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Overview

The single leg jump is a unilateral movement assessment that evaluates an athlete’s ability to generate power and maintain stability on one leg. This movement provides valuable information about lower extremity strength, balance, and neuromuscular control.

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Instructions

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Dimensions

Required inputs for processing:
  • Arm Position: [‘arm-swing’,‘hands-on-hips’]
  • Footedness: [‘left’,‘right’]

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Events

MetricDescriptionColumn Name
Initiationthe start of the jump - when the person begins to move downwawrdjump_initiation_frame
Bottomthe lowest point of the pelvis before the jumpbottom_of_jump_frame
Takeoffthe instant of leaving the groundtakeoff_frame
Peak Heightthe instant when maximum height reached“
Landingthe instant of ground contactjump_landing_frame
Landing Bottomthe lowest point of the pelvis after the jump“
Terminationend of the movement - when the person returns to normal standing position“

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Phases of the Jump

PhaseStartEnd
JumpingInitiationTakeoff
Jumping EccentricInitiationBottom
Jumping ConcentricBottomTakeoff
LandingLandingTermination
Landing EccentricLandingLanding Bottom
Landing ConcentricLanding BottomTermination

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Discrete Metrics

MetricUnitsDescriptionColumn Name
Jump HeightmetersMaximum height reached during the jumpjump_height
Flight TimesecondsTime from takeoff to landing“
Takeoff Velocitym/sVertical velocity at takeofftakeoff_velocity
RSI ModN/AReactive Strength Index Modifiedreactive_strength_index_modified
Right Valgus BottommetersRight knee valgus at bottom positionright_knee_valgus_at_bottom
Left Valgus BottommetersLeft knee valgus at bottom positionleft_knee_valgus_at_bottom
Right Valgus LandingmetersRight knee valgus at landingright_knee_valgus_at_landing
Left Valgus LandingmetersLeft knee valgus at landingleft_knee_valgus_at_landing
Right Valgus Landing BottommetersRight knee valgus at landing bottomright_knee_valgus_at_landing_bottom
Left Valgus Landing BottommetersLeft knee valgus at landing bottomleft_knee_valgus_at_landing_bottom
Right Valgus Landing FullmetersMaximum right knee valgus during landing“
Left Valgus Landing FullmetersMaximum left knee valgus during landing“
Right Eccentric Hip Knee DominanceratioRight hip-knee dominance during eccentric phase (0=hip dominant, 1=knee dominant)right_eccentric_hip_knee_dominance
Left Eccentric Hip Knee DominanceratioLeft hip-knee dominance during eccentric phase (0=hip dominant, 1=knee dominant)left_eccentric_hip_knee_dominance
Right Concentric Hip Knee DominanceratioRight hip-knee dominance during concentric phase (0=hip dominant, 1=knee dominant)right_concentric_hip_knee_dominance
Left Concentric Hip Knee DominanceratioLeft hip-knee dominance during concentric phase (0=hip dominant, 1=knee dominant)left_concentric_hip_knee_dominance
Landing Hip Knee DominanceratioHip-knee dominance during landing phase (0=hip dominant, 1=knee dominant)landing_hip_knee_dominance
Right DisplacementmetersLateral displacement during landing“
Forward DisplacementmetersForward displacement during landing“
Landing Stiffness IndexN/AIndex of landing stiffness“
Landing Stiffness Index LevelN/AClassification of landing stiffness“
Eccentric Velocitym/sAverage velocity during eccentric phase“
Knees TrackbinaryBinary indicator if knees track properly (1=yes, 0=no)“
Hips Feet StationarybinaryBinary indicator if hips and feet remain stationary“
High Jump HeightbinaryBinary indicator if jump height exceeds 14 inches“
Stiff Knee LandingbinaryBinary indicator of stiff knee landing“
Peak Hip Flexion TakeoffdegreesMaximum left hip flexion during takeoffjumping_hip_peak_flexion_angle
Peak Knee Flexion TakeoffdegreesMaximum right knee flexion during takeoffjumping_knee_peak_flexion_angle
Peak Ankle Flexion TakeoffdegreesMaximum right ankle flexion during takeoffjumping_ankle_peak_flexion_angle
Peak Hip Extension Velocity Takeoff Concentricdegrees/sMaximum left hip extension velocity during concentric phasejumping_hip_peak_extension_velocity
Peak Knee Extension Velocity Takeoff Concentricdegrees/sMaximum right knee extension velocity during concentric phasejumping_knee_peak_extension_velocity
Peak Ankle Extension Velocity Takeoff Concentricdegrees/sMaximum right ankle extension velocity during concentric phasejumping_ankle_peak_extension_velocity
Peak COM Velocity Takeoff Concentricm/sMaximum center of mass velocity during concentric phasejumping_com_peak_velocity
Peak Hip Flexion LandingdegreesMaximum left hip flexion during landinglanding_hip_peak_flexion_angle
Peak Knee Flexion LandingdegreesMaximum left knee flexion during landinglanding_knee_peak_flexion_angle
Peak Ankle Flexion LandingdegreesMaximum left ankle flexion during landinglanding_ankle_peak_flexion_angle
Peak Hip Flexion Velocity Landing Eccentricdegrees/sMaximum left hip flexion velocity during landing eccentric phaselanding_hip_peak_flexion_velocity
Peak Knee Flexion Velocity Landing Eccentricdegrees/sMaximum left knee flexion velocity during landing eccentric phaselanding_knee_peak_flexion_velocity
Peak Ankle Flexion Velocity Landing Eccentricdegrees/sMaximum left ankle flexion velocity during landing eccentric phaselanding_ankle_peak_flexion_velocity
Peak COM Velocity Landing Eccentricm/sMaximum center of mass velocity during landing eccentric phaselanding_com_peak_velocity
Kinematic SequenceN/ASequence of peak velocities during the jump“
Kinematic Sequence ArrayN/AArray representation of kinematic sequence“

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Notes

  • Kinematic data typically captured at 120Hz for Jumping