Effect of glucose polymer ingestion on energy and fluid balance during exercise
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1989
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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TRIATHLON; MAN; EXERCISE; GLUCOSE; PLASMA-VOLUME; LACTATE; ENERGY-METABOLISM; CARBOHYDRATE; GLUCOSE-POLYMER
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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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103-366-276
(Last edited on
2002/02/27 18:45:02 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
Nine male triathletes were studied during 160 min of exercise at 65 percent VO2max on two occasions to examine the effect of glucose polymer ingestion on energy and fluid balance. During one trial they received 200 ml of a 10 percent glucose polymer solution at 20 min intervals during exercise (CHO), while in the other they received an equal volume of a sweet placebo (CON). On average, blood glucose levels (CON=4.2 plus/minus 0.2 mmol l-1, CHO=4.8 plus/minus 0.1, mean plus/minus S.E.) and respiratory exchange ratios (CON=0.84 plus/minus 0.01, CHO=0.87 plus/minus 0.01) during exercise were higher as a result of the glucose polymer ingestion. There were no differences between trials, however, in the estimated plasma volume changes during exercise. Exercise time to exhaustion at an intensity corresponding to 110 percent VO2max, performed 5 min after the submaximal exercise, was not influenced by glucose polymer ingestion. Relative to a control exercise bout conducted without prior exercise, however, sprint performance and postexercise blood lactate accumulation were impaired in both trials. It is concluded that glucose polymer ingestion maintains blood glucose levels and a high rate of carbohydrate oxidation during prolonged exercise, without compromising fluid balance.
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