Inspect3D Tutorial: Analysis of Baseball Hitters at Different Levels of Competition

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Abstract

The OpenBioMechanics project is an initiative started by Driveline Baseball Research & Development, and provides the general public a marker-based motion capture data set of 100 pitchers and 98 hitters at different levels of competition [1].

The authors provide raw data without any reports or analysis, allowing the general public to use it as they see fit. While numerous scholarly articles provide in depth looks into the biomechanics of the baseball swing [2], there is a noticeable scarcity in articles that delve into biomechanical disparities between various levels of competition, such as contrasting differences between college and high school baseball players.

This tutorial is designed to demonstrate the use of Inspect3D to analyze the variance in pelvic angular velocity in internal/external rotation between high Blast bat speed [3] among college and high school baseball players.

Data

The OpenBiomechanics data set provides cleaned c3d files with 3D kinematic data for 47 body markers, 22 lower limb and pelvic markers, and 25 head, upper limb, and trunk markers; there are also 10 markers placed along the bat. Important metadata that is being considered are highest_playing_level, the level of competition that the subject is currently competing at, and blast_bat_speed_mph_x, the bat speed at contact as measured by Blast Motion sensor in miles per hour. For this tutorial, only the baseball_hitter data set will be analyzed.

To follow along with this tutorial, please go complete the Building CMZs Files tutorial. If you would like to skip the build CMZs Files and MetaData tutorials, you can:

  • Download this pre-built CMZ workspace.
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