Abstract
This study assessed the contribution of relative age, anthropometry, maturation, and
physical fitness characteristics on soccer playing position (goalkeeper [GK], central-defender
[CD], lateral-defender [LD], central-midfield [CM], lateral-midfielder [LM], and forward
[FWD]) for 465 elite-youth players (U13–U18’s). U13–14 CD were relatively older than
LD and CM (likely small effects). CD and GK were generally taller and heavier (likely small to very-likely moderate effects) than other players at each developmental stage and were advanced
maturers at U13–14 (very-likely small to likely moderate effects). GK had inferior agility (very-likely small to likely moderate effects), endurance (very-likely small to likely moderate effects), and sprint capacities (likely small-moderate effects) vs. outfield positions at U13–14, but deficits in anaerobic
phenotypes were diminished in U15–16 and U17–18. Position specific fitness characteristics
were distinguished at U15–16 (likely small) and U17–18 (likely moderate), where LM were faster than their central counterparts. In summary, relative
age, maturation and anthropometric characteristics appear to bias the allocation of
players into key defensive roles from an early development stage, whereas position-specific
physical attributes do not become apparent until the latter stages of talent development
in outfield players. Given the inter-individual trajectories of physical development
according to biological maturation, playing position allocation might be considered
‘plastic’ by selectors, until complete-maturity is achieved.
Key word
talent identification - anthropometry - fitness - relative age effect - maturity
