When a tennis ball rests on top of a basketball and both drop to the floor together, the tennis ball is projected vertically at high speed. A mass-spring model of the impact, as well as air track data, suggest that the tennis ball should be projected at relatively low speed. Measurements of the forces on each ball and the bounce of vertically aligned superballs are used to resolve the discrepan...

A systematic search of published reports was carried out in three electronic databases from 1966 on to identify relevant articles relating to tennis injuries. There were 39 case reports, 49 laboratory studies, 28 descriptive epidemiological studies, and three analytical epidemiological studies. The principal findings of the review were: first, there is a great variation in the reported incidenc...

Figure 15: The fixed and adaptive frame type arrangements for Garden sequence, along with the motion measurements that are made using the motion analysis based algorithm. Fixed Adaptive Figure 16: The fixed and adaptive frame type arrangements for Tennis sequence, along with the motion measurements that are made using the motion analysis based algorithm. 27 Figure 13: Scene change MSPE measure ...

BACKGROUND The use of performance enhancing drugs is still a major problem in competitive sports. Even though tennis is not affected by systematic doping, there is lack of scientific evidence on the effect of sanctions on players` career. The aim of this study was to analyze male tennis players' career after a doping sanction. METHODS All doping offences committed by male professional tennis ...

BACKGROUND Pregnancy may stress calcium economy in women through fetal calcium requirements, and increasing maternal body weight. Bone is stimulated by compression forces. Playing tennis may decrease bone resorption through intermittent mechanical loading. This study tests the thesis that maternal bone mineral changes during pregnancy in women who play tennis are less compromised compared with ...

CONTEXT Wheelchair tennis has been identified as a high-risk sport for shoulder injury, so understanding shoulder pathology in these athletes is important. OBJECTIVE This study investigated the incidence and pattern of shoulder injuries in wheelchair tennis players using high-resolution ultrasonography. DESIGN Descriptive study. SETTING International Wheelchair Tennis Open. PARTICIPANTS...

Background & purpose: Most sports individuals or athletes including tennis players perform stretching during warm-up prior to physical activity in order to prevent injuries and enhance sports performance by improving flexibility. Traditionally static stretching exercises have been a prominent feature of warm up routines. On the other hand, dynamic stretching improves knee joint position sense, ...

Injuries that required physical or medical assistance were recorded for participants at the United States Tennis Association National Boys' Tennis Championships from 1986-1988, 1990-1992 (N = 1440, 240 athletes per year). Over the 6-yr period, a total of 304 athletes (or 21.1%) sustained new or recurrent injuries that required evaluation by the medical team. New injuries alone numbered 145 (inc...

Background Scientific data on the performance of collegiate female tennis players during the menstrual phases are scarce. Trial design Double-blind, counter-balanced, crossover trials were conducted to examine whether tennis performance was affected during menstruation, with and without dehydroepiandrosterone sulfate (DHEA-S) supplementation. Methods Ten Division 1 collegiate tennis players...

Artificial intelligence technology has rapidly developed; it has already fused into all walks of life. The paper applies artificial intelligence knowledge to make diagnosis and evaluation on China men table tennis players’ competition technical and tactics, the paper firstly briefly introduces artificial intelligence method and decision-making tree, rough set, artificial neural network, and the...