> ## Documentation Index > Fetch the complete documentation index at: https://docs.uplift.ai/llms.txt > Use this file to discover all available pages before exploring further. # Drop Vertical Jump > Biomechanical analysis of drop vertical jump movements, including events, phases, and discrete metrics. ## 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 ### Events | Event | Description | Column Name | | --------------------------------------------------------------------- | ------------------------------------------------------------------------- | ----------------------- | | [Initiation](/biomechanics/activities/jump/events/initiation) | the start of the jump - when the person begins to move downward | `jump_initiation_frame` | | [Bottom](/biomechanics/activities/jump/events/bottom) | the lowest point of the pelvis before the jump | `bottom_of_jump_frame` | | [Takeoff](/biomechanics/activities/jump/events/takeoff) | the instant of leaving the ground | `takeoff_frame` | | [Peak Height](/biomechanics/activities/jump/events/peak-height) | the instant when maximum height reached | \`\` | | [Landing](/biomechanics/activities/jump/events/landing) | the instant of ground contact | `jump_landing_frame` | | [Landing Bottom](/biomechanics/activities/jump/events/landing-bottom) | the lowest point of the pelvis after the jump | \`\` | | [Termination](/biomechanics/activities/jump/events/termination) | end of the movement - when the person returns to normal standing position | \`\` | ### Distance Metrics | Metric | Units | Description | Column Name | | ---------------------------------------------------------------------------------- | ------ | ---------------------------------------- | ------------------------------------- | | [Jump Height](/biomechanics/activities/jump/metrics/jump-height) | meters | Maximum height reached during the jump | `jump_height` | | [Right Valgus Bottom](/biomechanics/activities/jump/metrics/knee-valgus) | meters | Right knee valgus at bottom position | `right_knee_valgus_at_bottom` | | [Left Valgus Bottom](/biomechanics/activities/jump/metrics/knee-valgus) | meters | Left knee valgus at bottom position | `left_knee_valgus_at_bottom` | | [Right Valgus Landing](/biomechanics/activities/jump/metrics/knee-valgus) | meters | Right knee valgus at landing | `right_knee_valgus_at_landing` | | [Left Valgus Landing](/biomechanics/activities/jump/metrics/knee-valgus) | meters | Left knee valgus at landing | `left_knee_valgus_at_landing` | | [Right Valgus Landing Bottom](/biomechanics/activities/jump/metrics/knee-valgus) | meters | Right knee valgus at landing bottom | `right_knee_valgus_at_landing_bottom` | | [Left Valgus Landing Bottom](/biomechanics/activities/jump/metrics/knee-valgus) | meters | Left knee valgus at landing bottom | `left_knee_valgus_at_landing_bottom` | | [Right Valgus Landing Full](/biomechanics/activities/jump/metrics/knee-valgus) | meters | Maximum right knee valgus during landing | \`\` | | [Left Valgus Landing Full](/biomechanics/activities/jump/metrics/knee-valgus) | meters | Maximum left knee valgus during landing | \`\` | | [Right Displacement](/biomechanics/activities/jump/metrics/right-displacement) | meters | Lateral displacement during landing | \`\` | | [Forward Displacement](/biomechanics/activities/jump/metrics/forward-displacement) | meters | Forward displacement during landing | \`\` | ### Movement Flags and Other Metrics | Metric | Units | Description | Column Name | | ---------------------------------------------------------------------------------------------------- | ------- | ---------------------------------------------------------------------------- | ---------------------------------- | | [Knees Track](/biomechanics/activities/jump/metrics/knees-track) | binary | Binary indicator if knees track properly (1=yes, 0=no) | \`\` | | [Hips Feet Stationary](/biomechanics/activities/jump/metrics/hips-feet-stationary) | binary | Binary indicator if hips and feet remain stationary | \`\` | | [High Jump Height](/biomechanics/activities/jump/metrics/high-jump-height) | binary | Binary indicator if jump height exceeds 14 inches | \`\` | | [Stiff Knee Landing](/biomechanics/activities/jump/metrics/stiff-knee-landing) | binary | Binary indicator of stiff knee landing | \`\` | | [Flight Time](/biomechanics/activities/jump/metrics/flight-time) | seconds | Time from takeoff to landing | \`\` | | [RSI Mod](/biomechanics/activities/jump/metrics/reactive-strength-index-modified) | N/A | Reactive Strength Index Modified | `reactive_strength_index_modified` | | [Eccentric Hip Knee Dominance](/biomechanics/activities/jump/metrics/hip-knee-dominance) | ratio | Hip-knee dominance during eccentric phase (0=hip dominant, 1=knee dominant) | `eccentric_hip_knee_dominance` | | [Concentric Hip Knee Dominance](/biomechanics/activities/jump/metrics/hip-knee-dominance) | ratio | Hip-knee dominance during concentric phase (0=hip dominant, 1=knee dominant) | `concentric_hip_knee_dominance` | | [Landing Hip Knee Dominance](/biomechanics/activities/jump/metrics/hip-knee-dominance) | ratio | Hip-knee dominance during landing phase (0=hip dominant, 1=knee dominant) | `landing_hip_knee_dominance` | | [Landing Stiffness Index](/biomechanics/activities/jump/metrics/landing-stiffness-index) | N/A | Index of landing stiffness | \`\` | | [Landing Stiffness Index Level](/biomechanics/activities/jump/metrics/landing-stiffness-index-level) | N/A | Classification of landing stiffness | \`\` | | [Eccentric Velocity](/biomechanics/activities/jump/metrics/eccentric-velocity) | m/s | Average velocity during eccentric phase | \`\` | | [Kinematic Sequence](/biomechanics/activities/jump/metrics/kinematic-sequence) | N/A | Sequence of peak velocities during the jump | \`\` | | [Kinematic Sequence Array](/biomechanics/activities/jump/metrics/kinematic-sequence-array) | N/A | Array representation of kinematic sequence | \`\` | ### Joint Angles | Metric | Units | Description | Column Name | | ------------------------------------------------------------------------------------------ | ------- | ------------------------------------------ | ---------------------------------------- | | [Left Peak Hip Flexion Takeoff](/biomechanics/activities/jump/metrics/peak-hip-angle) | degrees | Maximum left hip flexion during takeoff | `jumping_left_hip_peak_flexion_angle` | | [Right Peak Hip Flexion Takeoff](/biomechanics/activities/jump/metrics/peak-hip-angle) | degrees | Maximum right hip flexion during takeoff | `jumping_right_hip_peak_flexion_angle` | | [Left Peak Knee Flexion Takeoff](/biomechanics/activities/jump/metrics/peak-knee-angle) | degrees | Maximum left knee flexion during takeoff | `jumping_left_knee_peak_flexion_angle` | | [Right Peak Knee Flexion Takeoff](/biomechanics/activities/jump/metrics/peak-knee-angle) | degrees | Maximum right knee flexion during takeoff | `jumping_right_knee_peak_flexion_angle` | | [Left Peak Ankle Flexion Takeoff](/biomechanics/activities/jump/metrics/peak-ankle-angle) | degrees | Maximum left ankle flexion during takeoff | `jumping_left_ankle_peak_flexion_angle` | | [Right Peak Ankle Flexion Takeoff](/biomechanics/activities/jump/metrics/peak-ankle-angle) | degrees | Maximum right ankle flexion during takeoff | `jumping_right_ankle_peak_flexion_angle` | | [Left Peak Hip Flexion Landing](/biomechanics/activities/jump/metrics/peak-hip-angle) | degrees | Maximum left hip flexion during landing | `landing_left_hip_peak_flexion_angle` | | [Right Peak Hip Flexion Landing](/biomechanics/activities/jump/metrics/peak-hip-angle) | degrees | Maximum right hip flexion during landing | `landing_right_hip_peak_flexion_angle` | | [Left Peak Knee Flexion Landing](/biomechanics/activities/jump/metrics/peak-knee-angle) | degrees | Maximum left knee flexion during landing | `landing_left_knee_peak_flexion_angle` | | [Right Peak Knee Flexion Landing](/biomechanics/activities/jump/metrics/peak-knee-angle) | degrees | Maximum right knee flexion during landing | `landing_right_knee_peak_flexion_angle` | | [Left Peak Ankle Flexion Landing](/biomechanics/activities/jump/metrics/peak-ankle-angle) | degrees | Maximum left ankle flexion during landing | `landing_left_ankle_peak_flexion_angle` | | [Right Peak Ankle Flexion Landing](/biomechanics/activities/jump/metrics/peak-ankle-angle) | 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](/biomechanics/activities/jump/metrics/peak-hip-velocity) | degrees/s | Maximum left hip flexion velocity during eccentric phase | \`\` | | [Right Peak Hip Flexion Velocity Takeoff Eccentric](/biomechanics/activities/jump/metrics/peak-hip-velocity) | degrees/s | Maximum right hip flexion velocity during eccentric phase | \`\` | | [Left Peak Knee Flexion Velocity Takeoff Eccentric](/biomechanics/activities/jump/metrics/peak-knee-velocity) | degrees/s | Maximum left knee flexion velocity during eccentric phase | \`\` | | [Right Peak Knee Flexion Velocity Takeoff Eccentric](/biomechanics/activities/jump/metrics/peak-knee-velocity) | degrees/s | Maximum right knee flexion velocity during eccentric phase | \`\` | | [Left Peak Ankle Flexion Velocity Takeoff Eccentric](/biomechanics/activities/jump/metrics/peak-ankle-velocity) | degrees/s | Maximum left ankle flexion velocity during eccentric phase | \`\` | | [Right Peak Ankle Flexion Velocity Takeoff Eccentric](/biomechanics/activities/jump/metrics/peak-ankle-velocity) | degrees/s | Maximum right ankle flexion velocity during eccentric phase | \`\` | | [Left Peak Shoulder Flexion Velocity Takeoff Concentric](/biomechanics/activities/jump/metrics/peak-shoulder-flexion-velocity-takeoff-concentric) | degrees/s | Maximum left shoulder flexion velocity during concentric phase | \`\` | | [Right Peak Shoulder Flexion Velocity Takeoff Concentric](/biomechanics/activities/jump/metrics/peak-shoulder-flexion-velocity-takeoff-concentric) | degrees/s | Maximum right shoulder flexion velocity during concentric phase | \`\` | | [Left Peak Hip Extension Velocity Takeoff Concentric](/biomechanics/activities/jump/metrics/peak-hip-velocity) | degrees/s | Maximum left hip extension velocity during concentric phase | `jumping_left_hip_peak_extension_velocity` | | [Right Peak Hip Extension Velocity Takeoff Concentric](/biomechanics/activities/jump/metrics/peak-hip-velocity) | degrees/s | Maximum right hip extension velocity during concentric phase | `jumping_right_hip_peak_extension_velocity` | | [Left Peak Knee Extension Velocity Takeoff Concentric](/biomechanics/activities/jump/metrics/peak-knee-velocity) | degrees/s | Maximum left knee extension velocity during concentric phase | `jumping_left_knee_peak_extension_velocity` | | [Right Peak Knee Extension Velocity Takeoff Concentric](/biomechanics/activities/jump/metrics/peak-knee-velocity) | degrees/s | Maximum right knee extension velocity during concentric phase | `jumping_right_knee_peak_extension_velocity` | | [Left Peak Ankle Extension Velocity Takeoff Concentric](/biomechanics/activities/jump/metrics/peak-ankle-velocity) | degrees/s | Maximum left ankle extension velocity during concentric phase | `jumping_left_ankle_peak_extension_velocity` | | [Right Peak Ankle Extension Velocity Takeoff Concentric](/biomechanics/activities/jump/metrics/peak-ankle-velocity) | degrees/s | Maximum right ankle extension velocity during concentric phase | `jumping_right_ankle_peak_extension_velocity` | | [Left Peak Hip Flexion Velocity Landing Eccentric](/biomechanics/activities/jump/metrics/peak-hip-velocity) | degrees/s | Maximum left hip flexion velocity during landing eccentric phase | `landing_left_hip_peak_flexion_velocity` | | [Right Peak Hip Flexion Velocity Landing Eccentric](/biomechanics/activities/jump/metrics/peak-hip-velocity) | degrees/s | Maximum right hip flexion velocity during landing eccentric phase | `landing_right_hip_peak_flexion_velocity` | | [Left Peak Knee Flexion Velocity Landing Eccentric](/biomechanics/activities/jump/metrics/peak-knee-velocity) | degrees/s | Maximum left knee flexion velocity during landing eccentric phase | `landing_left_knee_peak_flexion_velocity` | | [Right Peak Knee Flexion Velocity Landing Eccentric](/biomechanics/activities/jump/metrics/peak-knee-velocity) | degrees/s | Maximum right knee flexion velocity during landing eccentric phase | `landing_right_knee_peak_flexion_velocity` | | [Left Peak Ankle Flexion Velocity Landing Eccentric](/biomechanics/activities/jump/metrics/peak-ankle-velocity) | degrees/s | Maximum left ankle flexion velocity during landing eccentric phase | `landing_left_ankle_peak_flexion_velocity` | | [Right Peak Ankle Flexion Velocity Landing Eccentric](/biomechanics/activities/jump/metrics/peak-ankle-velocity) | degrees/s | Maximum right ankle flexion velocity during landing eccentric phase | `landing_right_ankle_peak_flexion_velocity` | | [Peak COM Velocity Landing Eccentric](/biomechanics/activities/jump/metrics/peak-com-velocity) | m/s | Maximum center of mass velocity during landing eccentric phase | `landing_com_peak_velocity` | | [Left Peak Hip Extension Velocity Landing Concentric](/biomechanics/activities/jump/metrics/peak-hip-velocity) | degrees/s | Maximum left hip extension velocity during landing concentric phase | \`\` | | [Right Peak Hip Extension Velocity Landing Concentric](/biomechanics/activities/jump/metrics/peak-hip-velocity) | degrees/s | Maximum right hip extension velocity during landing concentric phase | \`\` | | [Left Peak Knee Extension Velocity Landing Concentric](/biomechanics/activities/jump/metrics/peak-knee-velocity) | degrees/s | Maximum left knee extension velocity during landing concentric phase | \`\` | | [Right Peak Knee Extension Velocity Landing Concentric](/biomechanics/activities/jump/metrics/peak-knee-velocity) | degrees/s | Maximum right knee extension velocity during landing concentric phase | \`\` | | [Left Peak Ankle Extension Velocity Landing Concentric](/biomechanics/activities/jump/metrics/peak-ankle-velocity) | degrees/s | Maximum left ankle extension velocity during landing concentric phase | \`\` | | [Right Peak Ankle Extension Velocity Landing Concentric](/biomechanics/activities/jump/metrics/peak-ankle-velocity) | degrees/s | Maximum right ankle extension velocity during landing concentric phase | \`\` | ### Linear Velocities | Metric | Units | Description | Column Name | | ----------------------------------------------------------------------------------------------- | ----- | --------------------------------------------------------------- | --------------------------- | | [Takeoff Velocity](/biomechanics/activities/jump/metrics/takeoff-velocity) | m/s | Vertical velocity at takeoff | `takeoff_velocity` | | [Peak COM Velocity Takeoff Eccentric](/biomechanics/activities/jump/metrics/peak-com-velocity) | m/s | Maximum center of mass velocity during eccentric phase | \`\` | | [Peak COM Velocity Takeoff Concentric](/biomechanics/activities/jump/metrics/peak-com-velocity) | m/s | Maximum center of mass velocity during concentric phase | `jumping_com_peak_velocity` | | [Peak COM Velocity Landing Eccentric](/biomechanics/activities/jump/metrics/peak-com-velocity) | m/s | Maximum center of mass velocity during landing eccentric phase | `landing_com_peak_velocity` | | [Peak COM Velocity Landing Concentric](/biomechanics/activities/jump/metrics/peak-com-velocity) | m/s | Maximum center of mass velocity during landing concentric phase | \`\` | ## Notes * Kinematic data typically captured at 120Hz for Jumping