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Technical Details

  • Variable Type: Event
  • Data Type: Integer
  • Units: Frame number
  • Column Name: lunge_forward_initiation_frame
  • Required for QA: True
  • Measurement: Frame at which the lunge movement begins, detected as the left interpolated base of the pelvis vertical trajectory peak

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Description

Initiation marks the start of the forward lunge when the athlete begins to step forward and descend. It is detected from the pelvis vertical position waveform as the interpolated left boundary (left_ips) of the peak prominence, and separates the preparation phase from the loading (descent) phase.

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Use Cases

  • Lunge phase timing and duration
  • Eccentric phase definition (Initiation to Bottom)
  • Total rep duration