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. 2023 Sep 27;18(9):e0286581. doi: 10.1371/journal.pone.0286581

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