Overview
The drop vertical jump is a plyometric movement assessment that involves dropping from a platform and immediately performing a maximal vertical jump upon landing. This movement is commonly used in athletic assessment and training as it provides valuable information about reactive strength, neuromuscular coordination, and lower extremity function.Instructions
Step off the box or platform (do not jump off). Upon landing with both feet, immediately perform a maximal vertical jump. Land softly. Use the specified arm position (arm-swing or hands-on-hips) consistently for the trial.Dimensions
Required inputs for processing:- Arm Position: [‘arm-swing’,‘hands-on-hips’]
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 |
Output Variables
Generic Outputs
Every capture includes session metadata, standard joint angle/velocity time series, and 3D keypoint positions common to all movements. See Generic Outputs for the full list.Events
| Event | Description | Column Name |
|---|---|---|
| Initiation | the start of the jump - when the person begins to move downward | jump_initiation_frame |
| Bottom | the lowest point of the pelvis before the jump | bottom_of_jump_frame |
| Takeoff | the instant of leaving the ground | takeoff_frame |
| Peak Height | the instant when maximum height reached | “ |
| Landing | the instant of ground contact | jump_landing_frame |
| Landing Bottom | the lowest point of the pelvis after the jump | “ |
| Termination | end of the movement - when the person returns to normal standing position | “ |
Distance Metrics
| Metric | Units | Description | Column Name |
|---|---|---|---|
| Jump Height | meters | Maximum height reached during the jump | jump_height |
| Right Valgus Bottom | meters | Right knee valgus at bottom position | right_knee_valgus_at_bottom |
| Left Valgus Bottom | meters | Left knee valgus at bottom position | left_knee_valgus_at_bottom |
| Right Valgus Landing | meters | Right knee valgus at landing | right_knee_valgus_at_landing |
| Left Valgus Landing | meters | Left knee valgus at landing | left_knee_valgus_at_landing |
| Right Valgus Landing Bottom | meters | Right knee valgus at landing bottom | right_knee_valgus_at_landing_bottom |
| Left Valgus Landing Bottom | meters | Left knee valgus at landing bottom | left_knee_valgus_at_landing_bottom |
| Right Valgus Landing Full | meters | Maximum right knee valgus during landing | “ |
| Left Valgus Landing Full | meters | Maximum left knee valgus during landing | “ |
| Right Displacement | meters | Lateral displacement during landing | “ |
| Forward Displacement | meters | Forward displacement during landing | “ |
Movement Flags and Other Metrics
| Metric | Units | Description | Column Name |
|---|---|---|---|
| Knees Track | binary | Binary indicator if knees track properly (1=yes, 0=no) | “ |
| Hips Feet Stationary | binary | Binary indicator if hips and feet remain stationary | “ |
| High Jump Height | binary | Binary indicator if jump height exceeds 14 inches | “ |
| Stiff Knee Landing | binary | Binary indicator of stiff knee landing | “ |
| Flight Time | seconds | Time from takeoff to landing | “ |
| RSI Mod | N/A | Reactive Strength Index Modified | reactive_strength_index_modified |
| Eccentric Hip Knee Dominance | ratio | Hip-knee dominance during eccentric phase (0=hip dominant, 1=knee dominant) | eccentric_hip_knee_dominance |
| Concentric Hip Knee Dominance | ratio | Hip-knee dominance during concentric phase (0=hip dominant, 1=knee dominant) | concentric_hip_knee_dominance |
| Landing Hip Knee Dominance | ratio | Hip-knee dominance during landing phase (0=hip dominant, 1=knee dominant) | landing_hip_knee_dominance |
| Landing Stiffness Index | N/A | Index of landing stiffness | “ |
| Landing Stiffness Index Level | N/A | Classification of landing stiffness | “ |
| Eccentric Velocity | m/s | Average velocity during eccentric phase | “ |
| Kinematic Sequence | N/A | Sequence of peak velocities during the jump | “ |
| Kinematic Sequence Array | N/A | Array representation of kinematic sequence | “ |
Joint Angles
| Metric | Units | Description | Column Name |
|---|---|---|---|
| Left Peak Hip Flexion Takeoff | degrees | Maximum left hip flexion during takeoff | jumping_left_hip_peak_flexion_angle |
| Right Peak Hip Flexion Takeoff | degrees | Maximum right hip flexion during takeoff | jumping_right_hip_peak_flexion_angle |
| Left Peak Knee Flexion Takeoff | degrees | Maximum left knee flexion during takeoff | jumping_left_knee_peak_flexion_angle |
| Right Peak Knee Flexion Takeoff | degrees | Maximum right knee flexion during takeoff | jumping_right_knee_peak_flexion_angle |
| Left Peak Ankle Flexion Takeoff | degrees | Maximum left ankle flexion during takeoff | jumping_left_ankle_peak_flexion_angle |
| Right Peak Ankle Flexion Takeoff | degrees | Maximum right ankle flexion during takeoff | jumping_right_ankle_peak_flexion_angle |
| Left Peak Hip Flexion Landing | degrees | Maximum left hip flexion during landing | landing_left_hip_peak_flexion_angle |
| Right Peak Hip Flexion Landing | degrees | Maximum right hip flexion during landing | landing_right_hip_peak_flexion_angle |
| Left Peak Knee Flexion Landing | degrees | Maximum left knee flexion during landing | landing_left_knee_peak_flexion_angle |
| Right Peak Knee Flexion Landing | degrees | Maximum right knee flexion during landing | landing_right_knee_peak_flexion_angle |
| Left Peak Ankle Flexion Landing | degrees | Maximum left ankle flexion during landing | landing_left_ankle_peak_flexion_angle |
| Right Peak Ankle Flexion Landing | degrees | Maximum right ankle flexion during landing | landing_right_ankle_peak_flexion_angle |
Joint Velocities
| Metric | Units | Description | Column Name |
|---|---|---|---|
| Left Peak Hip Flexion Velocity Takeoff Eccentric | degrees/s | Maximum left hip flexion velocity during eccentric phase | “ |
| Right Peak Hip Flexion Velocity Takeoff Eccentric | degrees/s | Maximum right hip flexion velocity during eccentric phase | “ |
| Left Peak Knee Flexion Velocity Takeoff Eccentric | degrees/s | Maximum left knee flexion velocity during eccentric phase | “ |
| Right Peak Knee Flexion Velocity Takeoff Eccentric | degrees/s | Maximum right knee flexion velocity during eccentric phase | “ |
| Left Peak Ankle Flexion Velocity Takeoff Eccentric | degrees/s | Maximum left ankle flexion velocity during eccentric phase | “ |
| Right Peak Ankle Flexion Velocity Takeoff Eccentric | degrees/s | Maximum right ankle flexion velocity during eccentric phase | “ |
| Left Peak Shoulder Flexion Velocity Takeoff Concentric | degrees/s | Maximum left shoulder flexion velocity during concentric phase | “ |
| Right Peak Shoulder Flexion Velocity Takeoff Concentric | degrees/s | Maximum right shoulder flexion velocity during concentric phase | “ |
| Left Peak Hip Extension Velocity Takeoff Concentric | degrees/s | Maximum left hip extension velocity during concentric phase | jumping_left_hip_peak_extension_velocity |
| Right Peak Hip Extension Velocity Takeoff Concentric | degrees/s | Maximum right hip extension velocity during concentric phase | jumping_right_hip_peak_extension_velocity |
| Left Peak Knee Extension Velocity Takeoff Concentric | degrees/s | Maximum left knee extension velocity during concentric phase | jumping_left_knee_peak_extension_velocity |
| Right Peak Knee Extension Velocity Takeoff Concentric | degrees/s | Maximum right knee extension velocity during concentric phase | jumping_right_knee_peak_extension_velocity |
| Left Peak Ankle Extension Velocity Takeoff Concentric | degrees/s | Maximum left ankle extension velocity during concentric phase | jumping_left_ankle_peak_extension_velocity |
| Right Peak Ankle Extension Velocity Takeoff Concentric | degrees/s | Maximum right ankle extension velocity during concentric phase | jumping_right_ankle_peak_extension_velocity |
| Left Peak Hip Flexion Velocity Landing Eccentric | degrees/s | Maximum left hip flexion velocity during landing eccentric phase | landing_left_hip_peak_flexion_velocity |
| Right Peak Hip Flexion Velocity Landing Eccentric | degrees/s | Maximum right hip flexion velocity during landing eccentric phase | landing_right_hip_peak_flexion_velocity |
| Left Peak Knee Flexion Velocity Landing Eccentric | degrees/s | Maximum left knee flexion velocity during landing eccentric phase | landing_left_knee_peak_flexion_velocity |
| Right Peak Knee Flexion Velocity Landing Eccentric | degrees/s | Maximum right knee flexion velocity during landing eccentric phase | landing_right_knee_peak_flexion_velocity |
| Left Peak Ankle Flexion Velocity Landing Eccentric | degrees/s | Maximum left ankle flexion velocity during landing eccentric phase | landing_left_ankle_peak_flexion_velocity |
| Right Peak Ankle Flexion Velocity Landing Eccentric | degrees/s | Maximum right ankle flexion velocity during landing eccentric phase | landing_right_ankle_peak_flexion_velocity |
| Peak COM Velocity Landing Eccentric | m/s | Maximum center of mass velocity during landing eccentric phase | landing_com_peak_velocity |
| Left Peak Hip Extension Velocity Landing Concentric | degrees/s | Maximum left hip extension velocity during landing concentric phase | “ |
| Right Peak Hip Extension Velocity Landing Concentric | degrees/s | Maximum right hip extension velocity during landing concentric phase | “ |
| Left Peak Knee Extension Velocity Landing Concentric | degrees/s | Maximum left knee extension velocity during landing concentric phase | “ |
| Right Peak Knee Extension Velocity Landing Concentric | degrees/s | Maximum right knee extension velocity during landing concentric phase | “ |
| Left Peak Ankle Extension Velocity Landing Concentric | degrees/s | Maximum left ankle extension velocity during landing concentric phase | “ |
| Right Peak Ankle Extension Velocity Landing Concentric | degrees/s | Maximum right ankle extension velocity during landing concentric phase | “ |
Linear Velocities
| Metric | Units | Description | Column Name |
|---|---|---|---|
| Takeoff Velocity | m/s | Vertical velocity at takeoff | takeoff_velocity |
| Peak COM Velocity Takeoff Eccentric | m/s | Maximum center of mass velocity during eccentric phase | “ |
| Peak COM Velocity Takeoff Concentric | m/s | Maximum center of mass velocity during concentric phase | jumping_com_peak_velocity |
| Peak COM Velocity Landing Eccentric | m/s | Maximum center of mass velocity during landing eccentric phase | landing_com_peak_velocity |
| Peak COM Velocity Landing Concentric | m/s | Maximum center of mass velocity during landing concentric phase | “ |
Notes
- Kinematic data typically captured at 120Hz for Jumping