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Related Experiment Videos

Physical capacity in twins.

L M Engström, S Fischbein

    Acta Geneticae Medicae Et Gemellologiae
    |January 1, 1977
    PubMed
    Summary

    Identical twins (MZ) showed greater similarity in physical capacity than fraternal twins (DZ). Physical work capacity, unlike vital capacity and muscular strength, appears more influenced by environmental factors.

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    Area of Science:

    • Human physiology
    • Twin studies
    • Behavioral genetics

    Background:

    • Understanding the interplay of genetics and environment in physical capacity is crucial.
    • Twin studies provide a unique model to differentiate genetic and environmental influences.

    Purpose of the Study:

    • To compare physical capacity measures in monozygotic (MZ) and dizygotic (DZ) twins and controls.
    • To investigate the heritability of vital capacity, muscular strength, and physical work capacity.

    Main Methods:

    • Comparison of physical capacity (vital capacity, muscular strength, physical work capacity) in twin boys and controls.
    • Intrapair correlation analysis for MZ and DZ twins.
    • Controlled analysis of leisure-time physical exercise.

    Main Results:

    • No significant differences in physical capacity were found between twin boys and controls.
    • MZ twins exhibited higher intrapair correlations than DZ twins across all capacity measures.
    • Physical work capacity showed lower correlations in both MZ and DZ twins compared to vital capacity and muscular strength.
    • Controlling for physical activity reduced DZ twin similarity in physical work capacity and muscular strength.

    Conclusions:

    • Vital capacity and muscular strength appear to be more genetically influenced.
    • Physical work capacity demonstrates a stronger environmental influence compared to vital capacity and muscular strength.
    • Leisure-time physical activity significantly impacts physical work capacity.

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