For an individual athlete, jumping performance is only moderately sensitive to deviations from the optimum take-offtechnique. Google
Run-up speed is very important, but an athlete must make subtle changes to the take-offtechnique as his run-up speed increases. Google
It is tempting to speculate that the particular take-off technique used in volleyball may cause loading patterns that are more likely to cause jumper's knee than those observed in many other sports. Google