Forty-five young adult males were given 30 trials of Isometric
knee extension and 30 trials of isometric knee flexion. Each trial
consisted of a maximum of three second exertion followed by a 10
second intertrial rest interval. Subjects were ranked on the basis
of the mean of the first three...
The purpose of this research was to study the impact
phenomena of a tennis ball striking a hard surface.
Stroboscopic photography was used to collect the ball's
impact images from seven angles of incidence, ranging from
-23 degrees to -70 degrees with zero, top and back initial
spin respectively.
Through...