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The Impact of Increasing Carbohydrate Intake Doses on Exogenous Carbohydrate Oxidation, Substrate Utilization, and Exercise Performance.

The Impact of Increasing Carbohydrate Intake Doses on Exogenous Carbohydrate Oxidation, Substrate Utilization, and Exercise Performance.

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Aging & Elder Care

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ISBN10: 1243532017
ISBN13: 9781243532015
Publisher: Proquest Umi Dissertation Pub
Pages: 146
Weight: 0.67
Height: 0.38 Width: 7.99 Depth: 10.00
Language: English
This study assessed: (1) the impact of increasing carbohydrate dosages on carbohydrate oxidation and (2) the impact of increasing carbohydrate dosages on exercise performance. Twelve male cyclists/triathletes ingested a placebo or glucose drinks delivering 15, 30, and 60 g-hr-1 during 120 minutes of constant load cycling at ∼75% VO2 PEAK. Glucose drinks were extrinsically labeled with 1.8 mg-g-1 U- 13C-glucose and a 20-km time-trial followed each constant load ride. Blood glucose and insulin were highest when ingesting 60 g-hr -1 while free fatty acids were the lowest. Insulin and free fatty acid responses for placebo and the 15 g-hr-1 trial were virtually identical. Exogenous glucose oxidation rates during the last 30 minutes of the constant load cycling (mean SE) were 0.26 +/- 0.05, 0.44 +/- 0.04 and 0.66 +/- 0.07 g-min-1 for 15, 30 and 60 g-hr-1 ingestion rates, each being significantly different from each other (p

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