Appendix A - Intra-day reliability for countermovement jump variables on first day of preseason 1
Variable Mean ± SD CV ICC
Body Weight [kg] 97.4 ± 9.3 0.1 1.00
Braking Phase Duration [s] 0.360 ± 0.104 7.0 0.95
Braking Phase Duration:Concentric Duration 120.0 ± 46.5 8.1 0.95
Braking Phase Duration:Contraction Time 36.8 ± 9.3 13.4 0.78
CMJ Stiffness [N/m] 8,608 ± 4,666 13.0 0.92
Concentric Duration [ms] 309 ± 47 5.4 0.91
Concentric Impulse -100ms: Concentric Impulse 0.33 ± 0.10 11.5 0.90
Concentric Impulse [Ns] 298 ± 30 3.0 0.92
Concentric Impulse-100ms [Ns] 92.8 ± 27.2 11.3 0.89
Concentric Impulse-50ms [Ns] 46.3 ± 12.9 13.9 0.82
Concentric Maximum RFD [N/s] 8,286 ± 4,183 28.4 0.86
Concentric Mean Force [N] 1,932 ± 180 2.8 0.93
Concentric Mean Power [W] 3,037 ± 450 5.2 0.90
Concentric Peak Force [N] 2,520 ± 276 3.1 0.94
Concentric Peak Velocity [m/s] 3.18 ± 0.24 2.9 0.88
Concentric RFD [N/s] 3,096 ± 2,739 64.4 0.77
Concentric RPD - 100ms [W/s] 19,451 ± 9,901 18.1 0.91
Concentric RPD - 50ms [W/s] 18,311 ± 7,758 20.8 0.84
Concentric RPD [W/s] 27,678 ± 7,461 8.4 0.90
Concentric Time to Peak Force [ms] 208 ± 50 9.6 0.89
Contraction Time [ms] 984 ± 160 11.7 0.56
Contraction Time:Eccentric Duration [%] 148.6 ± 16.1 7.5 0.55
Countermovement Depth [cm] -34.6 ± 6.6 17.1 0.47
Eccentric Acceleration Phase Duration [s] 0.462 ± 0.146 30.3 0.33
Eccentric Braking Impulse [Ns] 68.8 ± 24.6 17.6 0.88
Eccentric Braking RFD [N/s] 4,623 ± 2,250 15.7 0.94
Eccentric Braking RFD-100ms [N/s] 4,109 ± 2,352 41.2 0.84
Eccentric Deceleration Impulse [Ns] 114 ± 32 10.3 0.92
Eccentric Deceleration Phase Duration [s] 0.214 ± 0.065 19.3 0.66
Eccentric Deceleration RFD [N/s] 5,037 ± 2,637 33.9 0.78
Eccentric Duration [ms] 642 ± 124 9.5 0.81
Eccentric Mean Braking Force [N] 1,158 ± 133 3.8 0.91
Eccentric Mean Deceleration Force [N] 1,514 ± 261 6.4 0.89
Eccentric Mean Force [N] 957 ± 92 0.1 1.00
Eccentric Mean Power [W] 502 ± 125 10.2 0.86
Eccentric Peak Force [N] 1,920 ± 316 6.3 0.88
Eccentric Peak Power [W] 1,456 ± 514 15.2 0.90
Eccentric Peak Power:Concentric Peak Power 0.23 ± 0.09 17.9 0.91
Eccentric Peak Velocity [m/s] -1.17 ± 0.32 10.1 0.92
Eccentric Unloading Impulse [Ns] -114 ± 32 10.1 0.92
Eccentric:Concentric Duration [%] 224.7 ± 65.8 23.1 0.58
Eccentric:Concentric Mean Force Ratio [%] 49.7 ± 4.7 2.8 0.94
Flight Time [ms] 628 ± 49 2.3 0.93
Flight Time:Contraction Time 0.65 ± 0.12 11.1 0.72
FlightTime:Eccentric Duration 0.98 ± 0.26 19.1 0.56
Force at Peak Power [N] 2,342 ± 257 3.2 0.93
Force at Zero Velocity [N] 1,897 ± 311 6.6 0.87
Jump Height (Flight Time) [cm] 48.6 ± 7.6 4.7 0.93
Jump Height (FT) Relative Landing RFD [N/s/cm] 2,421 ± 1,603 78.2 0.04
Jump Height (FT) Relative Peak Landing Force [N/cm] 115 ± 44 26.0 0.75
Jump Height (Imp-Dis) [cm] 48.5 ± 7.8 6.5 0.87
Jump Height (Imp-Mom) [cm] 48.4 ± 7.8 6.3 0.88
Landing Impulse [Ns] 129 ± 61 70.1 0.33
Landing RFD [N/s] 119,376 ± 89,444 82.6 0.03
Landing RFD 50ms [N/s] 76,970 ± 30,273 27.4 0.71
Lower-Limb Stiffness [N/m] 4,490 ± 1,637 19.1 0.77
Mean Eccentric+Concentric Power:Time [W/s] 1,396 ± 513 23.4 0.63
Mean Landing Power [W] 1,104 ± 207 13.9 0.56
Minimum Eccentric Force [N] 415 ± 203 24.1 0.91
Movement Start to Peak Force [s] 0.883 ± 0.160 13.1 0.56
Movement Start to Peak Power [s] 0.919 ± 0.158 12.6 0.55
P1 Concentric Impulse [Ns] 154 ± 40 6.3 0.95
P2 Concentric Impulse [Ns] 155 ± 33 6.3 0.93
P2 Concentric Impulse:P1 Concentric Impulse 1.23 ± 0.58 11.1 0.95
Peak Landing Acceleration [m/s2] 46.5 ± 25.1 34.8 0.57
Peak Landing Force [N] 5,478 ± 2,328 28.3 0.61
Peak Landing Power [W] 13,356 ± 5,816 31.9 0.39
Peak Landing Velocity [m/s] 0.84 ± 0.36 25.1 0.87
Peak Power [W] 6,528 ± 930 4.2 0.93
Peak Takeoff Acceleration [m/s2] 16.2 ± 2.9 5.1 0.92
Positive Impulse [Ns] 789 ± 105 10.6 0.54
Positive Takeoff Impulse [Ns] 448 ± 114 2.8 0.99
RSI-modified [m/s] 0.51 ± 0.11 10.8 0.84
Start of Braking Phase [s] 14.5 ± 4.6 22.9 0.74
Start of Concentric Phase [s] 14.8 ± 4.6 21.6 0.75
Start of Eccentric Deceleration Phase [s] 14.6 ± 4.6 22.4 0.74
Start of Integration [s] 16.5 ± 9.1 20.6 0.88
Start of Movement [s] 14.2 ± 4.6 23.6 0.74
Start of Movement Detection Threshold [N] 18.1 ± 2.8 19.8 0.35
Takeoff Peak Force [N] 2,520 ± 276 3.1 0.94
Time to Braking Phase [s] 0.315 ± 0.150 45.9 0.40
Total Work [J] 1,262 ± 137 4.4 0.86
Velocity at Peak Power [m/s] 2.78 ± 0.21 3.6 0.81
Vertical Velocity at Takeoff [m/s] 3.32 ± 0.94 2.7 0.99
Abbreviations: CMJ, countermovement jump; CV, coefficient of variation; FT, flight time; FT:CT, flight time to contraction time ratio;
2
ICC, intra-class correlation coefficient; Imp-Dis, impulse-distance; Imp-Mom, impulse-momentum; JH, jump height; RFD, rate of force 3
development; RPD, rate of power development; RSI, reactive strength index; SD, standard deviation.
4
Appendix B – Inter-day reliability for countermovement jump variables using Mean
3across 3 consecutive preseason days 5
CV ICC
Variable Mean ± SD 3 Day Day 1-2 Day 2-3 Day 1-3 3 Day Day 1-2 Day 2-3 Day 1-3
Body Weight [kg] 96.8 ± 9.4 0.8 0.7 0.7 1.0 0.99 1.00 1.00 0.99
Braking Phase Duration [s] 0.363 ± 0.083 9.1 8.4 8.9 9.9 0.88 0.91 0.86 0.87
Braking Phase Duration:Concentric Duration 115.3 ± 33.4 12.4 13.8 9.7 13.3 0.80 0.75 0.80 0.82
Braking Phase Duration:Contraction Time 37.2 ± 6.6 12.3 11.4 10.0 14.9 0.62 0.68 0.61 0.56
CMJ Stiffness [N/m] 8,074 ± 1,799 9.3 10.0 7.1 10.5 0.85 0.84 0.90 0.82
Concentric Duration [ms] 314 ± 45 5.3 7.2 3.8 4.5 0.89 0.81 0.94 0.93
Concentric Impulse -100ms: Concentric Impulse 0.30 ± 0.09 14.2 18.3 10.0 13.5 0.86 0.77 0.94 0.87
Concentric Impulse [Ns] 293 ± 28 3.6 2.6 3.3 4.5 0.89 0.93 0.90 0.83
Concentric Impulse-100ms [Ns] 88.3 ± 27.1 14.7 18.4 10.5 14.2 0.85 0.74 0.93 0.84
Concentric Impulse-50ms [Ns] 44.2 ± 13.9 13.9 16.0 10.2 14.8 0.87 0.81 0.94 0.83
Concentric Maximum RFD [N/s] 8,776 ± 5,303 23.1 16.4 24.1 27.5 0.89 0.95 0.88 0.83
Concentric Mean Force [N] 1,894 ± 175 3.3 3.9 2.6 3.2 0.90 0.84 0.94 0.91
Concentric Mean Power [W] 2,929 ± 410 6.5 6.7 5.7 7.0 0.82 0.81 0.87 0.79
Concentric Peak Force [N] 2,521 ± 288 3.7 3.1 2.5 5.0 0.92 0.93 0.96 0.85
Concentric Peak Velocity [m/s] 3.15 ± 0.21 3.6 2.8 3.2 4.4 0.77 0.86 0.80 0.65
Concentric RFD [N/s] 3,159 ± 2,256 31.6 24.3 31.9 37.7 0.89 0.93 0.88 0.87
Concentric RPD - 100ms [W/s] 17,947 ± 8,416 22.6 29.7 14.6 21.6 0.85 0.75 0.94 0.86
Concentric RPD - 50ms [W/s] 17,238 ± 7,673 20.5 23.9 14.0 22.6 0.86 0.81 0.94 0.82
Concentric RPD [W/s] 26,601 ± 5,565 8.5 9.7 6.7 8.9 0.84 0.80 0.88 0.85
Concentric Time to Peak Force [ms] 214 ± 48 11.8 15.0 6.1 12.6 0.79 0.65 0.95 0.75
Contraction Time [ms] 961 ± 136 6.7 5.7 5.5 8.6 0.81 0.87 0.88 0.64
Contraction Time:Eccentric Duration [%] 151.1 ± 12.3 3.1 2.4 2.9 4.0 0.88 0.93 0.89 0.82
Countermovement Depth [cm] 32.5 ± 4.7 6.5 7.4 6.0 6.0 0.85 0.81 0.87 0.88
Eccentric Acceleration Phase Duration [s] 0.433 ± 0.100 13.9 9.2 13.1 18.2 0.73 0.88 0.77 0.51
Eccentric Braking Impulse [Ns] 60.7 ± 16.8 14.4 15.4 14.4 13.4 0.86 0.83 0.84 0.89
Eccentric Braking RFD [N/s] 4,476 ± 2,148 13.5 9.4 14.5 15.7 0.96 0.98 0.95 0.94
Eccentric Braking RFD-100ms [N/s] 3,749 ± 1,813 31.6 30.4 31.1 33.2 0.85 0.85 0.83 0.86
Eccentric Deceleration Impulse [Ns] 104 ± 28 7.7 8.2 7.2 7.7 0.95 0.94 0.96 0.95
Eccentric Deceleration Phase Duration [s] 0.214 ± 0.057 7.2 8.3 6.8 6.3 0.94 0.92 0.94 0.96
Eccentric Deceleration RFD [N/s] 4,830 ± 2,555 18.5 18.2 10.8 24.5 0.93 0.92 0.98 0.88
Eccentric Duration [ms] 648 ± 123 9.5 9.5 8.5 12.4 0.81 0.81 0.85 0.65
Eccentric Mean Braking Force [N] 1,139 ± 127 3.0 2.9 2.4 3.6 0.94 0.94 0.96 0.92
Eccentric Mean Deceleration Force [N] 1,492 ± 262 3.8 4.3 3.0 4.1 0.96 0.95 0.98 0.96
Eccentric Mean Force [N] 950 ± 92 0.8 0.7 0.7 1.0 0.99 1.00 1.00 0.99
Eccentric Mean Power [W] 493 ± 125 9.0 7.2 9.8 9.7 0.91 0.93 0.90 0.89
Eccentric Peak Force [N] 1,867 ± 348 5.0 5.0 4.1 5.7 0.94 0.94 0.97 0.92
Eccentric Peak Power [W] 1,333 ± 477 10.5 11.1 10.0 10.4 0.95 0.94 0.96 0.95
Eccentric Peak Power:Concentric Peak Power 0.21 ± 0.08 12.1 13.2 10.2 12.7 0.95 0.94 0.96 0.95
Eccentric Peak Velocity [m/s] -1.08 ± 0.26 7.7 7.9 7.8 7.3 0.94 0.94 0.95 0.95
Eccentric Unloading Impulse [Ns] -104 ± 28 7.8 8.2 7.2 7.8 0.95 0.94 0.96 0.95
Eccentric:Concentric Duration [%] 211.1 ± 48.9 10.3 7.5 10.3 12.5 0.85 0.92 0.84 0.80
Eccentric:Concentric Mean Force Ratio [%] 50.4 ± 4.2 3.3 4.0 2.5 3.3 0.88 0.84 0.92 0.89
Flight Time [ms] 614 ± 48 3.9 2.8 3.9 4.8 0.79 0.90 0.79 0.68
Flight Time:Contraction Time 0.66 ± 0.10 8.6 6.8 8.2 10.4 0.78 0.88 0.79 0.60
FlightTime:Eccentric Duration 1.00 ± 0.20 10.8 7.5 10.0 14.0 0.78 0.91 0.80 0.60
Force at Peak Power [N] 2,335 ± 261 2.8 2.4 2.2 3.7 0.95 0.96 0.97 0.91
Force at Zero Velocity [N] 1,848 ± 344 5.1 5.1 4.2 6.0 0.94 0.93 0.96 0.91
Jump Height (Flight Time) [cm] 46.6 ± 7.2 8.0 5.6 8.0 9.8 0.79 0.90 0.79 0.68
Jump Height (FT) Relative Landing RFD [N/s/cm] 2,210 ± 962 35.5 50.5 21.5 30.7 0.63 0.27 0.88 0.64
Jump Height (FT) Relative Peak Landing Force [N/cm] 116 ± 40 14.7 16.9 9.8 16.5 0.90 0.87 0.96 0.88
Jump Height (Imp-Dis) [cm] 47.5 ± 7.0 7.8 6.1 7.0 9.7 0.78 0.86 0.81 0.66
Jump Height (Imp-Mom) [cm] 47.4 ± 7.0 7.8 6.1 7.2 9.8 0.77 0.86 0.80 0.66
Landing Impulse [Ns] 126 ± 33 25.8 29.3 28.7 18.4 0.29 0.11 0.03 0.67
Landing RFD [N/s] 102,223 ± 49,532 34.1 47.9 23.3 28.1 0.61 0.26 0.83 0.70
Landing RFD 50ms [N/s] 74,571 ± 23,532 17.4 15.0 20.9 15.8 0.80 0.83 0.72 0.84
Lower-Limb Stiffness [N/m] 4,519 ± 1,455 11.0 10.6 8.2 13.5 0.92 0.92 0.96 0.87
Mean Eccentric+Concentric Power:Time [W/s] 1,417 ± 422 13.9 10.8 12.9 17.4 0.83 0.91 0.86 0.71
Mean Landing Power [W] 1,066 ± 171 8.0 7.0 6.2 10.3 0.81 0.84 0.89 0.67
Minimum Eccentric Force [N] 413 ± 198 24.4 25.3 29.8 16.7 0.88 0.87 0.81 0.95
Movement Start to Peak Force [s] 0.846 ± 0.154 9.1 9.1 7.7 10.3 0.80 0.80 0.88 0.69
Movement Start to Peak Power [s] 0.895 ± 0.135 7.2 6.1 5.8 9.2 0.81 0.87 0.89 0.64
P1 Concentric Impulse [Ns] 138 ± 28 8.3 9.4 6.2 9.1 0.89 0.83 0.95 0.85
P2 Concentric Impulse [Ns] 155 ± 35 7.1 6.8 5.2 8.8 0.92 0.92 0.96 0.88
P2 Concentric Impulse:P1 Concentric Impulse 1.22 ± 0.58 14.6 16.3 10.7 16.1 0.90 0.87 0.96 0.87
Peak Landing Acceleration [m/s2] 44.6 ± 18.5 14.0 15.9 11.2 14.6 0.90 0.87 0.94 0.90
Peak Landing Force [N] 5,256 ± 1,722 11.2 13.1 9.0 11.1 0.91 0.88 0.94 0.92
Peak Landing Power [W] 12,065 ± 3,783 12.5 14.9 11.6 10.6 0.84 0.76 0.86 0.90
Peak Landing Velocity [m/s] 0.86 ± 0.29 26.3 30.4 20.5 27.4 0.70 0.68 0.73 0.72
Peak Power [W] 6,423 ± 833 5.5 4.1 4.4 7.3 0.86 0.91 0.90 0.77
Peak Takeoff Acceleration [m/s2] 16.3 ± 2.7 6.0 5.1 3.7 8.4 0.88 0.91 0.95 0.78
Positive Impulse [Ns] 774 ± 92 5.2 4.7 4.1 6.5 0.83 0.85 0.90 0.74
Positive Takeoff Impulse [Ns] 408 ± 44 3.0 2.6 3.2 3.3 0.93 0.94 0.93 0.92
RSI-modified [m/s] 0.50 ± 0.10 11.7 8.6 11.9 14.1 0.76 0.89 0.75 0.61
Start of Braking Phase [s] 11.8 ± 3.4 28.3 27.7 21.6 34.6 0.33 0.29 0.62 0.10
Start of Concentric Phase [s] 12.2 ± 3.4 27.1 26.8 20.4 33.1 0.34 0.30 0.63 0.11
Start of Eccentric Deceleration Phase [s] 11.9 ± 3.4 27.9 27.4 21.2 34.1 0.34 0.29 0.62 0.10
Start of Integration [s] 11.7 ± 3.5 29.0 26.8 22.7 36.4 0.38 0.42 0.61 0.14
Start of Movement [s] 11.5 ± 3.4 29.7 28.6 22.8 36.8 0.32 0.29 0.61 0.06
Start of Movement Detection Threshold [N] 17.9 ± 1.9 6.8 2.1 8.1 8.4 0.73 0.98 0.52 0.55
Takeoff Peak Force [N] 2,523 ± 288 3.7 3.1 2.5 4.9 0.92 0.93 0.96 0.85
Time to Braking Phase [s] 0.291 ± 0.101 28.6 24.7 23.0 36.7 0.53 0.63 0.70 0.26
Total Work [J] 1,221 ± 133 3.9 3.6 3.6 4.5 0.89 0.90 0.92 0.87
Velocity at Peak Power [m/s] 2.75 ± 0.19 3.6 3.1 3.3 4.2 0.78 0.85 0.81 0.69
Vertical Velocity at Takeoff [m/s] 3.03 ± 0.22 3.6 2.9 3.4 4.3 0.80 0.87 0.82 0.72
Abbreviations: CMJ, countermovement jump; CV, coefficient of variation; FT, flight time; FT:CT, flight time to contraction time ratio;
6
ICC, intra-class correlation coefficient; Imp-Dis, impulse-distance; Imp-Mom, impulse-momentum; JH, jump height; RFD, rate of force 7
development; RPD, rate of power development; RSI, reactive strength index; SD, standard deviation. Mean SD represents the mean 8
and standard deviation across the 3 training days.
9
Appendix C - Inter-day reliability for countermovement jump variables using Best
JHacross 3 consecutive preseason days 10
CV ICC
Variable Mean ± SD 3 Day Day 1-2 Day 2-3 Day 1-3 3 Day Day 1-2 Day 2-3 Day 1-3
Body Weight [kg] 96.8 ± 9.4 0.8 0.7 0.7 1.0 0.99 1.00 1.00 0.99
Braking Phase Duration [s] 0.359 ± 0.100 14.9 8.3 17.4 17.5 0.77 0.93 0.66 0.69
Braking Phase Duration:Concentric Duration 115.5 ± 33.4 15.2 10.7 15.9 18.1 0.74 0.87 0.65 0.69
Braking Phase Duration:Contraction Time 37.7 ± 8.1 18.4 12.0 21.1 20.9 0.44 0.74 0.21 0.38
CMJ Stiffness [N/m] 8,095 ± 2,709 18.7 18.4 15.2 22.1 0.68 0.71 0.71 0.63
Concentric Duration [ms] 313 ± 44 5.9 7.0 6.2 4.2 0.86 0.82 0.83 0.93
Concentric Impulse -100ms: Concentric Impulse 0.31 ± 0.10 22.4 25.7 21.4 19.9 0.72 0.59 0.78 0.76
Concentric Impulse [Ns] 298 ± 29 4.3 2.7 4.5 5.2 0.85 0.93 0.83 0.80
Concentric Impulse-100ms [Ns] 89.6 ± 28.2 20.6 20.2 23.6 17.8 0.73 0.69 0.72 0.79
Concentric Impulse-50ms [Ns] 45.2 ± 14.6 19.3 17.4 22.2 18.2 0.78 0.79 0.77 0.79
Concentric Maximum RFD [N/s] 8,663 ± 4,928 21.5 18.6 16.9 27.8 0.91 0.94 0.94 0.87
Concentric Mean Force [N] 1,906 ± 171 3.3 3.7 3.2 3.0 0.89 0.85 0.90 0.91
Concentric Mean Power [W] 2,993 ± 402 7.0 6.1 6.9 7.9 0.77 0.80 0.79 0.75
Concentric Peak Force [N] 2,511 ± 294 4.0 3.5 2.6 5.5 0.90 0.92 0.96 0.83
Concentric Peak Velocity [m/s] 3.20 ± 0.24 4.0 3.0 4.1 4.9 0.75 0.87 0.71 0.64
Concentric RFD [N/s] 2,976 ± 2136 92.9 75.6 83.4 119.9 0.53 0.61 0.46 0.51
Concentric RPD - 100ms [W/s] 18,107 ± 8577 30.2 32.1 33.9 23.9 0.76 0.69 0.74 0.85
Concentric RPD - 50ms [W/s] 17,722 ± 8422 28.5 27.3 32.8 25.1 0.78 0.77 0.76 0.81
Concentric RPD [W/s] 26,715 ± 5167 8.8 9.4 7.8 9.0 0.82 0.79 0.81 0.84
Concentric Time to Peak Force [ms] 218 ± 45 10.5 12.2 11.1 7.6 0.82 0.76 0.79 0.91
Contraction Time [ms] 954 ± 166 11.5 8.8 12.2 13.0 0.63 0.79 0.59 0.47
Contraction Time:Eccentric Duration [%] 152.0 ± 15.8 7.3 6.5 8.0 7.3 0.55 0.66 0.43 0.55
Countermovement Depth [cm] -33.2 ± 7.1 14.1 12.6 15.3 14.2 0.70 0.78 0.57 0.73
Eccentric Acceleration Phase Duration [s] 0.430 ± 0.143 27.7 24.4 29.5 28.9 0.44 0.57 0.41 0.32
Eccentric Braking Impulse [Ns] 64.1 ± 23.8 32.2 23.7 31.3 40.3 0.61 0.78 0.62 0.44
Eccentric Braking RFD [N/s] 4,600 ± 2,409 20.5 14.5 20.9 25.1 0.92 0.96 0.92 0.88
Eccentric Braking RFD-100ms [N/s] 3,811 ± 2,189 53.2 38.6 70.3 48.4 0.84 0.92 0.78 0.83
Eccentric Deceleration Impulse [Ns] 109 ± 31 14.8 16.8 7.3 18.2 0.85 0.80 0.96 0.77
Eccentric Deceleration Phase Duration [s] 0.211 ± 0.067 15.2 17.8 13.2 14.4 0.80 0.72 0.84 0.84
Eccentric Deceleration RFD [N/s] 5,019 ± 2,875 24.5 22.8 26.0 24.6 0.90 0.90 0.89 0.90
Eccentric Duration [ms] 641 ± 161 19.1 19.1 20.8 20.9 0.55 0.55 0.48 0.44
Eccentric Mean Braking Force [N] 1,140 ± 140 4.4 3.6 5.2 4.1 0.90 0.93 0.86 0.90
Eccentric Mean Deceleration Force [N] 1,507 ± 275 6.4 6.7 5.9 6.5 0.90 0.88 0.92 0.91
Eccentric Mean Force [N] 951 ± 92 0.8 0.7 0.7 1.0 0.99 1.00 1.00 0.99
Eccentric Mean Power [W] 504 ± 124 12.6 11.0 11.6 14.9 0.82 0.82 0.86 0.76
Eccentric Peak Force [N] 1,887 ± 357 6.4 5.2 7.0 6.8 0.91 0.93 0.91 0.90
Eccentric Peak Power [W] 1,403 ± 528 19.1 22.0 12.5 21.7 0.86 0.81 0.94 0.83
Eccentric Peak Power:Concentric Peak Power 0.22 ± 0.09 20.5 24.6 15.3 20.8 0.90 0.85 0.94 0.89
Eccentric Peak Velocity [m/s] -1.12 ± 0.30 14.9 16.8 7.9 18.2 0.83 0.79 0.95 0.75
Eccentric Unloading Impulse [Ns] -109 ± 31 14.9 16.9 7.5 18.3 0.84 0.80 0.96 0.77
Eccentric:Concentric Duration [%] 208.3 ± 58.8 22.6 19.4 25.4 22.9 0.55 0.68 0.39 0.55
Eccentric:Concentric Mean Force Ratio [%] 50.0 ± 4.1 3.4 3.8 3.2 3.0 0.87 0.85 0.86 0.90
Flight Time [ms] 625 ± 46 3.6 2.5 3.9 4.2 0.80 0.90 0.77 0.75
Flight Time:Contraction Time 0.67 ± 0.12 12.5 8.4 13.6 14.6 0.62 0.86 0.54 0.34
FlightTime:Eccentric Duration 1.03 ± 0.25 20.0 14.7 21.9 22.8 0.51 0.78 0.40 0.26
Force at Peak Power [N] 2,328 ± 273 3.3 3.3 2.1 4.2 0.94 0.93 0.98 0.90
Force at Zero Velocity [N] 1870 ± 350 6.6 5.0 7.1 7.3 0.91 0.93 0.91 0.88
Jump Height (Flight Time) [cm] 48.1 ± 7.2 7.3 5.1 7.9 8.5 0.80 0.90 0.77 0.75
Jump Height (FT) Relative Landing RFD [N/s/cm] 2,500 ± 1,327 56.8 73.4 34.3 59.4 0.33 -0.14 0.77 0.22
Jump Height (FT) Relative Peak Landing Force [N/cm] 118 ± 42 15.6 14.1 12.8 19.4 0.89 0.91 0.92 0.83
Jump Height (Imp-Dis) [cm] 49.0 ± 7.9 9.0 6.4 9.5 10.6 0.75 0.88 0.69 0.65
Jump Height (Imp-Mom) [cm] 48.9 ± 7.8 8.8 6.4 9.2 10.4 0.75 0.88 0.70 0.66
Landing Impulse [Ns] 124 ± 50 73.9 94.4 55.3 70.2 0.08 -0.23 -0.20 0.42
Landing RFD [N/s] 12,0975 ± 71,248 57.0 73.0 37.9 57.7 0.30 -0.07 0.66 0.29
Landing RFD 50ms [N/s] 83,366 ± 35,439 30.6 24.9 39.2 26.6 0.61 0.74 0.39 0.70
Lower-Limb Stiffness [N/m] 4,589 ± 1,705 20.8 13.3 22.3 25.4 0.79 0.90 0.77 0.70
Mean Eccentric+Concentric Power:Time [W/s] 1,467 ± 462 25.5 17.5 28.2 29.6 0.55 0.76 0.51 0.39
Mean Landing Power [W] 1,079 ± 203 8.8 5.7 10.4 9.7 0.83 0.92 0.79 0.81
Minimum Eccentric Force [N] 403 ± 209 29.8 26.7 30.6 31.9 0.85 0.88 0.81 0.84
Movement Start to Peak Force [s] 0.837 ± 0.190 19.5 11.8 21.3 23.7 0.49 0.74 0.51 0.28
Movement Start to Peak Power [s] 0.889 ± 0.166 12.4 9.6 13.2 14.0 0.63 0.78 0.59 0.48
P1 Concentric Impulse [Ns] 144 ± 34 17.7 17.8 12.7 21.6 0.60 0.47 0.81 0.47
P2 Concentric Impulse [Ns] 157 ± 38 7.4 7.2 7.5 7.4 0.93 0.93 0.93 0.93
P2 Concentric Impulse:P1 Concentric Impulse 1.26 ± 0.69 22.0 21.9 17.3 26.1 0.83 0.80 0.90 0.77
Peak Landing Acceleration [m/s2] 48.2 ± 22.6 20.0 16.4 19.5 23.5 0.83 0.88 0.83 0.79
Peak Landing Force [N] 5,593 ± 2,071 16.0 14.2 15.4 18.4 0.85 0.88 0.84 0.81
Peak Landing Power [W] 13,060 ± 4,793 20.6 22.3 20.0 19.5 0.66 0.60 0.66 0.72
Peak Landing Velocity [m/s] 0.86 ± 0.35 23.8 27.5 25.0 18.1 0.84 0.78 0.81 0.92
Peak Power [W] 6,518 ± 923 5.9 5.0 5.3 7.3 0.86 0.89 0.88 0.81
Peak Takeoff Acceleration [m/s2] 16.2 ± 2.7 6.8 5.9 4.5 9.3 0.85 0.88 0.94 0.75
Positive Impulse [Ns] 777 ± 107 11.6 14.2 3.6 14.1 0.48 0.34 0.92 0.39
Positive Takeoff Impulse [Ns] 424 ± 72 13.1 14.6 3.5 17.3 0.25 0.22 0.90 0.02
RSI-modified [m/s] 0.52 ± 0.11 14.5 8.7 15.9 17.6 0.67 0.90 0.58 0.40
Start of Braking Phase [s] 13.0 ± 6.1 70.5 58.5 81.7 70.5 -0.04 0.37 -0.19 -0.46
Start of Concentric Phase [s] 13.4 ± 6.1 67.1 55.6 77.1 67.9 -0.04 0.38 -0.19 -0.47
Start of Eccentric Deceleration Phase [s] 13.2 ± 6.1 69.3 57.4 80.2 69.5 -0.04 0.38 -0.19 -0.46
Start of Integration [s] 13.0 ± 7.0 79.5 62.8 87.6 87.1 -0.06 0.42 -0.21 -0.55
Start of Movement [s] 12.7 ± 6.1 75.0 61.1 87.6 75.6 -0.05 0.37 -0.21 -0.47
Start of Movement Detection Threshold [N] 18.2 ± 2.0 11.1 4.1 12.8 14.0 0.35 0.81 0.36 0.15
Takeoff Peak Force [N] 2,513 ± 295 4.0 3.5 2.5 5.4 0.91 0.92 0.96 0.84
Time to Braking Phase [s] 0.282 ± 0.140 50.4 41.6 58.6 50.2 0.27 0.40 0.16 0.29
Total Work [J] 1,250 ± 131 4.8 3.4 5.4 5.4 0.83 0.90 0.80 0.80
Velocity at Peak Power [m/s] 2.80 ± 0.21 4.3 3.2 4.5 5.1 0.71 0.85 0.68 0.57
Vertical Velocity at Takeoff [m/s] 3.16 ± 0.55 13.5 14.9 4.5 17.7 0.17 0.27 0.70 -0.06
Abbreviations: CMJ, countermovement jump; CV, coefficient of variation; FT, flight time; FT:CT, flight time to contraction time ratio;
11
ICC, intra-class correlation coefficient; Imp-Dis, impulse-distance; Imp-Mom, impulse-momentum; JH, jump height; RFD, rate of force 12
development; RPD, rate of power development; RSI, reactive strength index; SD, standard deviation. Mean SD represents the mean 13
and standard deviation across the 3 training days.
14
Appendix D - Inter-day reliability for countermovement jump variables using Best
FT:CTacross 3 consecutive preseason days 15
CV ICC
Variable Mean ± SD 3 Day Day 1-2 Day 2-3 Day 1-3 3 Day Day 1-2 Day 2-3 Day 1-3
Body Weight [kg] 96.8 ± 9.4 0.8 0.7 0.7 1.0 0.99 1.00 1.00 0.99
Braking Phase Duration [s] 0.350 ± 0.101 15.5 11.4 19.0 15.5 0.74 0.86 0.60 0.75
Braking Phase Duration:Concentric Duration 114.2 ± 41.6 19.6 16.8 20.2 21.5 0.66 0.75 0.47 0.69
Braking Phase Duration:Contraction Time 39.0 ± 8.0 16.1 12.0 18.8 16.7 0.52 0.67 0.29 0.59
CMJ Stiffness [N/m] 8,786 ± 3,560 22.8 27.1 11.8 26.9 0.55 0.50 0.73 0.54
Concentric Duration [ms] 313 ± 47 9.0 11.9 5.5 8.6 0.73 0.56 0.89 0.76
Concentric Impulse -100ms: Concentric Impulse 0.32 ± 0.11 26.9 37.9 18.0 22.2 0.61 0.33 0.83 0.68
Concentric Impulse [Ns] 297 ± 30 4.6 3.4 4.7 5.6 0.83 0.90 0.83 0.77
Concentric Impulse-100ms [Ns] 91.6 ± 31.0 24.2 33.2 18.2 19.1 0.64 0.41 0.80 0.74
Concentric Impulse-50ms [Ns] 45.9 ± 15.3 23.5 31.2 17.2 20.3 0.67 0.47 0.85 0.67
Concentric Maximum RFD [N/s] 8,703 ± 5,302 30.2 31.7 28.9 29.8 0.88 0.89 0.89 0.86
Concentric Mean Force [N] 1,908 ± 181 4.3 5.4 2.9 4.3 0.82 0.70 0.92 0.83
Concentric Mean Power [W] 2,997 ± 430 7.6 7.2 7.0 8.5 0.76 0.78 0.78 0.73
Concentric Peak Force [N] 2,518 ± 292 3.8 3.9 1.9 5.0 0.91 0.90 0.98 0.85
Concentric Peak Velocity [m/s] 3.19 ± 0.24 4.5 3.6 4.3 5.3 0.70 0.80 0.74 0.55
Concentric RFD [N/s] 3,002 ± 2,250 45.3 48.7 21.8 58.7 0.82 0.72 0.95 0.79
Concentric RPD - 100ms [W/s] 19,012 ± 10,270 39.2 55.5 27.3 31.5 0.64 0.41 0.80 0.75
Concentric RPD - 50ms [W/s] 18,356 ± 9,045 37.1 50.8 26.4 31.7 0.65 0.44 0.83 0.68
Concentric RPD [W/s] 27,033 ± 6,280 11.6 14.4 6.9 12.4 0.73 0.59 0.86 0.75
Concentric Time to Peak Force [ms] 210 ± 62 15.2 21.1 9.0 13.7 0.70 0.50 0.87 0.75
Contraction Time [ms] 894 ± 138 7.2 8.4 5.5 7.5 0.82 0.75 0.90 0.78
Contraction Time:Eccentric Duration [%] 156.4 ± 15.2 5.5 6.1 4.3 5.8 0.73 0.69 0.80 0.72
Countermovement Depth [cm] -30.9 ± 5.0 11.9 12.2 12.5 10.8 0.61 0.55 0.48 0.73
Eccentric Acceleration Phase Duration [s] 0.382 ± 0.118 19.2 22.4 13.0 21.1 0.68 0.61 0.84 0.60
Eccentric Braking Impulse [Ns] 59.9 ± 19.5 26.1 18.7 27.2 31.4 0.74 0.86 0.68 0.66
Eccentric Braking RFD [N/s] 4,778 ± 2,360 24.4 19.8 25.3 27.7 0.88 0.92 0.89 0.82
Eccentric Braking RFD-100ms [N/s] 3,905 ± 2,047 47.4 47.4 43.7 50.9 0.86 0.87 0.90 0.82
Eccentric Deceleration Impulse [Ns] 107 ± 28 13.7 15.0 8.4 16.6 0.84 0.81 0.95 0.75
Eccentric Deceleration Phase Duration [s] 0.199 ± 0.061 16.2 17.3 8.3 20.9 0.73 0.61 0.93 0.60
Eccentric Deceleration RFD [N/s] 5,331 ± 2,831 35.9 43.0 13.2 45.1 0.77 0.65 0.97 0.62
Eccentric Duration [ms] 581 ± 128 11.8 11.8 9.2 12.6 0.78 0.78 0.87 0.74
Eccentric Mean Braking Force [N] 1,138 ± 131 3.8 3.3 4.2 4.0 0.91 0.94 0.90 0.90
Eccentric Mean Deceleration Force [N] 1,525 ± 275 6.1 5.9 3.7 7.9 0.90 0.89 0.97 0.83
Eccentric Mean Force [N] 951 ± 92 0.8 0.7 0.7 0.9 0.99 1.00 1.00 0.99
Eccentric Mean Power [W] 522 ± 139 11.6 9.3 13.4 11.7 0.86 0.90 0.83 0.85
Eccentric Peak Force [N] 1,903 ± 359 7.9 9.1 5.1 8.9 0.86 0.79 0.95 0.78
Eccentric Peak Power [W] 1,405 ± 511 17.9 19.6 11.1 21.6 0.86 0.83 0.95 0.78
Eccentric Peak Power:Concentric Peak Power 0.22 ± 0.09 18.5 22.4 13.9 18.6 0.90 0.85 0.95 0.89
Eccentric Peak Velocity [m/s] -1.11 ± 0.28 13.8 15.0 8.8 16.5 0.83 0.80 0.94 0.73
Eccentric Unloading Impulse [Ns] -107 ± 29 13.8 15.2 8.4 16.6 0.84 0.81 0.95 0.75
Eccentric:Concentric Duration [%] 190.3 ± 53.5 16.5 19.4 12.4 17.1 0.72 0.66 0.80 0.74
Eccentric:Concentric Mean Force Ratio [%] 50.0 ± 4.3 4.3 5.4 2.9 4.3 0.81 0.73 0.89 0.83
Flight Time [ms] 617 ± 50 4.0 2.7 4.0 5.1 0.80 0.92 0.78 0.69
Flight Time:Contraction Time 0.70 ± 0.11 9.5 8.8 8.6 11.0 0.74 0.81 0.80 0.59
FlightTime:Eccentric Duration 1.11 ± 0.25 13.8 13.2 12.2 15.9 0.71 0.76 0.77 0.56
Force at Peak Power [N] 2,333 ± 274 3.1 3.2 2.0 3.8 0.95 0.94 0.98 0.92
Force at Zero Velocity [N] 1,884 ± 355 8.1 9.2 5.6 9.0 0.85 0.79 0.94 0.78
Jump Height (Flight Time) [cm] 46.9 ± 7.6 8.2 5.4 8.1 10.4 0.80 0.92 0.78 0.69
Jump Height (FT) Relative Landing RFD [N/s/cm] 2,119 ± 1120 57.6 68.5 27.2 71.4 0.38 0.10 0.86 0.08
Jump Height (FT) Relative Peak Landing Force [N/cm] 113 ± 42 23.0 29.7 10.1 25.6 0.78 0.65 0.95 0.75
Jump Height (Imp-Dis) [cm] 48.8 ± 7.8 10.0 8.1 9.7 12.0 0.69 0.80 0.73 0.53
Jump Height (Imp-Mom) [cm] 48.6 ± 7.8 9.7 7.6 9.5 11.7 0.71 0.83 0.73 0.56
Landing Impulse [Ns] 133 ± 47 68.4 63.7 49.1 90.0 -0.06 0.07 0.01 -0.18
Landing RFD [N/s] 99,346 ± 61,798 57.7 69.1 29.5 69.8 0.35 0.13 0.79 0.14
Landing RFD 50ms [N/s] 78,488 ± 33,744 32.6 30.2 25.7 40.6 0.60 0.69 0.69 0.44
Lower-Limb Stiffness [N/m] 4,948 ± 1,689 17.5 19.7 14.4 18.1 0.82 0.76 0.89 0.79
Mean Eccentric+Concentric Power:Time [W/s] 1,627 ± 518 16.6 15.3 15.9 18.4 0.79 0.83 0.81 0.73
Mean Landing Power [W] 1,069 ± 214 13.2 11.5 11.8 15.9 0.68 0.77 0.75 0.51
Minimum Eccentric Force [N] 390 ± 212 30.3 23.3 38.2 28.3 0.85 0.91 0.75 0.87
Movement Start to Peak Force [s] 0.769 ± 0.172 11.9 12.8 6.7 14.9 0.81 0.73 0.96 0.65
Movement Start to Peak Power [s] 0.828 ± 0.139 7.7 8.9 5.8 8.0 0.82 0.76 0.91 0.78
P1 Concentric Impulse [Ns] 145 ± 36 16.9 20.4 8.6 19.6 0.63 0.51 0.89 0.51
P2 Concentric Impulse [Ns] 156 ± 38 10.4 12.9 7.0 10.7 0.86 0.78 0.94 0.84
P2 Concentric Impulse:P1 Concentric Impulse 1.23 ± 0.61 23.5 30.4 12.5 25.0 0.81 0.70 0.94 0.77
Peak Landing Acceleration [m/s2] 44.1 ± 21.8 25.6 34.6 15.0 24.4 0.75 0.56 0.90 0.79
Peak Landing Force [N] 5,189 ± 1,980 20.5 27.9 11.6 19.5 0.76 0.57 0.91 0.80
Peak Landing Power [W] 11,756 ± 4,503 22.7 30.5 13.5 21.6 0.60 0.37 0.80 0.68
Peak Landing Velocity [m/s] 0.90 ± 0.41 54.3 53.7 53.6 55.6 0.44 0.44 0.41 0.46
Peak Power [W] 6,506 ± 887 6.2 5.7 4.7 7.8 0.83 0.84 0.91 0.75
Peak Takeoff Acceleration [m/s2] 16.3 ± 2.7 6.3 6.5 3.0 8.4 0.87 0.86 0.97 0.77
Positive Impulse [Ns] 774 ± 115 10.9 13.9 5.0 12.0 0.60 0.44 0.87 0.59
Positive Takeoff Impulse [Ns] 424 ± 76 13.7 15.3 3.4 18.3 0.26 0.26 0.91 -0.02
RSI-modified [m/s] 0.54 ± 0.11 12.9 9.9 12.8 15.6 0.73 0.87 0.72 0.54
Start of Braking Phase [s] 12.9 ± 6.1 84.7 118.7 69.6 62.9 0.07 -0.14 0.26 0.21
Start of Concentric Phase [s] 13.2 ± 6.1 79.6 111.2 64.8 59.9 0.07 -0.14 0.28 0.20
Start of Eccentric Deceleration Phase [s] 13.0 ± 6.1 82.5 115.3 67.6 61.7 0.07 -0.13 0.27 0.20
Start of Integration [s] 14.0 ± 8.4 101.3 136.1 65.9 99.1 -0.21 -0.35 0.23 -0.39
Start of Movement [s] 12.7 ± 6.1 89.6 125.6 74.2 66.1 0.06 -0.13 0.25 0.19
Start of Movement Detection Threshold [N] 17.0 ± 3.7 19.7 15.3 28.2 13.0 0.80 0.91 0.63 0.82
Takeoff Peak Force [N] 2,520 ± 293 3.8 3.8 2.0 5.0 0.92 0.91 0.98 0.85
Time to Braking Phase [s] 0.231 ± 0.100 32.5 37.1 31.0 29.2 0.57 0.40 0.61 0.67
Total Work [J] 1,225 ± 139 6.2 5.3 6.7 6.6 0.75 0.80 0.72 0.73
Velocity at Peak Power [m/s] 2.79 ± 0.22 4.7 3.7 4.7 5.5 0.69 0.82 0.70 0.54
Vertical Velocity at Takeoff [m/s] 3.17 ± 0.62 15.2 16.9 4.3 20.1 0.10 0.19 0.76 -0.13
