Effect of water ingestion on endurance capacity during prolonged running
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1996
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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EXERCISE; TREADMILL; MAN; WOMAN; AEROBIC-CAPACITY; WATER; BEVERAGE; ENERGY-METABOLISM
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-366-509
(Last edited on
2002/02/27 18:45:00 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
This study examined the influence of water ingestion on endurance capacity during submaximal treadmill running. Four men and four women with a mean (plus/minus SE) age of 21.4 plus/minus 0.7 years, height of 169 plus/minus 2 cm, body mass of 63.1 plus/minus 2.9 kg and VO2max of 51.1 plus/minus 1.8 ml kg-1min-1, performed two randomly assigned treadmill runs at 70 percent VO2max to exhaustion. No fluid was ingested during one trial (NF-trial), whereas a single water bolus of 3.0 ml kg-1 body mass was ingested immediately pre-exercise and serial feedings of 2.0 ml kg-1 body mass were ingested every 15 min during exercise in a fluid replacement trial (FR-trial). Run time for the NF-trial was 77.7 plus/minus 7.7 min, compared to 103 plus/minus 12.4 min for the FR-trial (P is less than 0.01). Body mass (corrected for water ingestion) decreased by 2.0 plus/minus 0.2 percent in the NF-trial and 2.7 plus/minus 0.2 percent in the FR-trial (P is less than 0.01), while plasma volume decreased by 1.1 plus/minus 1.1 percent and 3.5 plus/minus 1.1 percent in the two trials respectively (N.S.). However, these apparent differences in circulatory volume were not associated with differences in rectal temperature. Respiratory exchange ratios indicated increased carbohydrate metabolism (73 percent vs 64 percent of total energy expenditure) and suppressed fat metabolism after 75 min of exercise in the NF-trial compared with the FR-trial (NF-trial, 0.90 plus/minus 0.01; FR-trial, 0.86 plus/minus 0.03; P is less than 0.01). Blood glucose concentrations were similar in both trials, while blood lactate concentrations were higher in the NF-trial at the end of exercise (4.83 plus/minus 0.34 vs 4.18 plus/minus 0.38 mM; P is less than 0.05). In summary, water ingestion during prolonged running improved endurance capacity.
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