title: Gender-related differences in maximum mechanical power output in short-term activities in children and adolescents.
abstract: The study was designed to examine the gender-related differences in maximum mechanical power output in various short-burst activities during growth. The subject sample consisted of four subgroups: 9 boys (14.11 +/- 0.6 yr), 9 boys (10.67 +/- 0.71 yr), 7 girls (14.29 +/- 0.49 yr), 7 girls (10.57 +/- 0.54 yr). We measured peak power (PP), mean power (MP), fatigue index (FI) during 30-s WAnT, squat jump height (SJH) and power (SJP), and counter movement jump height (CMJH) and power (CMJP), maximum speed over 20-metre distance (S20). Lactation concentration was measured in the 3rd and 5th minutes after the WAnT Ratio normalisation and ANCOVA were used to remove the influence of the differences in muscle (MM) and body mass (BM). Male adolescents had higher absolute values of PP (P < 0.05), MP (P < 0.05) than female. Ratio normalisation showed that boys had higher PP/BM (P < 0.05), PP/MM (P < 0.05), MP/BM (P < 0.05), MP/MM (P < 0.06) than girls. The ANCOVA adjustment for MM showed differences between genders in PP (P < 0.001), MP (P < 0.001), SJH (P < 0.05), SJP (P < 0.05) and CMJP (P < 0.001), whereas the ANCOVA adjustment for BM showed differences only in PP (P < 0.001), MP (P < 0.001). Prepubertal boys had higher absolute values only in SJP (P < 0.05). We concluded that variations in body composition could not be the only key to gender-related differences in power output in short-burst activities.
authors.affiliation: University of Ljubljana, Faculty of Sport, Ljubljana, Slovenia. katja.tomazin@fsp.slovenia-lj.si
authors.forename: Katja
authors.initials: K
authors.lastname: Tomazin
authors.forename: Branko
authors.initials: B
authors.lastname: Skof
authors.forename: Ales
authors.initials: A
authors.lastname: Dolenec
authors.forename: Milan
authors.initials: M
authors.lastname: Coh
mesh_terms: D000293:Adolescent; D000693:Anaerobiosis; D001696:Biomechanical Phenomena; D001823:Body Composition; D002648:Child; D004734:Energy Metabolism; D005260:Female; D048788:Growth and Development / Q000502:physiology*; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D012727:Sex Characteristics