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Kinematic sequence patterns in the overhead baseball pitch.

Donna Moxley Scarborough1,2, Ashley J Bassett3, Lucas W Mayer1

  • 1Department of Orthopaedic Surgery, Massachusetts General Hospital , Boston, MA, USA.

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Summary
This summary is machine-generated.

Baseball pitchers rarely achieve the ideal proximal-to-distal kinematic sequence for efficient energy transfer. This variability in throwing mechanics may offer insights into injury risk, though optimal patterns remain undetermined.

Keywords:
Pitchingbiomechanicskinetic chain

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Area of Science:

  • Biomechanics
  • Sports Science
  • Orthopedics

Background:

  • Efficient baseball pitching relies on a proximal-to-distal transfer of segmental angular velocity.
  • This kinematic sequence optimizes ball velocity and minimizes stress on the throwing arm's musculoskeletal structures.
  • Deviations from this ideal sequence have been linked to increased injury risk in pitchers.

Purpose of the Study:

  • To evaluate the variability of kinematic sequences in baseball pitches.
  • To analyze the timing patterns of peak angular velocity across different body segments during pitching.
  • To explore the relationship between kinematic sequence variability and pitcher skill level.

Main Methods:

  • Three-dimensional biomechanical analyses of 208 fastball pitches from 22 pitchers (high school, collegiate, professional).
  • Measurement of the timing of peak angular velocity for five body segments: pelvis, trunk, arm, forearm, and hand.
  • Identification and categorization of different kinematic sequence patterns observed.

Main Results:

  • No pitches demonstrated a perfect proximal-to-distal kinematic sequence.
  • Fourteen distinct kinematic sequence patterns were identified, with 'pelvis → trunk → arm → hand → forearm' being the most common.
  • Kinematic sequence variability was comparable between high school and professional pitchers.
  • Over 90% of pitchers exhibited more than one kinematic sequence pattern across their pitches.

Conclusions:

  • The ideal proximal-to-distal kinematic sequence is not consistently achieved by baseball pitchers.
  • Kinematic sequence variability is prevalent across all competitive levels and may be a factor in injury risk assessment.
  • Further research is needed to determine the optimal kinematic sequence and its variability for maximizing performance and minimizing injury in baseball pitching.