Most stress fractures occur in the lower limbs and are rarely observed in the upper limbs. The second metacarpal is the longest of all the metacarpals and has the largest base, articulating with the trapezium, trapezoid, capitate, and third metacarpal. In athletes, stress fractures in non-weight bearing joints are uncommon. Therefore, the shaft of the second metacarpal bone undergoes a higher l...

Racquet sports have high levels of joint injuries suggesting the joint loads during play may be excessive. Sports such as badminton employ lateral sidestepping (SS) and crossover stepping (XS) movements which so far have not been described in terms of biomechanics. This study examined bilateral ground reaction forces and three dimensional joint kinetics for both these gaits in order to determin...

A simple model is presented to explain how the spin of a ball can be enhanced when the ball is incident obliquely on a flexible surface. The mechanism involves tangential distortion of the surface and a return of the elastic energy stored in the surface via the action of the static friction force on the ball. As an example, we consider the enhancement of the spin that is possible using an appro...

The present study investigated the heart rate response to playing tennis with special reference to the skill levels and ages of the participants. Data obtained in a similar manner during earlier studies of badminton and squash players were compared with that obtained during tennis. The number of rallies, mean rally time and actual playing time in 30 minutes of play was also compared for the dif...

the origins of sports traditionally dates back to its practice encouraged by religion, custom or militancy, and, therefore, was considered a wholly masculine practice. due to the inextricable link between sports and body management, nowadays, leisure and health have transcended their meaning beyond a certain gender and, consequently, sports has become a wholly ordinary practice for women. to at...

Background and Purpose. Treatment techniques involving perturbations of support surfaces may induce compensatory muscle activity that could improve knee stability and increase the likelihood of returning patients to high-level physical activity. The purpose of this study was to determine the efficacy of augmenting standard nonoperative anterior cruciate ligament (ACL) rehabilitation programs wi...

The message from the nation’s scientists is clear, unequivocal, and unified: physical inactivity is a risk factor for cardiovascular disease, and its prevalence is an important public health issue. New scientific knowledge based on epidemiological observational studies, cohort studies, controlled trials, and basic research has led to an unprecedented focus on physical activity and exercise. The...