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Related Experiment Videos

Development of cardiorespiratory function in circumpubertal boys: a longitudinal study.

D A Cunningham, D H Paterson, C J Blimkie

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |February 1, 1984
    PubMed
    Summary

    Cardiorespiratory function in boys aged 9-15 years shows that oxygen uptake (VO2) is primarily determined by stroke volume (SV) during growth. Late maturers exhibit larger VO2 and SV throughout development.

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    Area of Science:

    • Pediatric Exercise Physiology
    • Cardiorespiratory Function
    • Human Growth and Development

    Background:

    • Understanding cardiorespiratory adaptations during circumpubertal growth is crucial for assessing exercise capacity.
    • Individual variations in maturation rates significantly influence physiological development in boys.

    Purpose of the Study:

    • To investigate changes in cardiorespiratory function (VO2, cardiac output, arteriovenous O2 difference) during circumpubertal growth in boys.
    • To examine the relationship between oxygen uptake (VO2) and stroke volume (SV) relative to maturative age and peak height velocity (PHV).

    Main Methods:

    • Longitudinal study of 62 boys (9-10 yr) over 6 years, with annual measurements.
    • Submaximal bicycle ergometry to assess VO2, cardiac output, and arteriovenous O2 difference.

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  • Data normalized to heart rate (155 bpm) and maturative age relative to PHV, with stratification into early, mid, and late maturers.

    • Main Results:

    • Late maturers consistently displayed larger VO2 and SV across all maturative ages.
    • Stroke volume (SV) correlated with VO2 throughout development, except during peak growth velocity.
    • Arteriovenous O2 difference increased during peak growth year, with minimal changes otherwise.

    Conclusions:

    • Oxygen uptake (VO2) during circumpubertal growth in boys is primarily dictated by stroke volume (SV).
    • Maturation timing influences cardiorespiratory development, with late maturers showing distinct patterns.
    • The relationship between SV and VO2 is robust but temporarily altered during rapid growth phases.