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Technical Details

  • Variable Type: Event
  • Data Type: Integer
  • Units: Frame number
  • Column Name: initiation_event
  • Required for QA: False
  • Measurement: the low point of the non-dominant hand before Ball Release

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Description

Initiation marks the very beginning of the serve when the player starts the motion by identifying the low point of the non-dominant hand before ball release. This event defines the start of the Preparation phase and is used for phase duration calculations.

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Use Cases

  • Serve phase timing analysis
  • Preparation phase duration (initiation to ball release)
  • Full serve duration (initiation to termination)