Table 2. List and definition of force-time metric examined in the present study.
Strategy Metrics (unit) | Definition |
Braking Phase Duration (s) | Duration of the braking phase |
CON Phase Duration (s) | Duration of the CON phase |
Countermovement Depth (cm) | Lowest center of mass displacement, transition from ECC to CON phase |
ECC Deceleration Phase Duration (s) | Duration of the ECC deceleration phase |
ECC Peak Velocity (m•s-1) | Maximal velocity obtained during the ECC phase |
Driver Metrics (unit) | Definition |
CON Impulse (N•s) | Area under the CON phase of the net force-time curve |
CON Mean Force (N) | Average force of the CON phase |
CON Peak Force (N) | Peak force of the CON phase |
CON RFD (N•s-1) | The average change in force over time during the CON phase |
ECC Braking Impulse (N•s) | Area under the ECC braking phase of the net force-time curve |
ECC Braking RFD (N•s-1) | Average change in force over time during ECC braking time |
ECC:CON Mean Force Ratio (%) | Ratio of mean forces in the ECC and CON phases |
ECC Deceleration Impulse (N•s) | Area under the ECC deceleration phase of the net force-time curve |
ECC Deceleration RFD (N•s-1) | The average change in force over time during the ECC deceleration phase |
ECC Mean Braking Force (N) | Average force generated during the ECC braking phase |
ECC Mean Deceleration Force (N) | Average force generated during the ECC deceleration phase |
ECC Peak Force (N) | Peak force of the ECC phase |
Force at Zero Velocity (N) | Total force at the instance velocity is zero prior to take-off |
Unloading Impulse (N•s) | Net impulse from start of movement to start of deceleration phase |
Outcome Metrics (unit) | Definition |
Jump Height (cm) | Maximal jump height via impulse—momentum calculation |
RSI-modified (ratio) | Jump height divided by contraction time |
Note: RFD = rate of force development; ECC = eccentric; CON = concentric; RSI = reactive strength index