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Related Experiment Videos

Energy intakes on sledging expeditions

I T Campbell

    The British Journal of Nutrition
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Energy intake during Greenland expeditions was higher than Antarctic journeys, with subjects losing weight despite ample food. This suggests diet monotony impacts energy balance during prolonged physical activity.

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    Area of Science:

    • Human physiology
    • Nutritional science
    • Polar exploration

    Background:

    • Previous Antarctic sledging journeys reported mean energy intakes of 14.2 MJ.
    • Earlier studies relied on inferred food box energy content, unlike more accurate weighed-diet surveys.
    • Recent studies indicate lower energy intakes than historical records.

    Purpose of the Study:

    • To measure energy intake in male subjects during a summer manhauling journey in Greenland.
    • To compare energy intake and expenditure in a polar environment.
    • To investigate factors influencing energy balance during prolonged physical exertion.

    Main Methods:

    • An individual weighed-diet survey was conducted over 33 days.
    • Six male subjects participated in a summer manhauling expedition.

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  • Activity levels were kept constant throughout the journey.

    • Main Results:

    • Mean daily energy intake was 16.5 MJ, rising to 20.1 MJ during rest periods.
    • Subjects experienced a mean weight loss of 2.3 kg, attributed to fat loss.
    • Energy intake increased progressively over the 5-week journey despite excess food availability.

    Conclusions:

    • Energy intake in Greenland was higher than recent Antarctic studies but lower than historical reports.
    • Dietary monotony is hypothesized as a reason for weight loss despite excess food.
    • A new energy intake-expenditure balance may have been achieved by the end of the expedition.