title: Importance of muscle power variables in repeated and single sprint performance in soccer players.
abstract: This study examined the relationship between lower body power and repeated as well as single sprint performance in soccer players. The performance of nineteen male soccer players was examined. The first testing session included the countermovement jump (CMJL) and the progressive full squat (FSL), both with external loads. Power in the CMJL and FSL was measured with each load that was lifted. The second session included a protocol of 40-m repeated sprints with a long recovery period (2 min). The number of sprints executed until there was a 3% decrease in performance for the best 40-m sprint time was recorded as a repeated sprint index (RSI). The RSI was moderately associated with power output relative to body mass in the CMJL and FSL (r = 0.53/0.54, p ≤ 0.05). The most and least powerful players (determined by FSL) showed significant differences in the RSI (9.1 ± 4.2 vs. 6.5 ± 1.6) and 10 m sprint time (p ± 0.01). Repeated and single sprints are associated with relatively lower body power in soccer players.
authors.affiliation: Research Section, Murcia Soccer Federation, Murcia, Spain. ; INNOVA Health & Sport Institute, Murcia, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: López-Segovia
authors.affiliation: Tunisian Research Laboratory "Sport Performance Optimisation"-National Center of Medicine and Science in Sport (CNMSS)El Menzah, Tunisia. ; Santy Orthopedicae clinical, sport science and research department Lyon, France.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Dellal
authors.affiliation: Research Laboratory "Sport Performance Optimisation", National Center of Medicine and Science in Sport.
authors.forename: Karim
authors.initials: K
authors.lastname: Chamari
authors.affiliation: Department of Exercise Science, University of Pablo de Olavide, Seville, Spain.
authors.forename: Juan José
authors.initials: JJ
authors.lastname: González-Badillo
keywords: repeated-sprint ability; soccer; strength; testing; velocity