The ingestion of combined carbohydrates does not alter metabolic responses or performance capacity during soccer-specific exercise in the heat compared to ingestion of a single carbohydrate

N. D. Clarke, I. T. Campbell, B. Drust, L. Evans, T. Reilly, D. P.M. Maclaren

    Research output: Contribution to journalArticle

    6 Citations (Scopus)
    21 Downloads (Pure)

    Abstract

    This study was designed to investigate the effect of ingesting a glucose plus fructose solution on the metabolic responses to soccer-specific exercise in the heat and the impact on subsequent exercise capacity. Eleven male soccer players performed a 90 min soccer-specific protocol on three occasions. Either 3 ml · kg -1 body mass of a solution containing glucose (1 g · min -1 glucose) (GLU), or glucose (0.66 g · min -1) plus fructose (0.33 g · min -1) (MIX) or placebo (PLA) was consumed every 15 minutes. Respiratory measures were undertaken at 15-min intervals, blood samples were drawn at rest, half-time and on completion of the protocol, and muscle glycogen concentration was assessed pre- and post-exercise. Following the soccer-specific protocol the Cunningham and Faulkner test was performed. No significant differences in post-exercise muscle glycogen concentration (PLA, 62.99 ± 8.39 mmol · kg wet weight -1; GLU 68.62 ± 2.70; mmol · kg wet weight -1 and MIX 76.63 ± 6.92 mmol · kg wet weight -1) or exercise capacity (PLA, 73.62 ± 8.61 s; GLU, 77.11 ± 7.17 s; MIX, 83.04 ± 9.65 s) were observed between treatments (P > 0.05). However, total carbohydrate oxidation was significantly increased during MIX compared with PLA (P < 0.05). These results suggest that when ingested in moderate amounts, the type of carbohydrate does not influence metabolism during soccer-specific intermittent exercise or affect performance capacity after exercise in the heat.

    Original languageEnglish
    Pages (from-to)699-708
    Number of pages10
    JournalJournal of Sports Sciences
    Volume30
    Issue number7
    Early online date6 Mar 2012
    DOIs
    Publication statusPublished - 1 Apr 2012

    Fingerprint

    Soccer
    Eating
    Hot Temperature
    Carbohydrates
    Glucose
    Placebos
    Fructose
    Glycogen
    Weights and Measures
    Muscles

    Bibliographical note

    This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of sports sciences on 06/03/12, available online: http://www.tandfonline.com/10.1080/02640414.2012.665941

    Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

    Keywords

    • Fructose
    • Glucose
    • Muscle glycogen
    • Soccer

    ASJC Scopus subject areas

    • Orthopedics and Sports Medicine
    • Physical Therapy, Sports Therapy and Rehabilitation

    Cite this

    The ingestion of combined carbohydrates does not alter metabolic responses or performance capacity during soccer-specific exercise in the heat compared to ingestion of a single carbohydrate. / Clarke, N. D.; Campbell, I. T.; Drust, B.; Evans, L.; Reilly, T.; Maclaren, D. P.M.

    In: Journal of Sports Sciences, Vol. 30, No. 7, 01.04.2012, p. 699-708.

    Research output: Contribution to journalArticle

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    abstract = "This study was designed to investigate the effect of ingesting a glucose plus fructose solution on the metabolic responses to soccer-specific exercise in the heat and the impact on subsequent exercise capacity. Eleven male soccer players performed a 90 min soccer-specific protocol on three occasions. Either 3 ml · kg -1 body mass of a solution containing glucose (1 g · min -1 glucose) (GLU), or glucose (0.66 g · min -1) plus fructose (0.33 g · min -1) (MIX) or placebo (PLA) was consumed every 15 minutes. Respiratory measures were undertaken at 15-min intervals, blood samples were drawn at rest, half-time and on completion of the protocol, and muscle glycogen concentration was assessed pre- and post-exercise. Following the soccer-specific protocol the Cunningham and Faulkner test was performed. No significant differences in post-exercise muscle glycogen concentration (PLA, 62.99 ± 8.39 mmol · kg wet weight -1; GLU 68.62 ± 2.70; mmol · kg wet weight -1 and MIX 76.63 ± 6.92 mmol · kg wet weight -1) or exercise capacity (PLA, 73.62 ± 8.61 s; GLU, 77.11 ± 7.17 s; MIX, 83.04 ± 9.65 s) were observed between treatments (P > 0.05). However, total carbohydrate oxidation was significantly increased during MIX compared with PLA (P < 0.05). These results suggest that when ingested in moderate amounts, the type of carbohydrate does not influence metabolism during soccer-specific intermittent exercise or affect performance capacity after exercise in the heat.",
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    N2 - This study was designed to investigate the effect of ingesting a glucose plus fructose solution on the metabolic responses to soccer-specific exercise in the heat and the impact on subsequent exercise capacity. Eleven male soccer players performed a 90 min soccer-specific protocol on three occasions. Either 3 ml · kg -1 body mass of a solution containing glucose (1 g · min -1 glucose) (GLU), or glucose (0.66 g · min -1) plus fructose (0.33 g · min -1) (MIX) or placebo (PLA) was consumed every 15 minutes. Respiratory measures were undertaken at 15-min intervals, blood samples were drawn at rest, half-time and on completion of the protocol, and muscle glycogen concentration was assessed pre- and post-exercise. Following the soccer-specific protocol the Cunningham and Faulkner test was performed. No significant differences in post-exercise muscle glycogen concentration (PLA, 62.99 ± 8.39 mmol · kg wet weight -1; GLU 68.62 ± 2.70; mmol · kg wet weight -1 and MIX 76.63 ± 6.92 mmol · kg wet weight -1) or exercise capacity (PLA, 73.62 ± 8.61 s; GLU, 77.11 ± 7.17 s; MIX, 83.04 ± 9.65 s) were observed between treatments (P > 0.05). However, total carbohydrate oxidation was significantly increased during MIX compared with PLA (P < 0.05). These results suggest that when ingested in moderate amounts, the type of carbohydrate does not influence metabolism during soccer-specific intermittent exercise or affect performance capacity after exercise in the heat.

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