Prognostic relevance of motor talent predictors in early adolescence: A group and individual based evaluation considering different levels of achievement in youth football
ABSTRACT In the debate about the usefulness of motor diagnostics in the talent identification process, the prognostic validity for tests conducted in early adolescence is of critical interest. Using a group and individual based statistical approach, this prospective cohort study evaluated a nationwide assessment of speed abilities and technical skills regarding its relevance for future achievement levels. The sample consisted of 22,843 U12 players belonging to the top 4% in German football. The U12 results in five tests served as predictors for players' selection levels in U16 U19 (youth national team, regional association, youth academy, not selected) Group mean differences proved the prognostic relevance for all predictors. Low individual selection probabilities demonstrated limited predictive values, while excellent test results proved their particular prognostic relevance. Players scoring percentile ranks (PRs) 99 had a 12 times higher chance to become youth national team players than players scoring PR 99. Simulating increasing score cut off values not only enhanced specificity (correctly identified non talents) but also led to lower sensitivity (loss of talents) Extending the current research, these different approaches revealed the ambiguity of the diagnostics' prognostic relevance, representing both the usefulness and several pitfalls of nationwide diagnostics. Therefore, the present diagnostics can support but not substitute for coaches' subjective decisions for talent identification, and multidisciplinary designs are required.
Journal of sports sciences