Water versus carbohydrate-electrolyte fluid replacement during loaded marching under heat stress

Christopher Byrne, Chin Leong Lim, S. A N Chew, E. T Y Ming

    Research output: Contribution to journalArticle

    Abstract

    This study compared the effectiveness of carbohydrate-electrolyte (CHO-E) fluid replacement versus water (WAT) on hydration status, physiological and subjective responses, and exercise performance during a 3 × 60-minute loaded (14 kg) treadmill walk in 35°C ambient temperature and 55% humidity. CHO-E did not affect urine loss, plasma volume change (WAT = -3.0 ± 1.6% vs. CHO-E = -1.1 ± 1.6%), dehydration (WAT = 0.4 ± 0.3% vs. CHO-E = 0.4 ± 0.3% of body mass), or core body temperature (Tc) and heart rate (HR) responses. Endurance time was greater but not significantly different with CHO-E (WAT = 134 ± 9 vs. CHO-E = 146 ± 9 minutes). CHO-E increased the frequency of task completion (WAT = 21% vs. CHO-E = 50%), elevated blood glucose, and reduced perceived exertion. CHO-E offers potential to enhance exercise capacity by elevating blood glucose and thereby preventing hypoglycemia, maintaining high rates of carbohydrate oxidation, and/or preventing central fatigue; but provided no additional benefits with regard to hydration status and physiological function during loaded walking under heat stress. Copyright © by Association of Military Surgeons of U.S., 2005.

    Original languageEnglish
    Pages (from-to)715-721
    Number of pages7
    JournalMilitary Medicine
    Volume170
    Issue number8
    Publication statusPublished - Aug 2005

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    electrolytes
    heat stress
    carbohydrates
    water
    blood glucose
    exercise
    dehydration (animal physiology)
    hypoglycemia
    exercise equipment
    surgeons
    physiological state
    walking
    body temperature
    heart rate
    humidity
    ambient temperature
    urine
    fluids
    oxidation

    Cite this

    Byrne, C., Lim, C. L., Chew, S. A. N., & Ming, E. T. Y. (2005). Water versus carbohydrate-electrolyte fluid replacement during loaded marching under heat stress. Military Medicine, 170(8), 715-721.
    Byrne, Christopher ; Lim, Chin Leong ; Chew, S. A N ; Ming, E. T Y. / Water versus carbohydrate-electrolyte fluid replacement during loaded marching under heat stress. In: Military Medicine. 2005 ; Vol. 170, No. 8. pp. 715-721.
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    abstract = "This study compared the effectiveness of carbohydrate-electrolyte (CHO-E) fluid replacement versus water (WAT) on hydration status, physiological and subjective responses, and exercise performance during a 3 × 60-minute loaded (14 kg) treadmill walk in 35°C ambient temperature and 55{\%} humidity. CHO-E did not affect urine loss, plasma volume change (WAT = -3.0 ± 1.6{\%} vs. CHO-E = -1.1 ± 1.6{\%}), dehydration (WAT = 0.4 ± 0.3{\%} vs. CHO-E = 0.4 ± 0.3{\%} of body mass), or core body temperature (Tc) and heart rate (HR) responses. Endurance time was greater but not significantly different with CHO-E (WAT = 134 ± 9 vs. CHO-E = 146 ± 9 minutes). CHO-E increased the frequency of task completion (WAT = 21{\%} vs. CHO-E = 50{\%}), elevated blood glucose, and reduced perceived exertion. CHO-E offers potential to enhance exercise capacity by elevating blood glucose and thereby preventing hypoglycemia, maintaining high rates of carbohydrate oxidation, and/or preventing central fatigue; but provided no additional benefits with regard to hydration status and physiological function during loaded walking under heat stress. Copyright {\circledC} by Association of Military Surgeons of U.S., 2005.",
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    Byrne, C, Lim, CL, Chew, SAN & Ming, ETY 2005, 'Water versus carbohydrate-electrolyte fluid replacement during loaded marching under heat stress', Military Medicine, vol. 170, no. 8, pp. 715-721.

    Water versus carbohydrate-electrolyte fluid replacement during loaded marching under heat stress. / Byrne, Christopher; Lim, Chin Leong; Chew, S. A N; Ming, E. T Y.

    In: Military Medicine, Vol. 170, No. 8, 08.2005, p. 715-721.

    Research output: Contribution to journalArticle

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