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Associations Between Training Load and Acceleration-Speed Profile in Youth Soccer Athletes
Pedro Cardoso1, Francisco Tavares1, Nuno Loureiro1
1Medical and Performance Department, Sporting Clube Portugal, Lisboa, Portugal.
International Journal of Sports Medicine
|August 14, 2025
Summary
Elite youth soccer players
Area of Science:
- Sports Science
- Biomechanics
- Soccer Performance Analysis
Background:
- Soccer performance relies heavily on acceleration and speed.
- The acceleration-speed (A-S) profile quantifies maximal theoretical acceleration (A0) and speed (S0).
- Understanding external load's impact on A-S profile is crucial for training optimization.
Purpose of the Study:
- To investigate the relationship between external load metrics and the A-S profile (A0 and S0) in elite academy soccer athletes.
- To analyze these associations across various age categories.
Main Methods:
- One hundred thirty-six elite academy soccer athletes (U14 to B-team) were monitored over a season.
- Global Navigation Satellite System (GNSS) technology was used to collect A-S profile and external load data.
- Stepwise regression analysis was employed to determine correlations.
Main Results:
- A significant positive correlation was observed between accumulated sprint distance (Spr. Dist.) and maximal theoretical speed (S0) in multiple age groups (U15, U17, U19, U23, B-team).
- No significant correlation was found between any external load metric and maximal theoretical acceleration (A0).
Conclusions:
- Accumulated sprint distance is a key factor in enhancing sprint speed (S0) in young soccer players.
- Acceleration (A0) may be influenced by factors beyond external training load, potentially including strength training.
- Individualized training programs incorporating sprint distance are recommended for improving soccer players' sprint capacity.
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