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Title: Associations between match participation, maturation, physical fitness, and hormonal levels in elite male soccer player U15: a prospective study with observational cohort
Authors: Eskandarifard, Ebrahim
Nobari, Hadi
Clemente, Filipe Manuel 
Silva, Rui
Silva, Ana Filipa
Figueiredo, António José 
Keywords: Football; Playing time; Skeletal age; Talent development; Young; Performance
Issue Date: 11-Apr-2022
Publisher: BMJ
Serial title, monograph or event: BMC Pediatrics
Volume: 22
Issue: 1
Abstract: Objectives: The aims of this study were to analyze the relationships between minutes of play (MP) and maturity status, fitness, and hormonal levels and to explain how those measures influence the time of play. Methods: Twenty-six youth soccer players U15 participated in this study over a full-season period. Anthropometric measures, maturity status, growth hormone (GH), insulin-like growth factor and physical levels such as maximal oxygen uptake (VO2max), fatigue index, and countermovement jump (CMJ) performance were collected. At the end-season, players were assessed in 6 different tests over four days. Results: VO2max largely correlated with GH (r = 0.57) and CMJ (r = 0.51). Also, GH largely correlated with CMJ (r = 0.55). MP had moderate correlations with VO2max (r = 0.44) and CMJ (r = 0.42). Multiple linear regression with maturation, physical fitness and hormonal levels explained R2 of 0.62 of the MP (F (8, 17) = 3.47, p = 0.015). Although each independent variable alone was not able to determine the playing time, when using the interactions, the model significantly explained the MP. Conclusions: The combination of maturity status, physical fitness, and hormonal levels seem to play a determinant role in explaining the match participation in youth soccer players. © 2022, The Author(s).
ISSN: 1471-2431
DOI: 10.1186/s12887-022-03257-7
Rights: openAccess
Appears in Collections:FCDEF - Artigos em Revistas Internacionais

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