## 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

### Mean Watts/KG

This is the average power that was applied over the concentric phase of lift divided by the Athletes' body mass

### Peak Watts/KG

This is the peak power that was applied over the concentric phase of the lift divided by the athletes' body mass

### 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 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 start point of the eccentric phase.

For example, when performing squat exercises, you start in the standing position with the weights on the shoulders (this is the start point). Perform the squat until the thighs are parallel to the ground. The distance that you have squatted is the **dip**.

**Note:** Dip is calculated and corrected for horizontal displacement errors.

### Time to Peak Velocity

This is the time taken to reach Peak Velocity during the concentric phase.

### Time to Peak Force

This is the time taken to reach Peak Force during the concentric phase.

### Time to Peak Power

This is the time taken to reach Peak Power during the concentric phase.

### 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 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 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.

### Height at Max Back (m)

This is the vertical height from start of concentric phase where barbell position is furthest backward of the vertical axis.

### Height at Max Forward (m)

This is the vertical height from start of concentric phase where barbell position is furthest forward of the vertical axis.

### 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.

### Max Back (m)

This is the distance the tether is moved to the furthest backward horizontal movement of the vertical axis.

### Max Forward (m)

This is the distance the tether is moved to the furthest forward horizontal movement of the vertical axis.

### Reactive Strength Index (RSI)

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

### 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 Rate (M)

this is reps/minute which takes the information from rep duration (s) and predicts how many reps can be produced in a minute.

### Nordic Displacement

This Measures the Nordic movement from the concentric to the free fall phase.

### 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.

### Total Travel Path (m)

Total travel path is the total distance travelled not taking into account any horizontal or vertical displacement.

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