Part Five: Summary
By Jim Fanara, CSCS
Elite high velocity shot makers take full advantage of momentum and impulse during the shot making kinematic sequence. The faster the forward momentum and the quicker it can be stopped, the greater the force transfer into the shot. High velocity shot makers can quickly decelerate forward momentum on a stabilized lead leg. This is the first step in turning forward momentum into rotational velocity.
The lower body creates an anchor upon which the upper body can “wind up” the shot. A stiffened core stabilizes the center-of-mass to efficiently transfer ground reaction forces from the hip complex into the arms. Lower velocity shot makers fail to stabilize their lead leg and have less control their COM.
Elite shot makers create separation between their torso and hip complexes during the shot and effectively brace from the core out. The separation of the upper and lower body engages the stretch reflex within the core muscle complex as the torso “winds up’ against the anchoring effect of the decelerated hips. The stretch reflex is like stretching a rubber band and letting go to create a snapping action. Engaging the stretch reflex within the core complex utilizes stored elastic energy thereby enhancing power production.
To capitalize on the power created by the stretch reflex, each body part lags behind the next as the shot sequence unwinds.
During each step of the lagged sequencing of shot mechanics, one body segment creates an anchor for the next in the sequence. The stiffening effect provides an anchor for the extremely rapid acceleration then deceleration of the torso transferring all the energy to the arms and stick. With the torso quickly stopped and locked down on the stable lower body the shot sequence unwinds the torso, then shoulders, then arms and then stick, culminating in the “cracking the whip” effect.
Power is lost if two segment rotate together. For example, if the arms don’t lag behind the shoulders, connective tissue does not “wind up” and energy is leaked so power is diminished.
Lower velocity shot makers lack hip/torso separation while shooting.
Running Speed
Given the kinematic sequencing of high velocity shots, it is clear that running speed is a factor in high velocity shot making. The greater the forward momentum, the greater the ground reaction force that can be sent into the hip complex and converted to rotational speed.