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

Table 3. Differences in countermovement jump metrics across the four time periods.

Strategy Metrics (unit) Pre-Season Non-Conference Conference Post-Season
Braking Phase Duration (s) 0.289 ± 0.042 0.271 ± 0.029 * 0.279 ± 0.034 0.273 ± 0.023
CON Phase Duration (s) 0.246 ± 0.031 0.234 ± 0.024 * 0.237 ± 0.030 0.238 ± 0.025
Countermovement Depth (cm) -31.9 ± 4.38 -30.2 ± 3.96 * -31.2 ± 4.43 -30.8 ± 3.88
ECC Deceleration Phase Duration (s) 0.165 ± 0.029 0.154 ± 0.022 * 0.156 ± 0.022 0.154 ± 0.018
ECC Peak Velocity (m•s-1) -1.35 ± 0.137 -1.36 ± 0.122 -1.38 ± 0.155 -1.37 ± 0.138
Driver Metrics (unit)
CON Impulse (N•s) 268 ± 32.7 268 ± 34.6 265 ± 32.9 264 ± 33.0
CON Mean Force (N) 2027 ± 182 2085 ± 214 * 2045 ± 183 2033 ± 222
CON Peak Force (N) 2459 ± 221 2545 ± 260 * 2519 ± 209 * 2504 ± 259 *
ECC Braking Impulse (N•s) 67.8 ± 14.1 68.6 ± 16.1 67.1 ± 14.5 68.4 ± 15.6
ECC Braking RFD (N•s-1) 7528 ± 1918 8330 ± 1669 * 8030 ± 1551 8043 ± 1424
ECC:CON Mean Force Ratio (%) 46.0 ± 4.13 45.0 ± 3.48 * 45.0 ± 4.55 45.3 ± 3.51
ECC Deceleration Impulse (N•s) 128 ± 24.4 131 ± 24.2 130 ± 24.5 129 ± 22.3
ECC Deceleration RFD (N•s-1) 8790 ± 3087 9873 ± 3341 * 9675 ± 2987 9426 ± 2200
ECC Mean Braking Force (N) 1173 ± 161 1194 ± 174 1164 ± 150 1172 ± 150 *
ECC Mean Deceleration Force (N) 1729 ± 229 1804 ± 240 * 1767 ± 200 * 1760 ± 214 *
ECC Peak Force (N) 2293 ± 259 2380 ± 282 2350 ± 237 * 2334 ± 281
Force at Zero Velocity (N) 2289 ± 260 2372 ± 282 2344 ± 236 2327 ± 285
Unloading Impulse (N•s) -129 ± 24.4 -131 ± 24.1 -130 ± 24.5 -129 ± 22.3
Outcome Metrics (unit)
Jump Height (cm) 41.5 ± 7.53 40.8 ± 6.40 41.7 ± 7.58 41.2 ± 7.45
RSI-modified (ratio) 0.62 ± 0.11 0.64 ± 0.10 0.65 ± 0.13 0.63 ± 0.11

*Note: “*” = significantly different from pre-season value