title: Basketball lay-up - foot loading characteristics and the number of trials necessary to obtain stable plantar pressure variables.
abstract: This study aimed (1) to profile the plantar loading characteristics when performing the basketball lay-up in a realistic setting and (2) to determine the number of trials necessary to establish a stable mean for plantar loading variables during the lay-up. Thirteen university male basketball players [age: 23.0 (1.4) years, height: 1.75 (0.05) m, mass: 68.4 (8.6) kg] performed ten successful basketball lay-ups from a stationary position. Plantar loading variables were recorded using the Novel Pedar-X in-shoe system. Loading variables including peak force, peak pressure, and pressure-time integral were extracted from eight foot regions. Performance stability of plantar loading variables during the take-off and landing steps were assessed using the sequential averaging technique and intra-class correlation coefficient (ICC). High plantar loadings were experienced at the heel during the take-off steps, and both the heel and forefoot regions upon landing. The sequential estimation technique revealed a five-eight trial range to achieve a stable mean across all plantar loading variables, whereas ICC analysis was insensitive to inter-trial differences of repeated lay-up performances. Future studies and performance evaluation protocols on plantar loading during basketball lay-ups should include at least eight trials to ensure that the measurements obtained are sufficiently stable.
authors.affiliation: a Physical Education and Sports Science Academic Group , National Institute of Education, Nanyang Technological University , Singapore.
authors.forename: YaoHui K
authors.initials: YK
authors.lastname: Chua
authors.affiliation: a Physical Education and Sports Science Academic Group , National Institute of Education, Nanyang Technological University , Singapore.
authors.forename: Raymond K K
authors.initials: RK
authors.lastname: Quek
authors.affiliation: a Physical Education and Sports Science Academic Group , National Institute of Education, Nanyang Technological University , Singapore.
authors.forename: Pui W
authors.initials: PW
authors.lastname: Kong
mesh_terms: D054874:Athletic Performance / Q000502:physiology*; D001490:Basketball / Q000502:physiology*; D001696:Biomechanical Phenomena; D005528:Foot / Q000502:physiology*; D006801:Humans; D008297:Male; D011312:Pressure; D055815:Young Adult
keywords: Performance stability; force; peak pressure; pressure–time integral; sequential estimation