title: Relationship between field tests and match running performance in high-level young Brazilian soccer players.
abstract: BACKGROUND
  The main aim of this study was to analyze the relationship between field tests and match running performance using computational tracking technology in high-level young Brazilian soccer players.
  
  
  METHODS
  Twenty-five young male Brazilian soccer players participated in this study (U-15, N.=13; U-17, N.=12). In the same week, the players were submitted to field tests and actual matches. The field tests were: Maximum Speed (10-30 m), Zig-Zag, Running-based Anaerobic Sprint Test, and Yo-Yo Intermittent Recovery Test Level 1. Additionally, participants performed actual soccer match-play. Match running performance was collected using a fixed video-camera. Subsequently, computerized tracking video-analysis (30 Hz) was utilized to identify each physical performance indicator. Pearson's correlation and linear regression were used for statistical analysis.
  
  
  RESULTS
  The results showed that the majority of field tests were not related to match running performance. The Zig-Zag Test, Running-based Anaerobic Sprint Test, and Yo-Yo Intermittent Recovery Test level 1 seem to be the most specific tests (r=0.41-0.47), however the explanatory powers of these field tests in relation to match running performance were low (R2=17-22%).
  
  
  CONCLUSIONS
  Assessment of match running performance should be included in the evaluation periods of young soccer players, together with the most specific tests reported.
authors.affiliation: Center for Investigation, Education, Innovation, and Intervention in Sports (CIFI2D), Faculty of Sports, University of Porto, Porto, Portugal - aquino.rlq@gmail.com.|Rehabilitation and Functional Performance, Faculty of Medicine at Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil - aquino.rlq@gmail.com.|Biomechanics and Motor Control Lab (LaBioCoM), University of São Paulo, Ribeirão Preto, Brazil - aquino.rlq@gmail.com.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Aquino
authors.affiliation: Rehabilitation and Functional Performance, Faculty of Medicine at Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.|Biomechanics and Motor Control Lab (LaBioCoM), University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Luiz H
authors.initials: LH
authors.lastname: Palucci Vieira
authors.affiliation: Rehabilitation and Functional Performance, Faculty of Medicine at Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Lucas
authors.initials: L
authors.lastname: de Paula Oliveira
authors.affiliation: Rehabilitation and Functional Performance, Faculty of Medicine at Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Luiz G
authors.initials: LG
authors.lastname: Cruz Gonçalves
authors.affiliation: Rehabilitation and Functional Performance, Faculty of Medicine at Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.|Biomechanics and Motor Control Lab (LaBioCoM), University of São Paulo, Ribeirão Preto, Brazil.|School of Physical Education and Sports of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Paulo R
authors.initials: PR
authors.lastname: Pereira Santiago
mesh_terms: D000328:Adult; D054874:Athletic Performance; D001938:Brazil; D005080:Exercise Test; D006801:Humans; D000073256:Information Technology; D008297:Male; D012420:Running / Q000502:physiology; D012916:Soccer / Q000502:physiology*; D055815:Young Adult