title: Reliability of squat and countermovement jump tests in children 6 to 8 years of age.
abstract: The aim of this study was to determine the reliability of the squat jump test (SJ) and countermovement jump test (CMJ), in fifty-six children (30 girls and 26 boys) with ages ranging from 6 to 8 years. Each subject performed two evaluation sessions (T1, T2) with seven days between tests. The results show that the CMJ test has a high intratrial reproducibility in T1 and T2 measured through intraclass correlation coefficient (ICC ≥ 0.95). The ICC for the SJ test had a high value (0.99) only in T1. The variability for both tests among children under 9 years of age is higher than those reported for adult subjects in other studies. The intersession reliability was questionable with a high methodical error (ME= 9.86-15.1%, for the SJ and CMJ, respectively) and a significant worsening of the results of CMJ in T2 (p < .05).
authors.affiliation: Faculty of Sport Science and Physical Education (INEF Galicia), University of A Coruña, Coruña, Spain.
authors.forename: Rafael Martin
authors.initials: RM
authors.lastname: Acero
authors.forename: Miguel
authors.initials: M
authors.lastname: Fernández-del Olmo
authors.forename: Jose Andres
authors.initials: JA
authors.lastname: Sánchez
authors.forename: Xose Luis
authors.initials: XL
authors.lastname: Otero
authors.forename: Xavier
authors.initials: X
authors.lastname: Aguado
authors.forename: Ferran A
authors.initials: FA
authors.lastname: Rodríguez
mesh_terms: D002648:Child; D005080:Exercise Test / Q000592:standards; D005260:Female; D006801:Humans; D007866:Leg / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology; D009119:Muscle Contraction / Q000502:physiology*; D015203:Reproducibility of Results; D013223:Statistics as Topic; D013997:Time Factors