title: Changes in repeated-sprint performance in relation to change in locomotor profile in highly-trained young soccer players.
abstract: The aim of this study was to examine the effects of changes in maximal aerobic (MAS) and sprinting (MSS) speeds and the anaerobic reserve (ASR) on repeated-sprint performance. Two hundred and seventy highly-trained soccer players (14.5 ± 1.6 year) completed three times per season (over 5 years) a maximal incremental running test to approach MAS, a 40-m sprint with 10-m splits to assess MSS and a repeated-sprint test (10 × 30-m sprints), where best (RSb) and mean (RSm) sprint times, and percentage of speed decrement (%Dec) were calculated. ASR was calculated as MSS-MAS. While ∆RSb were related to ∆MSS and ∆body mass (r(2) = 0.42, 90%CL[0.34;0.49] for the overall multiple regression, n = 334), ∆RSm was also correlated with ∆MAS and ∆sum of 7 skinfolds (r(2) = 0.43 [0.35;0.50], n = 334). There was a small and positive association between ∆%Dec and ∆MAS (r(2) = 0.02 [-0.07;0.11], n = 334). Substantial ∆MSS and ∆MAS had a predictive value of 70 and 55% for ∆RSm, respectively. Finally, ∆ASR per se was not predictive of ∆RSm (Cohen's = +0.8 to -0.3 with increased ASR), but the greater magnitude of ∆RSm improvement was observed when MSS, MAS and ASR increased together (0.8 vs. +0.4 with ASR increased vs. not, additionally to MSS and MAS). Low-cost field tests aimed at assessing maximal sprinting and aerobic speeds can be used to monitor ∆RS performance.
authors.affiliation: a Sport Science Department , Aspire, Academy for Sports Excellence , Doha , Qatar.
authors.forename: Martin
authors.initials: M
authors.lastname: Buchheit
authors.forename: Alberto
authors.initials: A
authors.lastname: Mendez-Villanueva
mesh_terms: D000293:Adolescent; D054874:Athletic Performance / Q000502:physiology*; D015992:Body Mass Index; D005080:Exercise Test; D006801:Humans; D008124:Locomotion / Q000502:physiology*; D008137:Longitudinal Studies; D008297:Male; D010806:Physical Education and Training; D012420:Running / Q000502:physiology*; D012885:Skinfold Thickness; D012916:Soccer / Q000502:physiology*
keywords: anaerobic speed reserve; football association; maximal aerobic speed; maximal sprinting speed; repeated-sprint ability