Red line represents tangential velocity of the hand at contact. It will be proportional to approach speed. It is further hypothesized that this forward somersaulting rotation will be proportional to approach speed. Black line represents global radius of rotation. Red line represents tangential velocity of the hand at contact.
Black line represents global radius of rotation.
Red line represents tangential velocity of the hand at contact. It is hypothesized that this cartwheeling rotation is responsible for the increased incidence of one-legged landings and may therefore be a contributing factor to lower extremity injury. Effects of approach speed on angular momentum With increases in horizontal approach speed, forward somersaulting angular momentum is likely to increase. In consideration of generating ball speed upon contact, it would be highly beneficial for the volleyball attacker to possess such angular momentum. Any increase in forward somersaulting rotation, for a given arm position at contact, would result in an increased ball speed upon contact.