Therefore , 6 instantaneous values of hip velocity were obtained within 2 frames and then averaged .
_ The hip velocity at hand entry into the water was calculated from the hip position 3 frames before and 3 frames after the hand entry .
6 instantaneous values of hip velocity were obtained within 2 frames and then averaged .
_ The hip velocity at hand entry into the water was calculated from the hip position 3 frames before and 3 frames after the hand entry .