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Cardiorespiratory function during exercise in obese children.

T Reybrouck, M Weymans, J Vinckx

    Acta Paediatrica Scandinavica
    |March 1, 1987
    PubMed
    Summary
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    Obese children have lower cardiorespiratory fitness, with a significantly reduced ventilatory threshold compared to healthy peers. This may lead them to avoid exercise, contributing to maintained overweight.

    Area of Science:

    • Pediatric Obesity Research
    • Cardiorespiratory Fitness Assessment

    Background:

    • Childhood obesity is a growing public health concern.
    • Understanding the physiological limitations in obese children is crucial for intervention strategies.

    Purpose of the Study:

    • To compare cardiorespiratory performance capacity between obese children and healthy controls.
    • To investigate the relationship between ventilatory threshold and habitual physical activity levels in obese children.

    Main Methods:

    • Fifteen obese children (aged 4-16 years) underwent graded exercise testing on a treadmill.
    • Cardiorespiratory performance was assessed by determining the ventilatory threshold (VT).
    • Habitual physical activity was evaluated using a questionnaire.

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    Main Results:

    • Obese children exhibited a significantly lower ventilatory threshold (VT) compared to age-matched healthy peers (70.6% of normal mean).
    • Obese children reported 27% lower habitual physical activity levels.
    • The VT was reached earlier during exercise in obese children, suggesting a lower tolerance for exertion.

    Conclusions:

    • Obese children possess reduced cardiorespiratory fitness, indicated by a lower ventilatory threshold.
    • The increased perceived effort during exercise may lead obese children to avoid physical activity.
    • This avoidance of exercise could be a contributing factor to the maintenance of overweight in this population.