Mobility Screen

Tyson is categorized as a “neutral” mover.  He sets up in a neutral spine position in his athletic stance.  In his pelvic tilt screen he was unable to create anterior or posterior tilt.  This is an indication there is lower abdominal/lower back weakness and/or lack of pelvic control.  He was limited in his pelvic disassociation screen but showed improvement with assistance (we held his shoulders).  This shows he has some rotary stability issues.  He was also limited in his torso disassociation but showed improvement with assistance (we held his hips).  This as well is a rotary stability issue.  He passed his overhead squat screen.  He was limited both bilaterally and unilaterally (short 2 inches on each leg respectively) on his toe touch screen.

Tyson created 75 degrees of thoracic rotation to the right and 75 degrees of thoracic rotation to the left.  In his thoracic side bend screen he was able to tilt 40 degrees to the right and 40 degrees to the left.  In his scapular retraction screen he was able to pull his elbows rearward 3 inches. In his lower quarter rotation screen he created 50 degrees of right internal hip rotation and 20 degrees of right external hip rotation.  He created 45 degrees of left internal hip rotation and 20 degrees of left external hip rotation.

Tyson has adequate range of motion internally and externally in both his right and left shoulders.  In his scapular palpation screen we were unable to get 4 fingers under his scapulas.  He passed his lat length/shoulder flexion screen as he was able to raise his arms overhead to the wall.  He passed his reach, roll, and lift screen showing good scapular strength in the upward rotated position.  He passed all impingement, wrist deviation, wrist flexion/extension, forearm supination/pronation, and cervical screens.

Tyson was able to balance on his right leg for 6 seconds in his single leg balance screen (eyes closed).  He did show ankle instability on that right side.  He was able to balance for 13 seconds ion his left leg in the same screen.  He passed his single leg glute bridge screen on both legs, but did show some core instability as his hips tilted.

Force Plate Swings

Below is video of the swing analysis. I will walk you through this matched up with video.

Tyson creates a whole foot pressure load in his rear foot.  He generates 95% body weight (625 N) of force vertically in his back leg.  He does a good job carrying this forward in his stride.  He creates a good counter rotation of the hip and generates 57 N of torque in the rear leg.  His lead leg vertical force is 133% body weight (973 N).  This is a low overall force and he also shows a low rate of force production.  His horizontal lead leg force is 94% body weight (617 N), which is a very good amount of force.  His rate of force development is average in this vector.  His x-axis timing is 10% which shows that he is accepting his weight before turning (this is more indicative of an off speed adjustment).

KVEST Sequencing & Rotational Speeds

The 3d readings are on kinematic sequencing and rotational speeds.

Tyson presents as an in sequence swing pattern (pelvis, torso, upper arm, wrist).  He does have large amount of torso inward rotation heading into first move at -40.73 degrees.  For him this will affect his ability to get his arms around his body.  His pelvis is moving at 748 deg/sec. which is a good speed for his hip size. He does have an average rate of deceleration of the pelvis and this can always be improved upon.  His torso is rotating at 934 deg/sec.  This is an average gain over the pelvis.  His gain to the upper arm however is minimal at 943 deg/sec.  He is disengaging his scapular load to get around an inwardly rotated torso.  This is in part due to the aforementioned rotary stability issues.  His wrist speed is 1713 deg/sec.

Bat Sensor Data

Tyson’s bat speed was 59 mph.  This is average but will be improved upon with better rotary stability and ground force production.  His time to impact was 160-170 milliseconds which is average to slightly below average.  Again his ability to control his range of motion and not get the hands pinned behind will allow for this time to decrease.  His rotational acceleration is 5-7 G’s which shows there is some looseness in the turn.  His attack angles were low at 5-7 degrees.  We would like to see these in the 8-15 degree range.  His vertical bat angles were -18 to -35 degrees.  We are looking for -20 to -30 in the top of the zone and -30 to -40 in the bottom of the zone.

Summary & Recommendations

• Dead bug progression to improve lower abdominal strength and pelvic control.

• Superman’s to improve lower back strength.

• Anti-Rotation work to improve rotary stability.

• Increase overall force production and rate of force production in the weight room (both bilaterally and unilaterally).  We also like to do rotary medicine ball throws for this.

• Manage rotary stability to match up with his mobility to allow his arms to not get pinned behind his turn.

• Manage attack angles with bat sensor to ensure time on plane.