placebo 90 min before performing a 59-min match-simulation test (MST) that included 56 x 10-m maximal-sprint swims as the performance measure. Capillary blood samples were obtained preingestion, pre- and post-warm-up, and after each quarter of the MST. Preexercise ingestion of NaHCO3 was effective in enhancing extracellular pH from baseline levels of 7.41; +/- 0.01 (M; +/- 90% confidence limits) to 7.49; +/- 0.01 and bicarbonate levels from 24.4; +/- 0.3 to 28.5; +/- 0.5 mmol/L. The percentage difference in mean sprint times between trials showed no substantial effects of NaHCO3 (0.4; +/- 1.0, effect size = 0.09; +/- 0.23; p = .51). These findings are contrary to those of previous NaHCO3 studies on simulated team-sport performance, but this investigation is unique in that it examined highly trained athletes performing sport-specific tasks. In conclusion, water polo players should not expect substantial enhancement in intermittent-sprint performance from NaHCO3 supplementation.
Frankie Tan; Ted Polglaze; Gregory Cox; Brian Dawson; Iñigo Mujika; Sally Clark
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  20     ISSN:  1526-484X     ISO Abbreviation:  Int J Sport Nutr Exerc Metab     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-07-05     Completed Date:  2010-09-23     Revised Date:  2010-11-01    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  198-205     Citation Subset:  IM    
Sports Science Dept., Singapore Sports Council, Singapore.
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MeSH Terms
Alkalosis / chemically induced,  physiopathology*
Athletic Performance
Cross-Over Studies
Double-Blind Method
Hydrogen-Ion Concentration
Oxygen Consumption / physiology
Sodium Bicarbonate / pharmacology*
Swimming / physiology*
Task Performance and Analysis
Young Adult
Reg. No./Substance:
144-55-8/Sodium Bicarbonate

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

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