Sharief Hendricks

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The velocity and acceleration at which the ball-carrier or tackler enters the tackle may contribute to winning the contest and prevailing injury free. Velocity and acceleration have been quantified in controlled settings, whereas in match-play it has been subjectively described. The purpose of this study was to determine the velocity and acceleration of the(More)
BACKGROUND In 2012, the South African Rugby Union (SARU) approved a new set of scrum laws for amateur rugby played in the country, to be implemented at the start of the 2013 rugby season. These law changes were primarily based on the relatively high proportion of scrum-related catastrophic injury data collected as part of the BokSmart National Rugby Safety(More)
BACKGROUND The purpose of this study was to assess factors that influence physical activity (PA) levels during break-times in South African primary school children. METHODS The System for Observing Play and Leisure Activities in Youth (SOPLAY) was used to observe PA levels during break-times at low-income schools (4 intervention, 4 control). The(More)
The most frequently occurring contact events in rugby union are the tackle and ruck. The ability repeatedly to engage and win the tackle and ruck has been associated with team success. To win the tackle and ruck, players have to perform specific techniques. These techniques have not been studied at the highest level of rugby union. Therefore, the purpose of(More)
BACKGROUND The neighborhood environment has the potential to influence children's participation in physical activity. However, children's outdoor play is controlled by parents to a great extent. This study aimed to investigate whether parents' perceptions of the neighborhood environment and the objectively measured neighborhood environment were associated(More)
BACKGROUND Overweight and obesity among young South African (SA) children have reached concerning levels. Preschool interventions to promote physical activity (PA) and reduce sedentary behavior (SB) could help curb these trends. However, research has not been conducted to assess these behaviors in SA preschools and how these might differ across income(More)
OBJECTIVE To determine the concussion incidence and to identify factors associated with concussion in South African youth rugby union players. DESIGN Prospective cohort study. SETTING Injury surveillance was completed at the South African Rugby Union Youth Week tournaments (under-13, under-16, and under-18 age groups). PARTICIPANTS South African youth(More)
The ability of the attacking team to break through the defensive line is a key indicator of success as it creates opportunities to score tries. The aim of this study was to analyse line breaks and identify the associated skills and playing characteristics. The 2013 Super Rugby season (125 games) was analysed, in which 362 line breaks were identified and(More)
BACKGROUND Understanding the mechanism of injury is necessary for the development of effective injury prevention strategies. Video analysis of injuries provides valuable information on the playing situation and athlete-movement patterns, which can be used to formulate these strategies. Therefore, we conducted a video analysis of the mechanism of concussion(More)
OBJECTIVES To assess the impact of a whole-of-school health promotion program targeting healthy eating and physical activity on physical fitness levels, and physical activity-related knowledge, attitudes and behavior of primary school children. METHODS Sixteen primary schools were randomly assigned as intervention (N = 8) and control (N = 8) schools. A(More)