Left/Right Triple Hop

Left/Right Triple Hop - Timepoints

Start/Initial Contact:

Definition: First instant in time where the individual makes contact with the force plate and start of the braking phase.
Calculation: GRFz > 20N
Units: Frame #

Loading End:

Definition: End of the loading phase and start of the stabilization phase.
Calculation: frame of max vertical force
Units: Frame #

Stabilization End:

Definition: End of the stabilization phase
Calculation: min GRFz(N) [frame of max vertical force: end] 
Units: Frame #

Left/Right Triple Hop - KPI

Ground Contact Time:

Definition: Elapsed time between initial contact and takeoff
Calculation: Timetakeoff(s) – Timeinitial contact(s) 
Units: Seconds (s)

Left/Right Triple Hop - Sub phase Metrics

Phase Time:

Definition: Temporal duration of the selected phase. 
Calculation: ∆phase time(s) 
Units: Seconds (s)

Avg Force:

Definition: Average vertical force production during the selected phase. 
Calculation: mean vertical GRFz (N)
Units: Newtons (N)

Avg Force Rel:

Definition: Average vertical force production during the selected phase normalized to participant’s body mass. 
Calculation: mean vertical GRFz (N)/ body mass (kg)
Units: Newtons per kilogram (N/kg)

Peak Force:

Definition: Peak vertical force production during the selected phase normalized to participant’s body mass. 
Calculation: maximum GRFz (N) during the selected phase 
Units: Newtons (N)

Peak Force Rel:

Definition: Peak vertical force production during the selected phase normalized to participant’s body mass. 
Calculation: maximum GRFz (N) during the selected phase / mass (kg)
Units: Newtons per kilogram (N/kg)

Avg RFD:

Definition: Average rate of force development during the selected phase. 
Calculation: mean GRFz(N)/ Time (s) across the selected phase
Units: Newtons per second (N/s)

Avg RFD Rel:

Definition: Average rate of force development during the selected phase normalized to participant’s body mass. 
Calculation: mean GRFz(N)/ Time (s) across the selected phase / mass(kg) 
Units: Newtons per second per kilogram (N/s/kg)

Peak RFD:

Definition: Peak rate of force development during the selected phase. 
Calculation: maximum GRFz(N)/ Time (s) across the selected phase 
Units: Newtons per second (N/s)

Peak RFD Rel:

Definition: Peak rate of force development during the selected phase normalized to body mass. 
Calculation: maximum GRFz(N)/ Time (s) across the selected phase divided by mass(kg)
Units: Newtons per second per kilogram (N/s/kg)

Torso Angle:

Definition: Segment angle of the torso at the end of the selected phase.  
Calculation:
Units: Degrees (°)

Hip Flexion Angle L:

Definition: Left hip joint flexion/ extension angle at the end of the selected phase. 
Calculation:
Units: Degrees (°)

Hip Flexion Angle R:

Definition: Right hip flexion/ extension joint angle at the end of the selected phase. 
Calculation:
Units: Degrees (°)

Hip Add Angle L:

Definition: Left hip joint adduction/abduction angle at the end of the selected phase. 
Calculation:
Units: Degrees (°)

Hip Add Angle R:

Definition: Right hip joint adduction/abduction angle at the end of the selected phase. 
Calculation:
Units: Degrees (°)

Hip IR Angle L:

Definition: Left hip joint internal/external rotation angle at the end of the selected phase. 
Calculation:
Units: Degrees (°)

Hip IR Angle R:

Definition: Right hip joint internal/external rotation angle at the end of the selected phase. 
Calculation:
Units: Degrees (°)

Knee Flexion Angle L:

Definition: Left knee joint flexion/ extension angle at the end of the selected phase. 
Calculation:
Units: Degrees (°)

Knee Flexion Angle R:

Definition: Right knee joint flexion/ extension angle at the end of the selected phase. 
Calculation:
Units: Degrees (°)

Ankle Flexion Angle L:

Definition: Left ankle joint flexion/ extension angle at the end of the selected phase. 
Calculation:
Units: Degrees (°)

Ankle Flexion Angle R:

Definition: Right ankle joint flexion/ extension angle at the end of the selected phase.
Calculation:
Units: Degrees (°)