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Effects of acute carbohydrate supplementation during sessions of high-intensity intermittent exercise

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The present study evaluated the acute effects of carbohydrate supplementation on heart rate (HR), rate of perceived exertion (RPE), metabolic and hormonal responses during and after sessions of high-intensity intermittent running exercise. Fifteen endurance runners (26 ± 5 years, 64.5 ± 4.9 kg) performed two sessions of intermittent exercise under carbohydrate (CHO) and placebo (PLA) ingestion. The sessions consisted of 12 × 800 m separated by intervals of 1 min 30 s at a mean velocity corresponding to the previously performed 3-km time trial. Both the CHO and PLA sessions were concluded within ∼28 min. Blood glucose was significantly elevated in both sessions (123.9 ± 13.2 mg dl−1 on CHO and 147.2 ± 16.3 mg dl−1 on PLA) and mean blood lactate was significantly higher in the CHO (11.4 ± 4.9 mmol l−1) than in the PLA condition (8.4 ± 5.1 mmol l−1) (P < 0.05). The metabolic stress induced by the exercise model used was confirmed by the elevated HR (∼182 bpm) and RPE (∼18 on the 15-point Borg scale) for both conditions. No significant differences in plasma insulin, cortisol or free fatty acids were observed during exercise between the two trials. During the recovery period, free fatty acid and insulin concentrations were significantly lower in the CHO trial. Supplementation with CHO resulted in higher lactate associated with lipolytic suppression, but did not attenuate the cortisol, RPE or HR responses.

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Acknowledgments

The authors thank CAPES for the fellowship granted. We are also indebted to the laboratory technician Ivanir Pires for help with the experiments.

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Authors and Affiliations

  1. Faculty of Pharmaceutical Sciences, Department of Food and Experimental Nutrition, University of São Paulo, São Paulo, SP, Brazil

    Maysa Vieira de Sousa, Marcelo Macedo Rogero & Julio Tirapegui

  2. Catholic University of Brasília, Brasilia, DF, Brazil

    Herbert Gustavo Simões

  3. Methodist University of Piracicaba, Lins, SP, Brazil

    Marie Oshiiwa

  4. Av. Prof. Lineu Prestes, 580, São Paulo, SP, 05508-900, Brazil

    Maysa Vieira de Sousa

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  1. Maysa Vieira de Sousa
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  2. Herbert Gustavo Simões
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  3. Marie Oshiiwa
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  4. Marcelo Macedo Rogero
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  5. Julio Tirapegui
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Correspondence to Maysa Vieira de Sousa.

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de Sousa, M.V., Simões, H.G., Oshiiwa, M. et al. Effects of acute carbohydrate supplementation during sessions of high-intensity intermittent exercise. Eur J Appl Physiol 99, 57–63 (2007). https://doi.org/10.1007/s00421-006-0317-3

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