The Baseball Performance Lab (BPL) and The Golf Lab produced a technical report analyzing MLB outfielder Randy Arozarena using an 8‑sensor, 240 Hz AMM 3D motion capture system (upper body and bat only). The study comprises two parts: (1) Bat Testing, comparing a measured 34‑in, 31.5‑oz “Light Bat” (5 uncued swings) with an unmeasured “Dark Bat” (3 uncued swings); and (2) Movement Testing, contrasting 8 uncued baseline swings (pooled across both bats) with 5 swings performed under a pelvis‑tuck cue. For each group, blended kinematic sequences were generated, and three impact metrics were extracted at contact: sweet‑spot bat speed, vertical bat angle, and angle of attack. Findings: the Dark Bat showed higher average bat speed (73.3 mph vs 69.5 mph) but with high variability; it also exhibited a steeper vertical bat angle and more downhill attack angle. The pelvis‑tuck cue produced a clear ~8° shift in angle of attack (from –3.5° to +4.2°) while bat speed remained unchanged (71 mph) and vertical bat angle flattened slightly. Sample sizes are small, leg data are missing, and one bat’s specifications are unknown, so results are presented as directional. The report recommends a larger, cleaner capture to confirm the cue’s effect.
Topics
Bat Testing Methodology and Sensor Setup
Details the 8‑sensor AMM 3D capture configuration, swing alignment at contact, and blending process for the Light Bat and Dark Bat groups.