title: Relationship between measures of aerobic fitness, speed and repeated sprint ability in full and part time youth soccer players.
abstract: OBJECTIVE
  The aim of the study was to investigate the relationship between repeated sprint ability (RSA) involving changes in direction, short linear sprinting and aerobic capacity in young elite soccer players. A secondary aim was to assess any differences in performance of these assessments between players of different age groups.
  
  
  METHODS
  Thirty-two male adolescent soccer players belonging to the same elite club academy were assessed for RSA comprising 6 x 40m efforts interspersed by 25s recovery, linear sprinting speed over 15m, and aerobic capacity via the YYIE2 assessment.
  
  
  RESULTS
  There was a significant correlation between performance in the YYIE2 and RSA total time, RSA fastest sprint and RSA percentage decrement (r = -0.71, -0.53, and -0.52 respectively. P<0.05). Significant differences were observed between age groups for distance covered in the YYIE2, RSA total time and RSA fastest sprint (P<0.01). No significant differences were observed for short linear sprinting.
  
  
  CONCLUSIONS
  Assessments of RSA over 40m and incorporating changes of direction appear to be significantly correlated with YYIE2 performance in young elite level soccer players. In addition older players performed significantly better in the YYIE2 assessment and RSA protocol but not in short linear sprinting. These results have implications for the design of assessment protocols for young elite soccer players of different ages.
authors.affiliation: Centre for Sport and Exercise, Heriot-Watt University, Edinburgh, Scotland. n.gibson@hw.ac.uk
authors.forename: N
authors.initials: N
authors.lastname: Gibson
authors.forename: J
authors.initials: J
authors.lastname: Currie
authors.forename: R
authors.initials: R
authors.lastname: Johnston
authors.forename: J
authors.initials: J
authors.lastname: Hill
mesh_terms: D000293:Adolescent; D054874:Athletic Performance / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D008297:Male; D010807:Physical Endurance / Q000502:physiology; D010809:Physical Fitness / Q000502:physiology*; D012916:Soccer / Q000502:physiology*