title: The effect of concurrent training organisation in youth elite soccer players.
abstract: OBJECTIVE
  This study compared the adaptive responses to two concurrent training programmes frequently used in professional soccer.
  
  
  METHODS
  Fifteen youth soccer players (17.3 ± 1.6 years, 1.82 ± 0.06 m, 77.0 ± 7.3 kg; VO2 peak, 62.0 ± 4.7 ml(-1) kg(-1) min(-1)) who compete in the English Premier League volunteered for this study. In addition to completing their habitual training practices, the participants were asked to alter the organisation concurrent training by performing strength (S) training either prior to (S + E, n = 8) or after (E + S, n = 7) soccer-specific endurance training (E) 2d wk(-1) for 5 wk(-1).
  
  
  RESULTS
  With the exception of 30 m sprint, IMVC PF, quadriceps strength (60°/s(CON), 180°/s(CON), 120°/s(ECC)) pooled data revealed training effects across all other performances measures (P < 0.05). Whilst ANCOVA indicated no significant interaction effects for training condition, the difference between the means divided by the pooled standard deviation demonstrated large effect sizes in the E + S condition for in HBS 1-RM [S + E vs E + S; -0.54 (9.6 %) vs -1.79 (19.6 %)], AoP-M [-0.72 (7.9 %) vs -1.76 (14.4 %)], SJ [-0.56, (4.4 %), vs -1.08, (8.1 %)], IMVC-LR; [-0.50, (20.3 %) vs -1.05 (27.3 %)], isokinetic hamstring strength 60°/s (CON) [-0.64, (12.2 %) vs -0.95 (19.2 %)], 120°/s(ECC) [-0.78 (27.9 %) vs -1.55 (23.3 %)] and isokinetic quadriceps strength 180°/s (CON) [-0.23 (2.5 %) vs -1.52 (13.2 %)].
  
  
  CONCLUSIONS
  Results suggest the organisation of concurrent training, recovery time allocated between training bouts and the availability nutrition may be able to modulate small but clinically significant changes in physical performance parameters associated with match-play. This may have practical implications for practitioners who prescribe same day concurrent training protocols.
authors.affiliation: Department of Health Sciences, Liverpool Hope University, Liverpool, L16 9JD, UK. enrighk@hope.ac.uk.|Medical and Exercise Science Department, Wolverhampton Wanderers Football Club, Wolverhampton, UK. enrighk@hope.ac.uk.
authors.forename: Kevin
authors.initials: K
authors.lastname: Enright
authors.affiliation: Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Tom Reilly Building, Byrom St Campus, Liverpool, L3 3AF, UK.
authors.forename: James
authors.initials: J
authors.lastname: Morton
authors.affiliation: Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Tom Reilly Building, Byrom St Campus, Liverpool, L3 3AF, UK.|The Football Association, St. George's Park, Newborough Road, Needwood, Burton upon Trent, Staffordshire, DE13 9PD, UK.|Medical and Exercise Science Department, Wolverhampton Wanderers Football Club, Wolverhampton, UK.
authors.forename: John
authors.initials: J
authors.lastname: Iga
authors.affiliation: Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Tom Reilly Building, Byrom St Campus, Liverpool, L3 3AF, UK.
authors.forename: Barry
authors.initials: B
authors.lastname: Drust
mesh_terms: D000293:Adolescent; D054874:Athletic Performance / Q000502:physiology*; D006801:Humans; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D055070:Resistance Training / Q000379:methods*; D012420:Running / Q000502:physiology; D012916:Soccer / Q000502:physiology*; D055815:Young Adult
keywords: Concurrent training; Muscle architecture; Soccer; Strength training