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Predictive leg strength values in immediately prepubescent and postpubescent athletes.

G C Tabin, J R Gregg, T Bonci

    The American Journal of Sports Medicine
    |November 1, 1985
    PubMed
    Summary

    Lean body weight is a key indicator of lower extremity muscle strength in athletic children. This study provides crucial data for training, rehabilitation, and return-to-sport decisions in young athletes.

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    Area of Science:

    • Pediatric Sports Medicine
    • Biomechanics
    • Human Physiology

    Background:

    • Assessing lower extremity muscle strength in children is vital for sports performance and injury prevention.
    • Establishing normative strength values aids in objective evaluation of athletic development.
    • Previous research has not comprehensively detailed relative muscle strength across prepubescent and postpubescent athletic children.

    Purpose of the Study:

    • To determine the relative strengths of major lower extremity muscle groups in healthy, athletic children.
    • To identify anthropometric parameters that correlate with maximal torque force development.
    • To establish baseline strength data for training, rehabilitation, and return-to-sport protocols.

    Main Methods:

    • Sixty healthy, athletic children (prepubescent and postpubescent, boys and girls) were tested using a Cybex II Dynamometer.

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  • Maximal torque force of lower extremity muscle groups was measured at 60 deg/sec.
  • Lean body weight and other anthropometric parameters were recorded and correlated with strength measurements.

    • Main Results:

    • Lean body weight demonstrated the strongest correlation with maximal torque force development.
    • Mean maximal quadriceps torque force was 70% of lean body weight in prepubescent children.
    • In postpubescent children, mean peak quadriceps torque was 80% of lean body weight in girls and 90% in boys.
    • Significant correlations were found between quadriceps strength and the strength of hamstrings, ankle dorsiflexors, and plantar flexors.

    Conclusions:

    • Lean body weight is a reliable predictor of lower extremity muscle strength in athletic children.
    • The study provides normative strength data for different age and sex groups, valuable for pediatric sports science.
    • These findings support the development of targeted training programs and evidence-based return-to-sport criteria for young athletes.