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Developmental Changes in Isometric Strength: Longitudinal Study in Adolescent Soccer Players.

Joao P Duarte1,2, João Valente-Dos-Santos2,3, Manuel J Coelho-E-Silva1,2

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This study tracked knee extensor and flexor strength in young athletes over five years. Chronological age and fat-free mass were key predictors of isometric strength development.

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Area of Science:

  • Pediatric sports science
  • Human physiology
  • Biomechanical analysis

Background:

  • Adolescent athletic development requires understanding muscle strength progression.
  • Longitudinal data on knee muscle strength is crucial for identifying potential impairments.

Purpose of the Study:

  • To longitudinally examine changes in isometric knee extensor (ImKE) and knee flexor (ImKF) strength.
  • To identify predictors of isometric strength development in young athletes.
  • To establish predictive models for ImKE and ImKF strength.

Main Methods:

  • Longitudinal study of 67 male athletes (11.0-13.9 years at baseline) over five years.
  • Measurements included stature, body mass, skinfolds, and isometric strength at 30° and 60°.
  • Fat-free mass (FFM) derived from skinfolds; multilevel regression analyses used for modeling.

Main Results:

  • Annual increases in chronological age (CA) significantly predicted isometric strength.
  • Each 1 kg increase in FFM positively correlated with increased isometric strength.
  • Developed polynomial regression models predicting ImKE and ImKF strength based on CA and FFM.

Conclusions:

  • Chronological age and fat-free mass are significant longitudinal predictors of knee muscle strength in adolescents.
  • Skeletal maturity showed a negligible effect on strength development.
  • Regular assessment of knee extensor and flexor strength is recommended during adolescence.