ABSTRACT
The aim of this study was to examine the effect of defensive pressure on movement behaviour during an under-18 basketball game. 20 international male players (age: M=16.05, SD=2.09 years old; weekly practice: M=10.9, SD=1.94 h; playing experience: M=7.1, SD=1.1 years) played two 10-min basketball quarters, using man-to-man »-court for the first 4 min (F»), man-to-man full court defence for the next 3 min (FULL), and man-to-man »-court defence for the last 3 min (S»). The positional data were captured by the Ubisense Real Time Location System and analysed with non-linear signal processing methods (approximate entropy) and repeated measures ANOVA. There were differences in the regularity values between F» and FULL in distance to the basket and to the opponents' basket. A stronger in-phase attraction in both lateral and longitudinal directions was identified; however, the centroids (i. e., the mean position from all team players) were closer and revealed higher values of irregularity in lateral displacements for all defensive systems. The individual speed displacements became more coordinated with teammates, particularly in the offensive court. Overall, this study provided evidence on how changing the level of defensive pressure promotes different collective behaviours.
Subject(s)
Basketball/physiology , Competitive Behavior/physiology , Movement/physiology , Adolescent , Decision Making , Humans , Male , Time and Motion StudiesABSTRACT
This prospective study reports on the use of the Herbert screw for fixation of fractures and nonunions of the scaphoid through a dorsal approach. In cases of delayed union and nonunion, screw fixation was combined with bone grafting. Twenty-five patients were treated in this manner, and union rates of 100% for acute fractures and 87% for delayed union and nonunion were achieved. We believe that the dorsal approach provides ready access to the scaphoid, enabling placement of the screw in the best possible position to provide fracture fixation.
