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Technical Details

  • Variable Type: Event
  • Data Type: Integer
  • Units: Frame number
  • Column Name: `low_arm_event’
  • Required for QA: False
  • Measurement: Frame at which the dominant arm reaches its lowest point before the upward swing between Ball Release and Apex events

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Description

Low Arm marks the instant when the dominant (serving) arm reaches its lowest point during the preparation phase, after Ball Release and before the Cocking phase. It defines the end of the loading phase and the start of the cocking phase.

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Use Cases

  • Loading phase duration (ball release to low arm)
  • Cocking phase start (low arm to max shoulder ER)
  • Serve rhythm and timing