Track and Field: Discus

Overview

Events

MetricData TypeAcronymDescription
Peak BackswingIntPBthe peak backswing position prior to the throw
Dominant Foot OffIntDFOthe instance when the dominant foot leaves the ground
NonDominant Foot OffIntNDFOthe instance when the nondominant foot leaves the ground
Dominant Foot DownIntDFOthe instance when the dominant foot touches the ground
NonDominant Foot DownIntNDFOthe instance when the nondominant foot touches the ground
ReleaseIntRrelease of the discus

Phases and Stages of the Discus Throw

PhaseStartEnd
PreparationPBDFO
EntryDFONDFO
AirborneNDFODFD
TransitionDFDNDFD
DeliveryNDFDR

Discrete Metrics

MetricData TypeUnitsDescription
HandednessStringN/ACalculated handedness of the athlete (‘right’ or ‘left’)
Preparation PhaseFloatsecondsTime between peak backswing and dominant foot off
Entry PhaseFloatsecondsTime between dominant foot off and non-dominant foot off
Airborne PhaseFloatsecondsTime between non-dominant foot off and dominant foot down
Transition PhaseFloatsecondsTime between dominant foot down and non-dominant foot down
Delivery PhaseFloatsecondsTime between non-dominant foot down and release
Speed at DFOFloatm/sSpeed of the discus at dominant foot off
Speed at NDFOFloatm/sSpeed of the discus at non-dominant foot off
Speed at DFDFloatm/sSpeed of the discus at dominant foot down
Speed at NDFDFloatm/sSpeed of the discus at non-dominant foot down
Speed at ReleaseFloatm/sSpeed of the discus at release
Horizontal Release SpeedFloatm/sHorizontal component of discus speed at release
Vertical Release SpeedFloatm/sVertical component of discus speed at release
Hip-Shoulder Separation at DFOFloatdegreesTransverse angle between hips and shoulders at dominant foot off
Hip-Shoulder Separation at NDFOFloatdegreesTransverse angle between hips and shoulders at non-dominant foot off
Hip-Shoulder Separation at DFDFloatdegreesTransverse angle between hips and shoulders at dominant foot down
Hip-Shoulder Separation at NDFDFloatdegreesTransverse angle between hips and shoulders at non-dominant foot down
Hip-Shoulder Separation at ReleaseFloatdegreesTransverse angle between hips and shoulders at release
Arm Elevation Angle at DFOFloatdegreesAngle of throwing arm relative to horizontal at dominant foot off
Arm Elevation Angle at NDFOFloatdegreesAngle of throwing arm relative to horizontal at non-dominant foot off
Arm Elevation Angle at DFDFloatdegreesAngle of throwing arm relative to horizontal at dominant foot down
Arm Elevation Angle at NDFDFloatdegreesAngle of throwing arm relative to horizontal at non-dominant foot down
Arm Elevation Angle at ReleaseFloatdegreesAngle of throwing arm relative to horizontal at release
Shoulder-Arm Separation at DFOFloatdegreesAngle between shoulder line and arm at dominant foot off
Shoulder-Arm Separation at NDFOFloatdegreesAngle between shoulder line and arm at non-dominant foot off
Shoulder-Arm Separation at DFDFloatdegreesAngle between shoulder line and arm at dominant foot down
Shoulder-Arm Separation at NDFDFloatdegreesAngle between shoulder line and arm at non-dominant foot down
Shoulder-Arm Separation at ReleaseFloatdegreesAngle between shoulder line and arm at release
Base of Support WidthFloatmetersDistance between ankles at non-dominant foot down
Relative Release HeightFloatmetersVertical distance between discus and shoulder at release
Height at ReleaseFloatmetersAbsolute height of discus at release
Release AngleFloatdegreesAngle of discus trajectory at release
DistanceFloatmetersEstimated distance thrown
Trunk Flexion at ReleaseFloatdegreesTrunk sagittal flexion angle at release (forward = positive, backward = negative)
Release StyleStringN/AClassification of release style (‘Reverse’ or ‘Fixed Foot’)

Detailed Documentation

Events

::: upliftbiomch.events.throwing_events.DiscusEvents

Metrics

::: upliftbiomch.metrics.throwing_metrics.DiscusMetrics

Notes

  • All angular measurements follow ISB conventions
  • Kinematic data typically captured at 240Hz