Parameters explained - measurement metrics

Description of available statistics

Conc Mean Force (N):

This is the average force that was applied over the concentric phase of the lift. It is calculated by summing the individual forces for each data point and dividing by the number of data points obtained in the concentric phase of the lift.
The following equation is used to calculate force.
f = m*(a+g).
Where f = force (Newton), m = mass, a = acceleration of the weight g = gravity (9.81)

Conc Mean Power (W)

This is the average power that was applied over the concentric phase of the lift. It is calculated by summing the individual powers for each data point and dividing by the number of data points obtained in the concentric phase of the lift.
The following equation is used to calculate power.
p = f * v.
Where p = power (watts), f = force and v = velocity

Conc Mean Velocity (m/s)

This is the average velocity that was obtained over the concentric phase of the lift. It is calculated by summing the individual velocities for each data point and dividing by the number of data points obtained in the concentric phase of the lift. The following equation is used to calculate velocity.
V = Change in d/change in t.
Where v = velocity, d = distance and t= time i.e. (d2-d1) / (t2-t1)

Conc Peak Accel (m/s2)

This is the peak acceleration that was obtained over the concentric phase of the lift. It is an instantaneous measure, measured over a sample period of approximately 20 milliseconds. The following equation is used to calculate acceleration.
a = Change in v/change in t.
Where a= acceleration, v= velocity and t= time i.e. (v2-v1) / (t2-t1)

Conc Peak Force (N)

This is the peak force that was obtained over the concentric phase of the lift. It is an instantaneous measure, measured over a sample period of approximately 20 milliseconds.
The following equation is used to calculate force.
f = m*(a+g)
Where f = force, m=mass a= acceleration, g= gravity (9.81)

Conc Peak Power (W)

This is the peak power that was obtained over the concentric phase of the lift. It is an instantaneous value, measured over a sample period of approximately 20 milliseconds.
The following equation is used to calculate power.
p = f * v
Where p= power, f= force and v=velocity

Conc Peak Velocity (Max Velocity) (m/s)

This is the peak velocity measured over the concentric phase of the lift. It is an instantaneous value, measured over a sample period of approximately 20 milliseconds.
The following equation is used to calculate velocity.
v = Change in d/change in t.
Where v= velocity, d = distance and t= time i.e. (d2-d1) / (t2-t1)

Conc Rep Duration (s)

This is the duration of time taken to complete the concentric (lifting) phase of an exercise.
t =(t2-t1)
where t = time in seconds, t1 = time at start of concentric phase t2 = time at finish of concentric phase

Conc Work (J)

This is the amount of physiological work performed in lifting the weight from its lowest point in any particular repetition to its highest point.
Its calculated by the following equation;
W=mgh
Where W =work (Joules), m = mass, g= gravity (9.81) and h = height of lift

Dip (m)

This is the distance the weights were moved below the zero point. The zero point is automatically set after you press âokâ on the weight dialog on the palm application.
Itâs the starting position of the lift. This is also when the App begins to record data.
For example, when performing squat exercises, you start in the standing position with the weights on the shoulders (this is the zero point). Perform the squat until the thighs are parallel to the ground. The distance that you have squatted is the dip.

Ecc Mean Force (N)

This is the average force that was applied over the eccentric phase of the lift. It is calculated by summing the individual forces for each data point and dividing by the number of data points obtained in the eccentric phase of the lift.
The following equation is used to calculate force.
f = m*(a+g)
Where f = force (Newton), m = mass, a = acceleration of the weight g = gravity (9.81)

Ecc Peak Force (N)

This is the peak force that was obtained over the eccentric phase of the lift. It is an instantaneous measure, measured over a sample period of approximately 20 milliseconds.
The following equation is used to calculate force.
f= m*(a+g)
Where f= force, m=mass a= acceleration, g= gravity (9.81)

Ecc Mean Power (W)

This is the average power that was applied over the eccentric phase of the lift. It is calculated by summing the individual powers for each data point and dividing by the number of data points obtained in the eccentric phase of the lift.
The following equation is used to calculate power.
p = f * v.
Where p = power (watts), f = force and v = velocity

Ecc Peak Power (W)

This is the peak power that was obtained over the eccentric phase of the lift. It is an instantaneous value, measured over a sample period of approximately 20 milliseconds.
The following equation is used to calculate power.
p = f * v
Where p= power, f= force and v= velocity

Ecc Peak Accel (m/s2)

This is the peak acceleration that was obtained over the eccentric phase of the lift. It is an instantaneous measure, measured over a sample period of approximately 20 milliseconds.
The following equation is used to calculate acceleration.
a = Change in v/change in t
Where a= acceleration, v= velocity and t= time i.e. (v2-v1) / (t2-t1)

Ecc Peak Velocity (m/s)

This is the peak velocity measured over the eccentric phase of the lift. It is an instantaneous value, measured over a sample period of approximately 20 milliseconds.
The following equation is used to calculate velocity.
v = Change in d/change in t
Where v= velocity, d = distance and t= time i.e. (d2-d1) / (t2-t1)

Ecc Rep Duration (s)

This is the duration of time taken to complete the eccentric (lowering) phase of an exercise.
T =(t2-t1)
where t = time in seconds, t1 = time at start of eccentric phase t2 = time at finish of eccentric phase

Height (m)

This is the distance the weights were moved above the zero point. The zero point is automatically set after you press "Set zero"  on the weight dialog on the App. This is also the moment when the App begins to record data. - you can click on you graph result and set a new zero position if need be - height will then be recalculated as vertical displacement above this point.
Note: height is calculated corrected for horizontal displacement errors.

To set a valid zero starting position, attach the linear encoder to either a waist strap on the subject or the weights bar resting across their shoulders. (as with a smith machine).
Instruct the subject to stand on their tips of their toes, select the exercise, enter the weight.
Instruct the subject to perform the exercise (to jump). Height is calculated as described above.

 

Reactive Strength Index (RSI)

RSI = Jump Height / Ground Contact Time

The reactive strength index measures the reactive jump capacity of the athletes and is obtained be completing a drop jump.

The athlete must first start at ground level and step-up onto a block or box prior to stepping off and immediately rebounding back off the floor, with the intent to jump as quickly and high as possible.

Note . If the start position is NOT set at floor level then RSI will not calculate

 

 

Dip (m)

This is the distance the weights were moved below the zero point.

Note: Dip is calculated corrected for horizontal displacement errors.

Lift Distance (m)

This is the distance the weights were moved from the very bottom of each lift to the very top of each lift - It is not corrected for errors due to horizontal displacement.
Therefore its the total distance the tether has been extended during each repetition.

Vertical Distance (m)

This is the distance the weights were moved from the very bottom of each lift to the very top of each lift corrected for errors due to horizontal displacement. Therefore this measurement only reports the vertical displacement component of each repetition.

Rep Duration (s)

This is the time in seconds to complete both the concentric and eccentric phases of the lift, or the time to complete one full repetition of an exercise. The Rep duration is the difference between the rep start time and the rep end time

Rep End (s)

This is the exact end-time of any repetition. It is determined by the analysis softwares ability to automatically define the phases of the lift.

Rep Start (s)

This is the exact start-time of any repetition. It is determined by the analysis softwares ability to automatically define the phases of the lift.