title: Influence of oxygen uptake kinetics on physical performance in youth soccer.
abstract: OBJECTIVE
  To examine the relationship between oxygen uptake kinetics (VO2 kinetics) and physical measures associated with soccer match play, within a group of highly trained youth soccer players.
  
  
  METHODS
  Seventeen highly trained youth soccer players (age: 13.3 ± 0.4 year, self-assessed Tanner stage: 3 ± 1) volunteered for the study. Players initially completed an incremental treadmill protocol to exhaustion, to establish gaseous exchange threshold (GET) and VO2max (59.1 ± 5.4 mL kg(-1) min(-1)). On subsequent visits, players completed a step transition protocol from rest-moderate-intensity exercise, followed by an immediate transition, and from moderate- to severe-intensity exercise (moderate: 95 % GET, severe: 60 %∆), during which VO2 kinetics were determined. Physical soccer-based performance was assessed using a maximal Yo-Yo intermittent recovery test level 1 (Yo-Yo IR1) and via GPS-derived measures of physical soccer performance during soccer match play, three 2 × 20 min, 11 v 11 matches, to gain measures of physical performance during soccer match play.
  
  
  RESULTS
  Partial correlations revealed significant inverse relationships between the unloaded-to-moderate transition time constant (tau) and: Yo-Yo IR1 performance (r = -0.58, P = 0.02) and GPS variables [total distance (TD): r = -0.64, P = 0.007, high-speed running (HSR): r = -0.64, P = 0.008 and high-speed running efforts (HSReff): r = -0.66, P = 0.005].
  
  
  CONCLUSIONS
  Measures of VO2 kinetics are related to physical measures associated with soccer match play and could potentially be used to distinguish between those of superior physical performance, within a group of highly trained youth soccer players.
authors.affiliation: Faculty of Health Sciences, Staffordshire University, Stoke-on-Trent, ST4 2DF, UK.|Edge Hill University, Ormskirk, UK.
authors.forename: Greg
authors.initials: G
authors.lastname: Doncaster
authors.affiliation: Liverpool Hope University, Liverpool, UK.
authors.forename: Simon
authors.initials: S
authors.lastname: Marwood
authors.affiliation: Liverpool John Moores University, Liverpool, UK.|The Football Association, London, UK.
authors.forename: John
authors.initials: J
authors.lastname: Iga
authors.affiliation: Faculty of Health Sciences, Staffordshire University, Stoke-on-Trent, ST4 2DF, UK. v.unnithan@staffs.ac.uk.
authors.forename: Viswanath
authors.initials: V
authors.lastname: Unnithan
mesh_terms: D054874:Athletic Performance / Q000502:physiology*; D005260:Female; D006801:Humans; D007700:Kinetics; D008297:Male; D008657:Metabolic Clearance Rate; D010100:Oxygen / Q000378:metabolism*; D010101:Oxygen Consumption / Q000502:physiology*; D011659:Pulmonary Gas Exchange / Q000502:physiology*; D015203:Reproducibility of Results; D012420:Running / Q000502:physiology*; D012680:Sensitivity and Specificity; D012916:Soccer / Q000502:physiology*
chemical_list: D010100:Oxygen
keywords: Intermittent exercise; Team sports; VO2 kinetics; Youth soccer