Anthony Brady Profile picture
Jan 7, 2019 10 tweets 4 min read Read on X
THREAD: Biomechanics & How we breakdown the motion capture report at Driveline and communicate that info to the athlete w/drill recommendation.

Taken from my mini-talk presentation at ABCA.

1. We record motion capture data from the athlete and recreate the 3d model in #Visual3d
2. We then apply physics to that model to obtain the kinematics and kinetics. These metrics are then organized into the report. Notes are then generated to help the athlete make sense of it all

Page 1: Cover page with athlete information

Page 2: Throwing Arm Kinematic Positions ImageImage
Athlete Notes:
“Efficient upper body kinematic positions from foot plant through ball release. Creating a large amount of shoulder horizontal abduction (44 degs of scap load). Efficient shoulder abduction path from foot plant (90 degs) to ball release (90 degs).”
Page 3: Torso and Lower Body Kinematic Positions

- Early lateral trunk tilt
- Trunk opening early into foot plant
- Below average hip/shoulder separation

- hip/shoulder separation can be seen visually as the distance between the purple (pelvis angle) and red (trunk angle) line
Kinematic Sequencing Page:

Everything appears to be in order sequentially. However, it looks like the delay from peak pelvis to peak torso angular velocity has room to improve. We want there to be greater distance between the purple (peak pelvis) and red (peak trunk) arrow.
Athlete Notes:
“Trunk lacks counter-rotation at foot plant combined with early lateral trunk tilt. Hip/shoulder separation (23 degs) and timing between peak pelvis and peak torso angular velocity (0.0229 secs) are below average with room to improve.”
Page 4: Kinematic Velocities

- Lead Knee Extension velocity is well above average
- All other kinematic velocities appear to be within normal ranges
Athlete Notes:
“Making up for poor hip/shoulder separation and sequencing with great lead leg block (610 deg/sec lead knee extension angular velocity) and linear momentum transfer. All other kinematic velocities within normal to above average ranges”
Key Notes for the Athlete:
"Hip/shoulder separation and sequencing have room to improve. Mainly a product of the trunk leaking a bit early, not holding counter-rotation into foot plant. Rotational transfer of momentum is below average." Image
Drill Suggestion and Focus:
"Roll-ins are going to be the best drill for you right now. You can emphasize holding trunk counter-rotation and getting into better positions at foot plant to efficiently transfer momentum rotationally."

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More from @BaseballFreak_9

Dec 30, 2021
A couple weeks ago, I went though our assessment process at @DrivelineBB to prepare for defending my PIL triple crown title next year. It's impossible to cover it all in one thread, but we'll start here

Alias: Cliff Holmes
HT: 5'11
WT: 230.9 lbs😬
156 days til Studs season
Motion Capture Assessment.

Peak Velo: 90.4 mph. Not bad for throwing in your underwear with 48 reflective markers on you (not as hard as when I was throwing at the @WakePitchingLab later that week but still a solid starting point.
Why is the mocap report so important?

I think @sayhomies put it best in a convo we had last month.

"When I was playing and things were going well/I was throwing hard I always wanted a snapshot of where I was in that moment to return to if I ever got lost"
Read 25 tweets
Jan 25, 2019
THREAD: Biomechanics breakdown for YELLOW

received 12% of the votes, and actually ended up throwing 92.4 mph, the second hardest of the 4.

what some voters said:

"more explosive lower body"
"quick arm path"
"opens hips last"
"stays closed longest"
"greatest impulse on ball"
Here's the breakdown on Yellow. First, here's a few angles of his mechanics
We'll start with the upper body kinematic positions:

Arm action notes:
- Elbow flexion stays clean and compact
- abduction is a little high at foot plant (>100 degs). Oftentimes, this limits scap load, but in Yellows case, he still creates >50 degs of shoulder horiz abduction.
Read 6 tweets
Jan 16, 2019
THREAD w/ breakdown below:

The voting has ended!
- nearly 5,000 votes
- The most voted for was Blue at 46% and he actually threw the slowest: 90.9 mph 🤔
- Green was the winner at 95 mph!
- pitching mechanics are hard

Some thoughts and a breakdown of Green's mechanics below ⬇️
There were over 200+ comments on the original poll with tons of ideas about pitching mechanics and why you thought your vote was the hardest thrower. As everyone hopefully learned, it's a lot harder than it looks. Much of pitching and baseball coaching that exists is a "guess"
Why would you leave your development as a player to a guess? That's the power of biomechanics integrated w/ the assessment. It eliminates that guessing game. We quantify and measure everything. Every movement, metric, frame, etc. Just raw objective data and numbers.
Read 12 tweets
Dec 30, 2018
BIOMECHANICS THREAD (long one, strap in):

Integrating assessment data into programming and using retest data to make sure we're on the right track: Changing Shoulder Abduction.

From a blog that @Bryan__Leslie and I wrote (edited by @OC____ ):

drivelinebaseball.com/2018/12/changi…
Within the biomechanics reports, we obtain various kinematic metrics of the upper and lower body during the throwing motion.

Today, we're going to focus on shoulder abduction, a primary metric for arm path. The angle between the humerus and the torso in the frontal plane.
We’ve seen, on average, elite throwers are more consistent with their shoulder abduction from front-foot contact through ball release—almost as if their elbows and shoulders rotate on the same plane as one another.
Read 20 tweets

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