| Increased blood pH but not performance with sodium bicarbonate supplementation in elite rugby union players. | |
| | |
MedLine Citation:
|
PMID: 20739719 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
PURPOSE: This study investigated the effect of ingesting 0.3 g/kg body weight (BW) of sodium bicarbonate (NaHCO₃) on physiological responses, gastrointestinal (GI) tolerability, and sprint performance in elite rugby union players. METHODS: Twenty-five male rugby players, age 21.6 (2.6) yr, participated in a randomized, double-blind, placebo-controlled crossover trial. Sixty-five minutes after consuming 0.3 g/kg BW of either NaHCO₃ or placebo, participants completed a 25-min warm-up followed by 9 min of high-intensity rugby-specific training followed by a rugby-specific repeated-sprint test (RSRST). Whole-blood samples were collected to determine lactate and bicarbonate concentrations and pH at baseline, after supplement ingestion, and immediately after the RSRST. Acute GI discomfort was assessed by questionnaire throughout the trials, and chronic GI discomfort was assessed during the 24 hr postingestion. RESULTS: After supplement ingestion and immediately after the RSRST, blood HCO₃⁻ concentration and pH were higher for the NaHCO₃ condition than for the placebo condition (p < .001). After the RSRST, blood lactate concentrations were significantly higher for the NaHCO₃ than for the placebo condition (p < .001). There was no difference in performance on the RSRST between the 2 conditions. The incidence of belching, stomachache, diarrhea, stomach bloating, and nausea was higher after ingestion of NaHCO₃ than with placebo (all p < .050). The severity of stomach cramps, belching, stomachache, bowel urgency, diarrhea, vomiting, stomach bloating, and flatulence was rated worse after ingestion of NaHCO₃ than with placebo (p < .050). CONCLUSIONS: NaHCO₃ supplementation increased blood HCO₃⁻ concentration and attenuated the decline in blood pH compared with placebo during high-intensity exercise in well-trained rugby players but did not significantly improve exercise performance. The higher incidence and greater severity of GI symptoms after ingestion of NaHCO₃ may negatively affect physical performance, and the authors strongly recommend testing this supplement during training before use in competitive situations. |
| | |
Authors:
|
Sonya L Cameron; Rebecca T McLay-Cooke; Rachel C Brown; Andrew R Gray; Kirsty A Fairbairn |
Related Documents
:
|
14748459 - The effect of pre-exercise carbohydrate feedings on the intensity that elicits maximal ... 12900689 - Effect of repeated caffeine ingestion on repeated exhaustive exercise endurance. 8074059 - Acute thermogenic effects of nicotine combined with caffeine during light physical acti... 11710409 - The effects of sodium citrate ingestion on 3,000-meter time-trial performance. 11402249 - Minimal influence of carbohydrate ingestion on the immune response following acute resi... 15692319 - The effect of intermittent high-intensity running on gastric emptying of fluids in man. 12376319 - Effect of training on the gh/igf-i axis during exercise in middle-aged men: relationshi... 8499939 - The effects of intermittent liquid meal feeding on selected hormones and substrates dur... 2221489 - Effect of exercise on complement activity. |
Publication Detail:
|
Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
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 Aug |
Date Detail:
|
Created Date: 2010-08-26 Completed Date: 2010-11-02 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 100939812 Medline TA: Int J Sport Nutr Exerc Metab Country: United States |
Other Details:
|
Languages: eng Pagination: 307-21 Citation Subset: IM |
Affiliation:
|
Dept. of Human Nutrition, University of Otago, Dunedin, New Zealand. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Acid-Base Equilibrium
/
drug effects*,
physiology Athletic Performance / physiology* Bicarbonates / blood* Cross-Over Studies Dietary Supplements Double-Blind Method Football / physiology* Gastrointestinal Diseases / chemically induced Humans Hydrogen-Ion Concentration / drug effects Lactic Acid / blood Male Oxygen Consumption / physiology Running / physiology Sodium Bicarbonate / administration & dosage*, adverse effects Young Adult |
| Chemical | |
Reg. No./Substance:
|
0/Bicarbonates; 144-55-8/Sodium Bicarbonate; 50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Race-day carbohydrate intakes of elite triathletes contesting olympic-distance triathlon events.
Next Document: The effect of acute taurine ingestion on endurance performance and metabolism in well-trained cyclis...