title: Reliability of lower limb biomechanics in two sport-specific sidestep cutting tasks.
abstract: The purpose of this study was to assess the within- and between-session reliability of lower limb biomechanics in two sport-specific sidestep cutting tasks performed by elite female handball and football (soccer) athletes. Moreover, we aimed at determining the minimum number of trials necessary to obtain a reliable measure. Nineteen elite female handball and 22 elite female football (soccer) athletes (M ± SD: 22 ± 4 yrs old, 168 ± 5 cm, 66 ± 8 kg) were tested. The reliability was quantified by intra-class correlations (ICCs), typical error and Spearman's rank correlation. Only minor improvements in ICC values were seen when increasing the number of trials from 3 to 5. Based on trials 1-3, all variables showed good to excellent within-session reliability (M ICC: 0.91, 95% CI: 0.89-0.93), fair to good between-session reliability (M ICC: 0.73, 95% CI: 0.70-0.76), moderately positive between-session rank correlation coefficients (M: 0.72, 95% CI: 0.69-0.76). A few frontal plane biomechanical variables displayed lower between-session reliability in the football task compared with the handball task. The moderately positive between-session ranking and practically small typical error implies that the measurements could reliably reproduce the ranking of individuals in multiple-session studies. Adequate reliability could be attained from 3 trials, with only minor improvements when adding more trials.
authors.affiliation: a Oslo Sports Trauma Research Center , Norwegian School of Sport Sciences , Oslo , Norway.|b Department of Orthopaedics and Traumatology , Prince of Wales Hospital, Faculty of Medicine, The Chinese University of Hong Kong , Hong Kong , China.
authors.forename: Kam-Ming
authors.identifier: http://orcid.org/0000-0003-2185-6468
authors.initials: KM
authors.lastname: Mok
authors.affiliation: a Oslo Sports Trauma Research Center , Norwegian School of Sport Sciences , Oslo , Norway.
authors.forename: Roald
authors.initials: R
authors.lastname: Bahr
authors.affiliation: a Oslo Sports Trauma Research Center , Norwegian School of Sport Sciences , Oslo , Norway.
authors.forename: Tron
authors.initials: T
authors.lastname: Krosshaug
mesh_terms: D001696:Biomechanical Phenomena / Q000502:physiology; D005260:Female; D006801:Humans; D035002:Lower Extremity / Q000502:physiology*; D008297:Male; D009048:Motor Skills / Q000502:physiology*; D015203:Reproducibility of Results; D012916:Soccer / Q000502:physiology; D013177:Sports / Q000502:physiology*; D013996:Time and Motion Studies; D055815:Young Adult
keywords: 3D motion analysis; elite female athletes; kinematics and kinetics; screening task; test–retest