What we measure
CC Athletics - Metric overview
Jump Performance Primary outcome measures of jump performance
Jump Height by Flight Time (FT)
Jump Height by Net Impulse (NI)
The velocity at takeoff
Flight Time / Contact Time (DJ). (Time-to-Takeoff for CMJ/SJ)
Jump Height / Contact Time (DJ). (Time-to-Takeoff (CMJ/SJ). Uses Net Impulse when available.
The momentum generated during the jump, calculated as the product of body mass and takeoff velocity.
Maximum depth of the countermovement phase, representing how far the center of mass descends before the propulsive phase begins.
Impulse Metrics Impulse metrics during braking and propulsive phases
The total impulse (bodyweight subtracted) applied during the braking+propulsive phase
Net impulse over the full eccentric phase (unweighting + braking combined). Because the athlete starts and ends this phase at rest, the two sub-phases largely cancel — values near zero are normal.
Net impulse (force minus bodyweight) generated during the propulsive phase (from lowest position to takeoff). Represents the force-time integral that accelerates the body upward. Equivalent to 'Concentric Impulse' in some other systems.
Net impulse during the propulsive phase relative to body mass
Net impulse (force minus bodyweight) generated during the braking/deceleration phase only (from Eccentric Peak Velocity to lowest position). Quantifies how effectively the athlete decelerates after reaching maximum downward velocity. Note: For the full eccentric phase impulse (including unweighting), see 'Eccentric Impulse'.
Force Metrics Force measurements during various phases and conditions
The peak instantaneous force during the entire jump
The minimum force measured during the unweighting phase
Relative min unweighting weight. The minimum force during unweighting expressed as a multiple of body weight
The peak instantaneous force during the braking/deceleration phase only (from Eccentric Peak Velocity to lowest position). For full eccentric phase metrics, see 'Peak Eccentric Force'.
The average force during the braking/deceleration phase only (from Eccentric Peak Velocity to lowest position). For full eccentric phase metrics, see 'Avg Eccentric Force'.
The average force during the full eccentric phase (unweighting + braking combined). This represents the mean force from movement initiation to the lowest point of the countermovement.
The peak instantaneous force during the full eccentric phase (unweighting + braking combined). This represents the maximum force from movement initiation to the lowest point of the countermovement.
The average force during the propulsive phase
Average force during the propulsive phase relative to body mass
The peak instantaneous force during the propulsive phase
Peak force output expressed as multiples of body weight
The instantaneous force at peak power (of entire dataset)
The total force (ground reaction force) measured at the point of maximum displacement depth during the countermovement. This represents the force applied when the athlete reaches the bottom of their countermovement.
Relative force @min displacement. The force at minimum displacement expressed as a multiple of body weight.
Power Power output throughout the jump
The peak instantaneous power during the braking/deceleration phase only (negative value). For full eccentric phase metrics as absolute value, see 'Peak Eccentric Power'.
The average mechanical power during the braking/deceleration phase only (negative value). For full eccentric phase metrics as absolute value, see 'Avg Eccentric Power'.
The total work done during the braking/deceleration phase only (negative value). For full eccentric phase metrics as absolute value, see 'Eccentric Work'.
The peak instantaneous power during the full eccentric phase (unweighting + braking combined). Reported as absolute value. High values indicate strong eccentric power capacity.
The average mechanical power during the full eccentric phase (unweighting + braking combined). Reported as absolute value. Represents the mean rate of energy absorption during the downward phase.
The total work done during the full eccentric phase (unweighting + braking combined). Reported as absolute value. Quantifies total energy absorbed from movement initiation to lowest position.
The maximum power output during the propulsive phase
The average power output during the propulsive phase
The total work done during the propulsive phase
The peak instantaneous power during the entire jump
Peak power output expressed as watts per kilogram of body weight
Velocity Velocity throughout the jump
The minimum velocity during the braking phase
The average velocity during the braking phase
The minimum (most negative) velocity during the full eccentric phase. This represents the peak downward velocity, also known as Eccentric Peak Velocity (EPV), which marks the transition from unweighting to braking.
The average velocity during the full eccentric phase (unweighting + braking combined). This represents the mean downward velocity from movement initiation to the lowest point.
The highest velocity reached during the propulsive phase
The average velocity during the propulsive phase
The peak instantaneous velocity during the propulsion phase
The instantaneous velocity at peak power (of entire dataset)
Force Development Rate of force development and force application speed
Average Rate-of-Force Development (RFD)
The average slope of force during the braking phase
Rate of force development during the deceleration portion of the braking phase, measured from minimum velocity to the end of braking (zero velocity. Similar to 'Braking RFD' or 'Load' in other systems, but specifically focused on the late braking phase.
Rate of force development during the eccentric phase, calculated from initial to peak force
Rate of force development during the propulsive phase, calculated from initial to peak force
P1/P2 Analysis Analysis of early vs late propulsive phase characteristics
Impulse generated during the first half of the propulsive phase (early triple-flexed position). Represents the first 50% of propulsive impulse, typically when the athlete is in a deeper squat position.
Impulse generated during the second half of the propulsive phase (to triple-extension position). Represents the final 50% of propulsive impulse, typically when the athlete is extending to takeoff.
Time duration of the first half of the propulsive phase. Indicates how quickly the athlete generates the first 50% of propulsive impulse from the triple-flexed position.
Time duration of the second half of the propulsive phase. Indicates how quickly the athlete generates the final 50% of propulsive impulse moving into triple-extension.
Average force during the first half of the propulsive phase. Indicates force production capability in the deep squat position.
Average force during the second half of the propulsive phase. Indicates force production capability in the extension to takeoff.
Ratio of average force in P1 to average force in P2. Values above 1.0 indicate stronger force production in the deeper position, while values below 1.0 indicate stronger force production during extension.
Ratio of P1 duration to P2 duration. Values above 1.0 indicate more time spent generating the first half of impulse, while values below 1.0 indicate faster early phase and more time spent in final extension.
Peak force during early propulsive phase (P1)
Peak velocity during early propulsive phase (P1)
Average velocity during early propulsive phase (P1)
Peak power during early propulsive phase (P1)
Average power during early propulsive phase (P1)
Peak force during late propulsive phase (P2)
Peak velocity during late propulsive phase (P2)
Average velocity during late propulsive phase (P2)
Peak power during late propulsive phase (P2)
Average power during late propulsive phase (P2)
Ratio of P1 to P2 average velocity, indicating early vs late phase velocity characteristics
Ratio of P1 to P2 average power, indicating early vs late phase power characteristics
Landing Metrics Force absorption and landing mechanics measurements
The maximum force recorded during the landing phase of the jump. Measures the ability to absorb force upon landing.
Relative Peak landing force; expressed as a multiple of body weight. Useful for comparing between individuals of different sizes.
Time from landing contact to peak landing force. Indicates how quickly peak forces are reached during landing.
Average rate of force development during landing, calculated from bodyweight to peak landing force over time. Indicates landing stiffness.
Rate of force development during the first 20ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 40ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 60ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 80ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Timing Timing related metrics
(Left) Time taken to reach peak instantaneous force (from start of jump)
Time it took to complete the unweighting phase
Duration of the braking/deceleration phase only, measured from Eccentric Peak Velocity (EPV) to the lowest point of the countermovement. This represents the time spent decelerating after reaching maximum downward velocity. Note: This is shorter than the full 'Eccentric Phase' which includes both unweighting and braking.
Time duration from the end of the braking phase (when velocity becomes positive) until takeoff. Sometimes referred to as 'Concentric Time' in other systems.
Time spent in the flight phase
The time from the start of the jump to the moment of peak power output
Max peak force encountered during the jump
Total time of muscular contraction from movement initiation to takeoff. For CMJ: includes eccentric and concentric phases. For SJ: the propulsive (concentric) phase only. For DJ/Pogo: time from landing contact to takeoff.
Time from the start of movement to takeoff. Indicates the total ground contact time before leaving the ground.
Time to reach peak force during braking phase, measured from braking start
Time to reach peak power during braking phase, measured from braking start
Time to reach peak force during eccentric phase, measured from jump start
Time to reach peak power during eccentric phase, measured from jump start
Time to reach peak force during propulsive phase, measured from propulsive start
Time to reach peak power during propulsive phase, measured from propulsive start
System Properties Basic system and timing measurements
Measured weight of the user during the weighting phase, just before the jump
Jump Performance Primary outcome measures of jump performance
Jump Height by Flight Time (FT)
Jump Height by Net Impulse (NI)
The velocity at takeoff
Flight Time / Contact Time (DJ). (Time-to-Takeoff for CMJ/SJ)
Jump Height / Contact Time (DJ). (Time-to-Takeoff (CMJ/SJ). Uses Net Impulse when available.
The momentum generated during the jump, calculated as the product of body mass and takeoff velocity.
Impulse Metrics Impulse metrics during braking and propulsive phases
The total impulse (bodyweight subtracted) applied during the braking+propulsive phase
Net impulse (force minus bodyweight) generated during the propulsive phase (from lowest position to takeoff). Represents the force-time integral that accelerates the body upward. Equivalent to 'Concentric Impulse' in some other systems.
Net impulse during the propulsive phase relative to body mass
Force Metrics Force measurements during various phases and conditions
The peak instantaneous force during the entire jump
The average force during the propulsive phase
Average force during the propulsive phase relative to body mass
The peak instantaneous force during the propulsive phase
Peak force output expressed as multiples of body weight
The instantaneous force at peak power (of entire dataset)
Power Power output throughout the jump
The maximum power output during the propulsive phase
The average power output during the propulsive phase
The total work done during the propulsive phase
The peak instantaneous power during the entire jump
Peak power output expressed as watts per kilogram of body weight
Velocity Velocity throughout the jump
The highest velocity reached during the propulsive phase
The average velocity during the propulsive phase
The peak instantaneous velocity during the propulsion phase
The instantaneous velocity at peak power (of entire dataset)
Force Development Rate of force development and force application speed
Average Rate-of-Force Development (RFD)
Rate of force development during the propulsive phase, calculated from initial to peak force
P1/P2 Analysis Analysis of early vs late propulsive phase characteristics
Impulse generated during the first half of the propulsive phase (early triple-flexed position). Represents the first 50% of propulsive impulse, typically when the athlete is in a deeper squat position.
Impulse generated during the second half of the propulsive phase (to triple-extension position). Represents the final 50% of propulsive impulse, typically when the athlete is extending to takeoff.
Time duration of the first half of the propulsive phase. Indicates how quickly the athlete generates the first 50% of propulsive impulse from the triple-flexed position.
Time duration of the second half of the propulsive phase. Indicates how quickly the athlete generates the final 50% of propulsive impulse moving into triple-extension.
Average force during the first half of the propulsive phase. Indicates force production capability in the deep squat position.
Average force during the second half of the propulsive phase. Indicates force production capability in the extension to takeoff.
Ratio of average force in P1 to average force in P2. Values above 1.0 indicate stronger force production in the deeper position, while values below 1.0 indicate stronger force production during extension.
Ratio of P1 duration to P2 duration. Values above 1.0 indicate more time spent generating the first half of impulse, while values below 1.0 indicate faster early phase and more time spent in final extension.
Peak force during early propulsive phase (P1)
Peak velocity during early propulsive phase (P1)
Average velocity during early propulsive phase (P1)
Peak power during early propulsive phase (P1)
Average power during early propulsive phase (P1)
Peak force during late propulsive phase (P2)
Peak velocity during late propulsive phase (P2)
Average velocity during late propulsive phase (P2)
Peak power during late propulsive phase (P2)
Average power during late propulsive phase (P2)
Ratio of P1 to P2 average velocity, indicating early vs late phase velocity characteristics
Ratio of P1 to P2 average power, indicating early vs late phase power characteristics
Landing Metrics Force absorption and landing mechanics measurements
The maximum force recorded during the landing phase of the jump. Measures the ability to absorb force upon landing.
Relative Peak landing force; expressed as a multiple of body weight. Useful for comparing between individuals of different sizes.
Time from landing contact to peak landing force. Indicates how quickly peak forces are reached during landing.
Average rate of force development during landing, calculated from bodyweight to peak landing force over time. Indicates landing stiffness.
Rate of force development during the first 20ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 40ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 60ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 80ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Timing Timing related metrics
(Left) Time taken to reach peak instantaneous force (from start of jump)
Time duration from the end of the braking phase (when velocity becomes positive) until takeoff. Sometimes referred to as 'Concentric Time' in other systems.
Time spent in the flight phase
The time from the start of the jump to the moment of peak power output
Max peak force encountered during the jump
Total time of muscular contraction from movement initiation to takeoff. For CMJ: includes eccentric and concentric phases. For SJ: the propulsive (concentric) phase only. For DJ/Pogo: time from landing contact to takeoff.
Time from the start of movement to takeoff. Indicates the total ground contact time before leaving the ground.
The time when the propulsive phase begins (when force transitions from braking to propulsive)
Time to reach peak force during propulsive phase, measured from propulsive start
Time to reach peak power during propulsive phase, measured from propulsive start
System Properties Basic system and timing measurements
Measured weight of the user during the weighting phase, just before the jump
Jump Performance Primary outcome measures of jump performance
Jump Height by Flight Time (FT)
The velocity at takeoff
Flight Time / Contact Time (DJ). (Time-to-Takeoff for CMJ/SJ)
Jump Height / Contact Time (DJ). (Time-to-Takeoff (CMJ/SJ). Uses Net Impulse when available.
Our own formula for RSI during Drop Jumps: FlightTime^2 / Contact Time
Dynamic Rebound Index: (Jump Height + Drop Height) / (g × Contact Time²). A drop-height-aware alternative to RSI, comparable across box heights. Developed by Dr. Lance Brooks, Bridgewater State University.
The calculated drop height, derived from the touchdown velocity (v²/2g). Typically differs from the nominal box height.
The momentum generated during the jump, calculated as the product of body mass and takeoff velocity.
Impulse Metrics Impulse metrics during braking and propulsive phases
The total impulse (bodyweight subtracted) applied during the braking+propulsive phase
Net impulse (force minus bodyweight) generated during the propulsive phase (from lowest position to takeoff). Represents the force-time integral that accelerates the body upward. Equivalent to 'Concentric Impulse' in some other systems.
Net impulse during the propulsive phase relative to body mass
Net impulse (force minus bodyweight) generated during the braking/deceleration phase only (from Eccentric Peak Velocity to lowest position). Quantifies how effectively the athlete decelerates after reaching maximum downward velocity. Note: For the full eccentric phase impulse (including unweighting), see 'Eccentric Impulse'.
Force Metrics Force measurements during various phases and conditions
The peak instantaneous force during the braking/deceleration phase only (from Eccentric Peak Velocity to lowest position). For full eccentric phase metrics, see 'Peak Eccentric Force'.
The average force during the braking/deceleration phase only (from Eccentric Peak Velocity to lowest position). For full eccentric phase metrics, see 'Avg Eccentric Force'.
The average force during the propulsive phase
Average force during the propulsive phase relative to body mass
The peak instantaneous force during the propulsive phase
The peak instantaneous force during the entire jump
Peak force output expressed as multiples of body weight
The instantaneous force at peak power (of entire dataset)
Power Power output throughout the jump
The peak instantaneous power during the braking/deceleration phase only (negative value). For full eccentric phase metrics as absolute value, see 'Peak Eccentric Power'.
The average mechanical power during the braking/deceleration phase only (negative value). For full eccentric phase metrics as absolute value, see 'Avg Eccentric Power'.
The total work done during the braking/deceleration phase only (negative value). For full eccentric phase metrics as absolute value, see 'Eccentric Work'.
The maximum power output during the propulsive phase
The average power output during the propulsive phase
The total work done during the propulsive phase
The peak instantaneous power during the entire jump
Peak power output expressed as watts per kilogram of body weight
Velocity Velocity throughout the jump
The minimum velocity during the braking phase
The average velocity during the braking phase
The highest velocity reached during the propulsive phase
The average velocity during the propulsive phase
The peak instantaneous velocity during the propulsion phase
The instantaneous velocity at peak power (of entire dataset)
Force Development Rate of force development and force application speed
The average slope of force during the braking phase
Rate of force development during the propulsive phase, calculated from initial to peak force
P1/P2 Analysis Analysis of early vs late propulsive phase characteristics
Impulse generated during the first half of the propulsive phase (early triple-flexed position). Represents the first 50% of propulsive impulse, typically when the athlete is in a deeper squat position.
Impulse generated during the second half of the propulsive phase (to triple-extension position). Represents the final 50% of propulsive impulse, typically when the athlete is extending to takeoff.
Time duration of the first half of the propulsive phase. Indicates how quickly the athlete generates the first 50% of propulsive impulse from the triple-flexed position.
Time duration of the second half of the propulsive phase. Indicates how quickly the athlete generates the final 50% of propulsive impulse moving into triple-extension.
Average force during the first half of the propulsive phase. Indicates force production capability in the deep squat position.
Average force during the second half of the propulsive phase. Indicates force production capability in the extension to takeoff.
Ratio of average force in P1 to average force in P2. Values above 1.0 indicate stronger force production in the deeper position, while values below 1.0 indicate stronger force production during extension.
Ratio of P1 duration to P2 duration. Values above 1.0 indicate more time spent generating the first half of impulse, while values below 1.0 indicate faster early phase and more time spent in final extension.
Peak force during early propulsive phase (P1)
Peak velocity during early propulsive phase (P1)
Average velocity during early propulsive phase (P1)
Peak power during early propulsive phase (P1)
Average power during early propulsive phase (P1)
Peak force during late propulsive phase (P2)
Peak velocity during late propulsive phase (P2)
Average velocity during late propulsive phase (P2)
Peak power during late propulsive phase (P2)
Average power during late propulsive phase (P2)
Ratio of P1 to P2 average velocity, indicating early vs late phase velocity characteristics
Ratio of P1 to P2 average power, indicating early vs late phase power characteristics
Landing Metrics Force absorption and landing mechanics measurements
The maximum force recorded during the landing phase of the jump. Measures the ability to absorb force upon landing.
Relative Peak landing force; expressed as a multiple of body weight. Useful for comparing between individuals of different sizes.
Time from landing contact to peak landing force. Indicates how quickly peak forces are reached during landing.
Average rate of force development during landing, calculated from bodyweight to peak landing force over time. Indicates landing stiffness.
Rate of force development during the first 20ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 40ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 60ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 80ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Timing Timing related metrics
Time spent in the flight phase
The time from the start of the jump to the moment of peak power output
Max peak force encountered during the jump
Total time of muscular contraction from movement initiation to takeoff. For CMJ: includes eccentric and concentric phases. For SJ: the propulsive (concentric) phase only. For DJ/Pogo: time from landing contact to takeoff.
Time from the start of movement to takeoff. Indicates the total ground contact time before leaving the ground.
Time to reach peak force during braking phase, measured from braking start
Time to reach peak power during braking phase, measured from braking start
Time to reach peak force during propulsive phase, measured from propulsive start
Time to reach peak power during propulsive phase, measured from propulsive start
System Properties Basic system and timing measurements
Measured weight of the user during the weighting phase, just before the jump
Jump Performance Primary outcome measures of jump performance
Jump Height by Flight Time (FT)
Jump Height by Net Impulse (NI)
The velocity at takeoff
Flight Time / Contact Time (DJ). (Time-to-Takeoff for CMJ/SJ)
Jump Height / Contact Time (DJ). (Time-to-Takeoff (CMJ/SJ). Uses Net Impulse when available.
The momentum generated during the jump, calculated as the product of body mass and takeoff velocity.
Maximum depth of the countermovement phase, representing how far the center of mass descends before the propulsive phase begins.
Vertical momentum at takeoff of the rebound jump (body mass × takeoff velocity).
Reactive Strength Index of rebound jump (jump height ÷ contact time).
Jump height of the rebound jump, calculated from flight time.
Modified Reactive Strength Index of rebound jump (jump height ÷ contact time, modified formulation).
Impulse Metrics Impulse metrics during braking and propulsive phases
The total impulse (bodyweight subtracted) applied during the braking+propulsive phase
Net impulse over the full eccentric phase (unweighting + braking combined). Because the athlete starts and ends this phase at rest, the two sub-phases largely cancel — values near zero are normal.
Net impulse (force minus bodyweight) generated during the propulsive phase (from lowest position to takeoff). Represents the force-time integral that accelerates the body upward. Equivalent to 'Concentric Impulse' in some other systems.
Net impulse during the propulsive phase relative to body mass
Net impulse (force minus bodyweight) generated during the braking/deceleration phase only (from Eccentric Peak Velocity to lowest position). Quantifies how effectively the athlete decelerates after reaching maximum downward velocity. Note: For the full eccentric phase impulse (including unweighting), see 'Eccentric Impulse'.
Total impulse generated during rebound braking phase.
Total impulse generated during rebound propulsive phase.
Force Metrics Force measurements during various phases and conditions
The peak instantaneous force during the entire jump
The minimum force measured during the unweighting phase
Relative min unweighting weight. The minimum force during unweighting expressed as a multiple of body weight
The peak instantaneous force during the braking/deceleration phase only (from Eccentric Peak Velocity to lowest position). For full eccentric phase metrics, see 'Peak Eccentric Force'.
The average force during the braking/deceleration phase only (from Eccentric Peak Velocity to lowest position). For full eccentric phase metrics, see 'Avg Eccentric Force'.
The average force during the full eccentric phase (unweighting + braking combined). This represents the mean force from movement initiation to the lowest point of the countermovement.
The peak instantaneous force during the full eccentric phase (unweighting + braking combined). This represents the maximum force from movement initiation to the lowest point of the countermovement.
The average force during the propulsive phase
Average force during the propulsive phase relative to body mass
The peak instantaneous force during the propulsive phase
Peak force output expressed as multiples of body weight
The instantaneous force at peak power (of entire dataset)
The total force (ground reaction force) measured at the point of maximum displacement depth during the countermovement. This represents the force applied when the athlete reaches the bottom of their countermovement.
Relative force @min displacement. The force at minimum displacement expressed as a multiple of body weight.
Vertical force at the lowest point of CoM displacement during rebound contact.
Force at min displacement during rebound, normalized to body weight.
Average vertical force during rebound braking phase.
Peak vertical force during rebound braking phase.
Average vertical force during rebound propulsive phase.
Peak vertical force during rebound propulsive phase.
Power Power output throughout the jump
The peak instantaneous power during the braking/deceleration phase only (negative value). For full eccentric phase metrics as absolute value, see 'Peak Eccentric Power'.
The average mechanical power during the braking/deceleration phase only (negative value). For full eccentric phase metrics as absolute value, see 'Avg Eccentric Power'.
The total work done during the braking/deceleration phase only (negative value). For full eccentric phase metrics as absolute value, see 'Eccentric Work'.
The peak instantaneous power during the full eccentric phase (unweighting + braking combined). Reported as absolute value. High values indicate strong eccentric power capacity.
The average mechanical power during the full eccentric phase (unweighting + braking combined). Reported as absolute value. Represents the mean rate of energy absorption during the downward phase.
The total work done during the full eccentric phase (unweighting + braking combined). Reported as absolute value. Quantifies total energy absorbed from movement initiation to lowest position.
The maximum power output during the propulsive phase
The average power output during the propulsive phase
The total work done during the propulsive phase
The peak instantaneous power during the entire jump
Peak power output expressed as watts per kilogram of body weight
Average power during rebound braking phase.
Peak power during rebound braking phase.
Average power during rebound propulsive phase.
Peak power during rebound propulsive phase.
The total work done during the rebound braking phase.
The total work done during the rebound propulsive phase.
Velocity Velocity throughout the jump
The minimum velocity during the braking phase
The average velocity during the braking phase
The minimum (most negative) velocity during the full eccentric phase. This represents the peak downward velocity, also known as Eccentric Peak Velocity (EPV), which marks the transition from unweighting to braking.
The average velocity during the full eccentric phase (unweighting + braking combined). This represents the mean downward velocity from movement initiation to the lowest point.
The highest velocity reached during the propulsive phase
The average velocity during the propulsive phase
The peak instantaneous velocity during the propulsion phase
The instantaneous velocity at peak power (of entire dataset)
The minimum velocity during the rebound braking phase.
The average velocity during the rebound braking phase.
The highest velocity reached during the rebound propulsive phase.
The average velocity during the rebound propulsive phase.
Force Development Rate of force development and force application speed
Average Rate-of-Force Development (RFD)
The average slope of force during the braking phase
Rate of force development during the deceleration portion of the braking phase, measured from minimum velocity to the end of braking (zero velocity. Similar to 'Braking RFD' or 'Load' in other systems, but specifically focused on the late braking phase.
Rate of force development during the eccentric phase, calculated from initial to peak force
Rate of force development during the propulsive phase, calculated from initial to peak force
The average slope of force during the rebound braking phase.
Rate of force development during the rebound propulsive phase, calculated from initial to peak force.
P1/P2 Analysis Analysis of early vs late propulsive phase characteristics
Impulse generated during the first half of the propulsive phase (early triple-flexed position). Represents the first 50% of propulsive impulse, typically when the athlete is in a deeper squat position.
Impulse generated during the second half of the propulsive phase (to triple-extension position). Represents the final 50% of propulsive impulse, typically when the athlete is extending to takeoff.
Time duration of the first half of the propulsive phase. Indicates how quickly the athlete generates the first 50% of propulsive impulse from the triple-flexed position.
Time duration of the second half of the propulsive phase. Indicates how quickly the athlete generates the final 50% of propulsive impulse moving into triple-extension.
Average force during the first half of the propulsive phase. Indicates force production capability in the deep squat position.
Average force during the second half of the propulsive phase. Indicates force production capability in the extension to takeoff.
Ratio of average force in P1 to average force in P2. Values above 1.0 indicate stronger force production in the deeper position, while values below 1.0 indicate stronger force production during extension.
Ratio of P1 duration to P2 duration. Values above 1.0 indicate more time spent generating the first half of impulse, while values below 1.0 indicate faster early phase and more time spent in final extension.
Peak force during early propulsive phase (P1)
Peak velocity during early propulsive phase (P1)
Average velocity during early propulsive phase (P1)
Peak power during early propulsive phase (P1)
Average power during early propulsive phase (P1)
Peak force during late propulsive phase (P2)
Peak velocity during late propulsive phase (P2)
Average velocity during late propulsive phase (P2)
Peak power during late propulsive phase (P2)
Average power during late propulsive phase (P2)
Ratio of P1 to P2 average velocity, indicating early vs late phase velocity characteristics
Ratio of P1 to P2 average power, indicating early vs late phase power characteristics
Impulse during first half of rebound propulsive phase (split at 50% of total propulsive impulse).
Impulse during second half of rebound propulsive phase (split at 50% of total propulsive impulse).
Time duration of the first half of the rebound propulsive phase.
Peak force during early rebound propulsive phase (P1).
Average force during the first half of the rebound propulsive phase.
Peak velocity during early rebound propulsive phase (P1).
Average velocity during early rebound propulsive phase (P1).
Peak power during early rebound propulsive phase (P1).
Average power during early rebound propulsive phase (P1).
Time duration of the second half of the rebound propulsive phase.
Peak force during late rebound propulsive phase (P2).
Average force during the second half of the rebound propulsive phase.
Peak velocity during late rebound propulsive phase (P2).
Average velocity during late rebound propulsive phase (P2).
Peak power during late rebound propulsive phase (P2).
Average power during late rebound propulsive phase (P2).
Ratio of average force in rebound P1 to rebound P2.
Ratio of rebound P1 to P2 average velocity, indicating early vs late phase velocity characteristics.
Ratio of rebound P1 to P2 average power, indicating early vs late phase power characteristics.
Ratio of rebound P1 duration to rebound P2 duration.
Landing Metrics Force absorption and landing mechanics measurements
The maximum force recorded during the landing phase of the jump. Measures the ability to absorb force upon landing.
Relative Peak landing force; expressed as a multiple of body weight. Useful for comparing between individuals of different sizes.
Time from landing contact to peak landing force. Indicates how quickly peak forces are reached during landing.
Average rate of force development during landing, calculated from bodyweight to peak landing force over time. Indicates landing stiffness.
Rate of force development during the first 20ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 40ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 60ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Rate of force development during the first 80ms after landing (post-jump). For DJ, this is the final landing, not the initial drop contact.
Timing Timing related metrics
(Left) Time taken to reach peak instantaneous force (from start of jump)
Time it took to complete the unweighting phase
Duration of the braking/deceleration phase only, measured from Eccentric Peak Velocity (EPV) to the lowest point of the countermovement. This represents the time spent decelerating after reaching maximum downward velocity. Note: This is shorter than the full 'Eccentric Phase' which includes both unweighting and braking.
Time duration from the end of the braking phase (when velocity becomes positive) until takeoff. Sometimes referred to as 'Concentric Time' in other systems.
Time spent in the flight phase
The time from the start of the jump to the moment of peak power output
Max peak force encountered during the jump
Total time of muscular contraction from movement initiation to takeoff. For CMJ: includes eccentric and concentric phases. For SJ: the propulsive (concentric) phase only. For DJ/Pogo: time from landing contact to takeoff.
Time from the start of movement to takeoff. Indicates the total ground contact time before leaving the ground.
Time to reach peak force during braking phase, measured from braking start
Time to reach peak power during braking phase, measured from braking start
Time to reach peak force during eccentric phase, measured from jump start
Time to reach peak power during eccentric phase, measured from jump start
Time to reach peak force during propulsive phase, measured from propulsive start
Time to reach peak power during propulsive phase, measured from propulsive start
Airborne duration of the rebound jump.
Time from start of rebound contact to peak braking force.
Time from start of rebound contact to rebound takeoff.
Ground contact duration between landing from CMJ and takeoff of the rebound jump.
Time to reach peak power during rebound braking phase, measured from braking start.
Time to reach peak force during rebound propulsive phase, measured from propulsive start.
Time to reach peak power during rebound propulsive phase, measured from propulsive start.
System Properties Basic system and timing measurements
Measured weight of the user during the weighting phase, just before the jump
Jump Performance Primary outcome measures of pogo jump performance
Jump Height by Flight Time (FT)
Reactive Strength Index - ratio of flight time to contact time
Modified Reactive Strength Index - ratio of jump height to contact time
Power Power output metrics during pogo jumps
Peak power output during the jump
Power output normalized to body weight
Timing Time-based metrics for contact and flight phases
Time spent in contact with the ground between landing and takeoff
Time spent in the air during the jump
Bilateral Symmetry Left-right force distribution and symmetry
Percentage of force contributed by the left side
Force Force output metrics during pogo jumps
Maximum force applied during ground contact phase
Mean force applied during ground contact phase
System Properties Basic system measurements
Measured weight of the athlete
Force Force measurement metrics during muscle contractions
Force at the onset of the contraction
Force achieved at the point where First force time derivate approach steady state
Peak Force (highest force value during the maximum voluntary contraction)
Force at 50ms from onset
Force at 100ms from onset
Force at 150ms from onset
Force at 200ms from onset
Force at 250ms from onset
Force at the point where maximum RFD is reached
Bodyweight measured on the force platform
Rate of Force Development Metrics measuring how quickly force is developed during contractions
Peak Rate of Force Development during contraction
Rate of Force Development at 50ms from onset
Rate of Force Development at 100ms from onset
Rate of Force Development at 150ms from onset
Rate of Force Development at 200ms from onset
Rate of Force Development at 250ms from onset
Impulse Impulse metrics measuring force integrated over time periods
Impulse from onset to 50ms
Impulse from onset to 100ms
Impulse from onset to 150ms
Impulse from onset to 200ms
Impulse from onset to 250ms
Impulse from onset to maximum RFD
Impulse from onset to peak force
Steadiness Metrics measuring the stability and consistency of force output
Root mean square error of force during steady state
Root mean square error of RFD during steady state
Timing Timing related metrics
Time from onset to maximum RFD
Time from onset to End Of Rise during contraction
Time of onset of the contraction (from the beginning of the signal)
Time from onset to peak force during maximum voluntary contraction
Torque Torque metrics calculated by multiplying force by limb length
Torque at the onset of the contraction
Torque achieved at the point where First torque time derivate approach steady state
Peak Torque (highest torque value during the maximum voluntary contraction)
Torque at 50ms from onset
Torque at 100ms from onset
Torque at 150ms from onset
Torque at 200ms from onset
Torque at 250ms from onset
Torque at the point where maximum RFD is reached
Net Force Force measurement metrics during muscle contractions (bodyweight subtracted)
(Net) Force at the onset of the contraction
(Net) Force achieved at the point where First force time derivate approach steady state
(Net) Peak Force (highest force value during the maximum voluntary contraction)
(Net) Force at 50ms from onset
(Net) Force at 100ms from onset
(Net) Force at 150ms from onset
(Net) Force at 200ms from onset
(Net) Force at 250ms from onset
(Net) Force at the point where maximum RFD is reached
Relative Force Force measurement metrics during muscle contractions (normalized to bodyweight)
Force at the onset of the contraction as a percentage of body weight
Force achieved at the point where First force time derivate approach steady state as a percentage of body weight
Peak Force (highest force value during the maximum voluntary contraction) as a percentage of body weight
Force at 50ms from onset as a percentage of body weight
Force at 100ms from onset as a percentage of body weight
Force at 150ms from onset as a percentage of body weight
Force at 200ms from onset as a percentage of body weight
Force at 250ms from onset as a percentage of body weight
Force at the point where maximum RFD is reached as a percentage of body weight
Relative Net Force Force measurement metrics during muscle contractions (bodyweight subtracted, normalized to bodyweight)
(Net) Force at the onset of the contraction as a percentage of body weight
(Net) Force achieved at the point where First force time derivate approach steady state as a percentage of body weight
(Net) Peak Force (highest force value during the maximum voluntary contraction) as a percentage of body weight
(Net) Force at 50ms from onset as a percentage of body weight
(Net) Force at 100ms from onset as a percentage of body weight
(Net) Force at 150ms from onset as a percentage of body weight
(Net) Force at 200ms from onset as a percentage of body weight
(Net) Force at 250ms from onset as a percentage of body weight
(Net) Force at the point where maximum RFD is reached as a percentage of body weight
Net Impulse Impulse metrics measuring force integrated over time periods (bodyweight subtracted)
(Net) Impulse from onset to 50ms
(Net) Impulse from onset to 100ms
(Net) Impulse from onset to 150ms
(Net) Impulse from onset to 200ms
(Net) Impulse from onset to 250ms
(Net) Impulse from onset to maximum RFD
(Net) Impulse from onset to peak force
Relative Impulse Impulse metrics measuring force integrated over time periods (normalized to bodyweight)
Impulse from onset to 50ms as a percentage of body weight
Impulse from onset to 100ms as a percentage of body weight
Impulse from onset to 150ms as a percentage of body weight
Impulse from onset to 200ms as a percentage of body weight
Impulse from onset to 250ms as a percentage of body weight
Impulse from onset to maximum RFD as a percentage of body weight
Impulse from onset to peak force as a percentage of body weight
Relative Net Impulse Impulse metrics measuring force integrated over time periods (bodyweight subtracted, normalized to bodyweight)
(Net) Impulse from onset to 50ms as a percentage of body weight
(Net) Impulse from onset to 100ms as a percentage of body weight
(Net) Impulse from onset to 150ms as a percentage of body weight
(Net) Impulse from onset to 200ms as a percentage of body weight
(Net) Impulse from onset to 250ms as a percentage of body weight
(Net) Impulse from onset to maximum RFD as a percentage of body weight
(Net) Impulse from onset to peak force as a percentage of body weight
Velocity Metrics Speed of center of pressure movement
Average velocity of the center of pressure movement
Displacement Metrics Total path length of center of pressure movement
Total distance traveled by the center of pressure
Area Metrics Spatial distribution of center of pressure movement
Area of the 95% confidence ellipse containing the center of pressure trajectory
Weight Shift
Percentage of weight on left plate at peak backswing
Percentage of weight on left plate at impact
Maximum change in weight distribution from backswing to impact
Timing
Time from peak backswing to weight reversal
Time from swing start to peak backswing
Time from peak backswing to impact
Total time from swing start to impact
Backswing duration divided by downswing duration (ideal ~3:1)
Force
Maximum vertical ground reaction force at impact
Average vertical ground reaction force during swing
Rate of force application during downswing
Peak Rate of Torque development during downswing transition
Rate of Torque development at 100ms from transition
Rate of Torque development at 200ms from transition
CoP Position
Center of pressure lateral position at peak backswing
Center of pressure anterior-posterior position at peak backswing
Center of pressure lateral position at transition
Center of pressure anterior-posterior position at transition
Center of pressure lateral position at impact
Center of pressure anterior-posterior position at impact
CoP Movement
Total distance traveled by center of pressure during swing
95% confidence ellipse area encompassing CoP movement (indicates stability)
Maximum velocity of center of pressure during transition phase
Total lateral (side-to-side) range of center of pressure movement
Total anterior-posterior (front-back) range of center of pressure movement
Total distance of center of pressure shift from backswing to impact
Force Force measurement metrics during muscle contractions
Force at the onset of the contraction
Force achieved at the point where First force time derivate approach steady state
Peak Force (highest force value during the maximum voluntary contraction)
Force at 50ms from onset
Force at 100ms from onset
Force at 150ms from onset
Force at 200ms from onset
Force at 250ms from onset
Force at the point where maximum RFD is reached
Bodyweight measured on the force platform
Rate of Force Development Metrics measuring how quickly force is developed during contractions
Peak Rate of Force Development during contraction
Rate of Force Development at 50ms from onset
Rate of Force Development at 100ms from onset
Rate of Force Development at 150ms from onset
Rate of Force Development at 200ms from onset
Rate of Force Development at 250ms from onset
Impulse Impulse metrics measuring force integrated over time periods
Impulse from onset to 50ms
Impulse from onset to 100ms
Impulse from onset to 150ms
Impulse from onset to 200ms
Impulse from onset to 250ms
Impulse from onset to maximum RFD
Impulse from onset to peak force
Steadiness Metrics measuring the stability and consistency of force output
Root mean square error of force during steady state
Root mean square error of RFD during steady state
Timing Timing related metrics
Time from onset to maximum RFD
Time from onset to End Of Rise during contraction
Time of onset of the contraction (from the beginning of the signal)
Time from onset to peak force during maximum voluntary contraction
Torque Torque metrics calculated by multiplying force by limb length
Torque at the onset of the contraction
Torque achieved at the point where First torque time derivate approach steady state
Peak Torque (highest torque value during the maximum voluntary contraction)
Torque at 50ms from onset
Torque at 100ms from onset
Torque at 150ms from onset
Torque at 200ms from onset
Torque at 250ms from onset
Torque at the point where maximum RFD is reached
Go deeper on the metrics
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