title: Leg muscle power in 12-year-old black and white Tunisian football players.
abstract: This study examined leg muscle power of young male Tunisian black and white football players and extended the analysis to determine whether there is a relationship between cycling peak power output (PPO) and some field tests. A total of 113 children (white group (WG) = n = 56; black group (BG) = n = 57) participated in this investigation. Anthropometric data included age, body mass (BM), height, leg length (LL), body mass index (BMI), and leg muscle volume (LMV). Cycling PPO was measured including a force-velocity test. Peak power output (PPO; W and W/kg), Fopt (optimal braking force), and Vopt (optimal velocity) were significantly higher in the WG compared with the BG (p < 0.05). However, jump and sprint performances of the BG were significantly higher than the WG (p < 0.05). Multiple stepwise regression with anthropometric variables and the extrapolated values of the force-velocity test as explanatory factors showed that 33% of the variance of PPO of BG was explained by qualitative factors that may be related to cycling skill, muscle composition, and socioeconomic and training status.
authors.affiliation: Department of Physiology and Lung Function Testing, Faculty of Medicine Ibn El Jazar, Sousse, University of Centre, Tunisia. ben.ayedk1@yahoo.fr
authors.forename: Karim
authors.initials: K
authors.lastname: Ben Ayed
authors.forename: Imed
authors.initials: I
authors.lastname: Latiri
authors.forename: Eric
authors.initials: E
authors.lastname: Dore
authors.forename: Zouhair
authors.initials: Z
authors.lastname: Tabka
mesh_terms: D000886:Anthropometry; D056352:Athletes; D044383:Black People; D002648:Child; D006801:Humans; D007866:Leg / Q000502:physiology*; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D012420:Running / Q000502:physiology; D012916:Soccer / Q000502:physiology*; D014416:Tunisia; D044465:White People