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September 10, 2025International Journal of Sports Science & CoachingOpen Access

Longitudinal changes in strength, power, speed, and body mass in American football players: Diminishing returns as training age increases

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Authors

MMMatthew MorrisonJMJ. Bryan MannDRDale B. Read

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Overview

Observational analysis details strength, power, and speed over four years in NCAA football players, indicating diminishing returns in physical improvements.

Key Points

  • Improvements in strength, power, and speed were significant during the first year, yet smaller in subsequent years.
  • The study analyzed 2628 observations from 512 NCAA Division 1 football players over a 15-year period.
  • Linear mixed models with Cohen's effect size were used to evaluate year-on-year changes in physical qualities.
  • Findings suggest physical improvements become less pronounced as training age increases, highlighting a potential plateau.

Cite This Study

Morrison et al. (2025) studied this question.

synapsesocial.com/papers/68c1d7e354b1d3bfb60f9bc6https://doi.org/10.1177/17479541251367154
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