Single Leg Jump

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.

Instructions

Dimensions

Required inputs for processing:

Arm Position: [‘arm-swing’,‘hands-on-hips’]
Footedness: [‘left’,‘right’]

Events

Metric	Data Type	Description	Column Name
Initiation	Int	the start of the jump - when the person begins to move downwawrd	`jump_initiation_frame`
Bottom	Int	the lowest point of the pelvis before the jump	`bottom_of_jump_frame`
Takeoff	Int	the instant of leaving the ground	`takeoff_frame`
Peak Height	Int	the instant when maximum height reached	“
Landing	Int	the instant of ground contact	`jump_landing_frame`
Landing Bottom	Int	the lowest point of the pelvis after the jump	“
Termination	Int	end of the movement - when the person returns to normal standing position	“

Phases of the Jump

Phase	Start	End
Jumping	Initiation	Takeoff
Jumping Eccentric	Initiation	Bottom
Jumping Concentric	Bottom	Takeoff
Landing	Landing	Termination
Landing Eccentric	Landing	Landing Bottom
Landing Concentric	Landing Bottom	Termination

Discrete Metrics

Metric	Data Type	Units	Description	Column Name
Jump Height	Float	meters	Maximum height reached during the jump	`jump_height`
Flight Time	Float	seconds	Time from takeoff to landing	“
Takeoff Velocity	Float	m/s	Vertical velocity at takeoff	`takeoff_velocity`
RSI Mod	Float	N/A	Reactive Strength Index Modified	`reactive_strength_index_modified`
Right Valgus Bottom	Float	meters	Right knee valgus at bottom position	`right_knee_valgus_at_bottom`
Left Valgus Bottom	Float	meters	Left knee valgus at bottom position	`left_knee_valgus_at_bottom`
Right Valgus Landing	Float	meters	Right knee valgus at landing	`right_knee_valgus_at_landing`
Left Valgus Landing	Float	meters	Left knee valgus at landing	`left_knee_valgus_at_landing`
Right Valgus Landing Bottom	Float	meters	Right knee valgus at landing bottom	`right_knee_valgus_at_landing_bottom`
Left Valgus Landing Bottom	Float	meters	Left knee valgus at landing bottom	`left_knee_valgus_at_landing_bottom`
Right Valgus Landing Full	Float	meters	Maximum right knee valgus during landing	“
Left Valgus Landing Full	Float	meters	Maximum left knee valgus during landing	“
Right Eccentric Hip Knee Dominance	Float	ratio	Right hip-knee dominance during eccentric phase (0=hip dominant, 1=knee dominant)	`right_eccentric_hip_knee_dominance`
Left Eccentric Hip Knee Dominance	Float	ratio	Left hip-knee dominance during eccentric phase (0=hip dominant, 1=knee dominant)	`left_eccentric_hip_knee_dominance`
Right Concentric Hip Knee Dominance	Float	ratio	Right hip-knee dominance during concentric phase (0=hip dominant, 1=knee dominant)	`right_concentric_hip_knee_dominance`
Left Concentric Hip Knee Dominance	Float	ratio	Left hip-knee dominance during concentric phase (0=hip dominant, 1=knee dominant)	`left_concentric_hip_knee_dominance`
Landing Hip Knee Dominance	Float	ratio	Hip-knee dominance during landing phase (0=hip dominant, 1=knee dominant)	`landing_hip_knee_dominance`
Right Displacement	Float	meters	Lateral displacement during landing	“
Forward Displacement	Float	meters	Forward displacement during landing	“
Landing Stiffness Index	Float	N/A	Index of landing stiffness	“
Landing Stiffness Index Level	String	N/A	Classification of landing stiffness	“
Eccentric Velocity	Float	m/s	Average velocity during eccentric phase	“
Knees Track	Int	binary	Binary indicator if knees track properly (1=yes, 0=no)	“
Hips Feet Stationary	Int	binary	Binary indicator if hips and feet remain stationary	“
High Jump Height	Int	binary	Binary indicator if jump height exceeds 14 inches	“
Stiff Knee Landing	Int	binary	Binary indicator of stiff knee landing	“
Peak Hip Flexion Takeoff	Float	degrees	Maximum left hip flexion during takeoff	`jumping_hip_peak_flexion_angle`
Peak Knee Flexion Takeoff	Float	degrees	Maximum right knee flexion during takeoff	`jumping_knee_peak_flexion_angle`
Peak Ankle Flexion Takeoff	Float	degrees	Maximum right ankle flexion during takeoff	`jumping_ankle_peak_flexion_angle`
Peak Hip Extension Velocity Takeoff Concentric	Float	degrees/s	Maximum left hip extension velocity during concentric phase	`jumping_hip_peak_extension_velocity`
Peak Knee Extension Velocity Takeoff Concentric	Float	degrees/s	Maximum right knee extension velocity during concentric phase	`jumping_knee_peak_extension_velocity`
Peak Ankle Extension Velocity Takeoff Concentric	Float	degrees/s	Maximum right ankle extension velocity during concentric phase	`jumping_ankle_peak_extension_velocity`
Peak COM Velocity Takeoff Concentric	Float	m/s	Maximum center of mass velocity during concentric phase	`jumping_com_peak_velocity`
Peak Hip Flexion Landing	Float	degrees	Maximum left hip flexion during landing	`landing_hip_peak_flexion_angle`
Peak Knee Flexion Landing	Float	degrees	Maximum left knee flexion during landing	`landing_knee_peak_flexion_angle`
Peak Ankle Flexion Landing	Float	degrees	Maximum left ankle flexion during landing	`landing_ankle_peak_flexion_angle`
Peak Hip Flexion Velocity Landing Eccentric	Float	degrees/s	Maximum left hip flexion velocity during landing eccentric phase	`landing_hip_peak_flexion_velocity`
Peak Knee Flexion Velocity Landing Eccentric	Float	degrees/s	Maximum left knee flexion velocity during landing eccentric phase	`landing_knee_peak_flexion_velocity`
Peak Ankle Flexion Velocity Landing Eccentric	Float	degrees/s	Maximum left ankle flexion velocity during landing eccentric phase	`landing_ankle_peak_flexion_velocity`
Peak COM Velocity Landing Eccentric	Float	m/s	Maximum center of mass velocity during landing eccentric phase	`landing_com_peak_velocity`
Kinematic Sequence	String	N/A	Sequence of peak velocities during the jump	“
Kinematic Sequence Array	Array	N/A	Array representation of kinematic sequence	“

Notes

Kinematic data typically captured at 120Hz for Jumping

Get Started

Resources

Biomechanics

Single Leg Jump

Overview

Instructions

Dimensions

Events

Phases of the Jump

Discrete Metrics

Notes

Get Started

Resources

Biomechanics

​Overview

​Instructions

​Dimensions

​Events

​Phases of the Jump

​Discrete Metrics

​Notes

Overview

Instructions

Dimensions

Events

Phases of the Jump

Discrete Metrics

Notes