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Technical Details

  • Variable Type: Event
  • Data Type: Integer
  • Units: Frame number
  • Column Name: takeoff_frame
  • Required for QA: True
  • Measurement: Last frame of ground contact before flight

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Description

Takeoff marks the instant when the athlete leaves the ground, ending the jumping concentric phase and beginning the flight phase. Detected using loss of foot contact or vertical velocity threshold.

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Use Cases

  • Flight time calculation (takeoff to landing)
  • Takeoff velocity and jump height
  • Concentric phase duration (bottom to takeoff)