| Effect of lactate consumption on exercise performance. | |
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MedLine Citation:
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PMID: 9763796 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Maintenance of plasma glucose is important in endurance performance. Gluconeogenesis or carbohydrate ingestion maintain glucose after hepatic glycogen depletion. Lactate may also serve as a gluconeogenic precursor as well as a blood buffer. METHODS: To determine if an 8% carbohydrate (CHO) sports drink with and without a 2% lactate (L) solution increased endurance performance, peak power, and delayed blood acidosis, seven trained cyclists participated in a double-blind randomized study (6 males and 1 female) performed a bicycle test to determine max VO2max HR and the HR associated with the first respiratory exchange ratio (RER) value greater than 1.0 (target HR). Four bicycle rides to exhaustion, separated by one week, were done at a constant workload at a HR 10 beats below each subject's target HR. After a 12-hour fast, subjects received 100 g CHO 2-3 hrs before each test. Mean exercise heart rate was 86-87% max HR. During the final 30 s of each ride the Wingate power test was performed. Subjects consumed either (placebo, 2% L, 8% CHO or 8% CHO plus 2% L) every 20 min. Blood samples were collected before, every 30 min during and immediately following the test. RESULTS: No significant differences were observed in total time (placebo: 95.3 +/- 25.8, 2% lactate: 95.7 +/- 30.0, 8% CHO: 105.2 +/- 37.2, 8% CHO + 2% lactate: 89.0 +/- 28.1 min) or peak power (placebo: 798.2 +/- 241.1, 2% L: 750.1 +/- 279.2, 8% CHO: 789.4 +/- 353.5, 8% CHO + 2% L: 716.3 +/- 331.3 Watts) among drinks. There were no differences in insulin, glucose, pH and HCO3- after the power tests among the drinks. CONCLUSION: Exercise performance is unaffected by oral supplementation with lactate. |
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Authors:
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R W Bryner; W G Hornsby; R Chetlin; I H Ullrich; R A Yeater |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: The Journal of sports medicine and physical fitness Volume: 38 ISSN: 0022-4707 ISO Abbreviation: J Sports Med Phys Fitness Publication Date: 1998 Jun |
Date Detail:
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Created Date: 1998-10-21 Completed Date: 1998-10-21 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0376337 Medline TA: J Sports Med Phys Fitness Country: ITALY |
Other Details:
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Languages: eng Pagination: 116-23 Citation Subset: IM; S |
Affiliation:
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Department of Exercise Physiology, Morgantown, WV 26506-6116, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Blood Glucose
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analysis Dietary Supplements* Double-Blind Method Exercise / physiology* Exercise Test Female Humans Lactic Acid / pharmacology* Male Oxygen Consumption* Physical Endurance / physiology Respiration |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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