by Cyrus Shirazi Rising Junior at Bates College (Lewiston, ME) - - PowerPoint PPT Presentation

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Oct 30, 2022 351 likes •569 views

Relationship between Arm Slot and Various Pitching Metrics by Cyrus Shirazi Rising Junior at Bates College (Lewiston, ME) Political Science Major Many Thanks to: Rapsodo and Rockland Peak Performance Background: Delivery Angle

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Relationship between Arm Slot and Various Pitching Metrics

by Cyrus Shirazi

Rising Junior at Bates College (Lewiston, ME) Political Science Major

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Many Thanks to: Rapsodo and Rockland Peak Performance

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Background: “Delivery Angle Determines Pitch Movement: Evidence from Biomechanics and Pitch Tracking” – by Daniel Brooks, Glenn S. Fleisig and Harry Pavlidis “Arm Slots Revisited” - by Matt Lentzner “The Hardball Times: A Mechanical Model of Pitching” - by Matt Lentzner October 30, 2008 “Factors Determining the Spin Axis of a Pitched Fastball in Baseball” - by Jinji Tsutomo, Sakurai, Hirano. “Direction of Spin Axis and Spin Rate of the Pitched Baseball” - by Jinji Tsutomo, Sakurai

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Purpose of the study was to determine the impact of a pitcher’s arm-slot on various pitching metrics including: ➢ Velocity ➢ Total Spin and True (Useful) Spin ➢ Horizontal Break ➢ Vertical Break ➢ Spin Axis ➢ Total Linear Movement

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Equipment:

Rapsodo Camera System
Motus Sleeve and Sensor
60 ft. pitching mound

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Methodology:

Data collection

was performed as part of a Pitcher Development program at Rockland Peak Performance (RPP in Sloatsburg, NY)

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Methodology:

8 college-level pitchers
6 Weeks, bullpen sessions
2x per week
Synchronized Rapsodo data with Motus

Sleeve during recording

Collected over

2,000 Rapsodo data points, with 491 useable data points

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Summary of Data

Information collected with Rapsodo

camera included: ➢ Spin axis (hour clock) ➢ Velocity (mph) ➢ Total spin (rpm) ➢ True (Transverse) spin (rpm) ➢ Spin efficiency (%) ➢ Vertical and horizontal Break (in.)

Information collected with Motus Sleeve

➢ Arm slot

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Data Selection:

Data doesn’t care about pitch type, it just

gives you the facts

Research study focused on the upper right

hand quadrant-only where we could compare data in a specific region

4-seam FB
2-seam FB
Change-ups

Horizontal Axis Vertical Axis

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Summary of Data

Arm Slot (degrees) Velo (mph) Total spin (rpm) True Spin (rpm) Spin Efficiency (%) Average 55 77 1835 1718 94% Max 90 88 2297 2189 95% Min 23 65 1173 964 82%

Spin Axis Vertical Break (inches) Horizontal Break (inches) Linear Movement (inches) Average 1:08 15.8 10.5 19.0 Max 1:52 25.6 18.6 26.0 Min 0:04 1.3 1.2 14.6

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Velocity (mph)

Correlation Coefficient R = -0.09

Arm Slot (degrees)

Arm Slot vs. Velocity

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Total Spin (rpm)

Correlation Coefficient R = -0.02

Arm Slot (degrees)

Arm Slot vs. Total Spin

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True / Useful Spin (rpm)

Correlation Coefficient R = -0.04

Arm Slot (degrees)

Arm Slot vs. True Spin

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Vertical break (inches)

Correlation Coefficient R = 0.64

Arm Slot (degrees)

Arm Slot vs. Vertical Break

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Horizontal break (inches)

Correlation Coefficient R = -0.71

Arm Slot (degrees)

Arm Slot vs. Horizontal Break

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New Concept: Linear Movement

HB VB Total Linear Movement

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Total Linear Movement (inches)

Correlation Coefficient R = 0.00

Arm Slot (degrees)

Arm Slot vs. Linear Movement

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Correlation Coefficient R = -0.71

Arm Slot (degrees)

3:00 pm 2:00 pm 1:00 pm 12:00 pm

Hour Clock (spin axis)

Arm Slot vs. Spin Axis

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High Correlation

Spin Axis Vertical Break Horizontal Break

No Correlation

Velocity Total Spin True Spin Linear Movement

Arm Slot Correlation Review:

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Summary Conclusion

Arm slot:

➢ Significant influence on the direction of movement ➢ NO Influence on the amount of movement

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