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Full-Text Articles in Sports Sciences
Knee Valgus In Self-Initiated Vertical Jump Landings: Developmental And Gender Comparisons, Pamela J. Russell, Erik E. Swartz, Laura C. Decoster, Ron V. Croce
Knee Valgus In Self-Initiated Vertical Jump Landings: Developmental And Gender Comparisons, Pamela J. Russell, Erik E. Swartz, Laura C. Decoster, Ron V. Croce
Movement Arts, Health Promotion and Leisure Studies Faculty Publications
The study examined gender and developmental differences in knee valgus angle and external knee valgus moment at the time of maximal vertical ground reaction force (MGRFz) in self-initiated vertical jump (VJ) landings. Fifty-six subjects grouped by age (pre-pubescent (8-11 yrs); post-pubescent (19-29 yrs)) and gender jumped for a ball set at 50% of their maximum VJ height then landed on two feet with only their dominant foot on the force plate. Statistical analyses of motion analysis (3-D) and GRF data showed that children had greater valgus angles (p = .003) and moments (p = .026) at MGRFz compared to adults. …
Loading Rate In Self-Initiated Vertical Jump Landings: Developmental And Gender Comparisons, Pamela J. Russell, Erik E. Swartz, Ron V. Croce, Laura C. Decoster
Loading Rate In Self-Initiated Vertical Jump Landings: Developmental And Gender Comparisons, Pamela J. Russell, Erik E. Swartz, Ron V. Croce, Laura C. Decoster
Movement Arts, Health Promotion and Leisure Studies Faculty Publications
The study compared gender and developmental differences in vertical loading rate upon a two-footed landing from a self-initiated VJ. Fifty-seven subjects grouped by age (pre-pubescent (8-11 yrs); post-pubescent (19-29 yrs)) and gender consented to participate. Subjects jumped for a ball set at 50% of their maximum VJ height, and landed on two feet, facing forward, with only their dominant foot on the force plate. Motion analysis (3-D) and ground reaction force (GRF) data were collected. Statistical analyses indicated significant developmental differences in vertical loading rate normalized to kinetic energy, but no gender differences. Children may have higher loading rates because …