Longitudinal performance development in youth track and field: A population-level study

Area of Science:

• Sports Science
• Human Performance
• Developmental Trajectories

Background:

• Cross-sectional performance benchmarks are commonly used to assess youth athletic development.
• These benchmarks may not accurately reflect individual athlete progression over time.
• Understanding sex-specific developmental patterns is crucial for targeted training.

Purpose of the Study:

• To construct longitudinal developmental trajectories for competitive youth athletes.
• To document sex-specific athletic development patterns.
• To evaluate the accuracy of cross-sectional performance benchmarks against individual development.

Main Methods:

• Retrospective longitudinal cohort study analyzing season-best performances from a large national athletics database (31,028 athletes, ages 10-25).
• Utilized within-athlete mixed-effects models and descriptive panel trajectories for 60m, 800m, high jump, and long jump.
• Compared longitudinal data with cross-sectional top-100 benchmarks and analyzed relative age effects.

Main Results:

• Individual performance improved through the late teens and early twenties, surpassing cross-sectional benchmarks which plateaued earlier.
• Significant sex-specific divergence in performance emerged around puberty (ages 13-14), stabilizing by age 18.
• Cross-sectional benchmarks substantially underestimated actual development, with gaps up to 48 percentage points in high jump.

Conclusions:

• Cross-sectional top-N curves inaccurately represent individual athletic development.
• Longitudinal trajectories provide a more realistic depiction of athlete progression.
• Longitudinal data are superior for coaching insights and talent identification in youth sports.