Table 2.
Seasonal changes in unloaded and loaded countermovement jump kinetics.
| Percentage changes (d z ) | |||||||
|---|---|---|---|---|---|---|---|
| Variables | NC1 | NC2 | C1 | C2 | NC1-NC2 | NC1-C1 | NC1-C2 |
| CMJ0 | |||||||
| BW | 62.2 ± 5.9 | 62.5 ± 6.1 | 62.5 ± 6.3 | 61.7 ± 5.7 | 0.2 ± 1.4 (ES = 0.29) | 0.3 ± 1.5 (ES = 0.24) | 0.7 ± 3.2 (ES = 0.26) |
| JH (cm) | 24.8 ± 3.4 | 26.1 ± 3.5 | 28.2 ± 4.5* | 28.1 ± 4.9* | 8.3 ± 8.0 (ES = 0.73) | 14.1 ± 11.4 (ES = 0.89) | 13.3 ± 9.6 (ES = 0.85) |
| RSI (m·s−1) | 0.28 ± 0.04 | 0.30 ± 0.07 | 0.36 ± 0.06*§ | 0.34 ± 0.06 | 22.1 ± 15.1 (ES = 0.18) | 26.6 ± 21.1 (ES = 1.44) | 20.8 ± 29.8 (ES = 0.72) |
| PF (N) | 734.1 ± 76.2 | 779.7 ± 152.8 | 829.7 ± 101.4 | 743.1 ± 78.6 | 7.6 ± 10.9 (ES = 0.46) | 13.4 ± 11.5 (ES = 1.22) | 1.9 ± 12.9 (ES = 0.11) |
| RPF (N·kg−1) | 11.9 ± 1.4 | 12.6 ± 2.8 | 13.5 ± 2.5 | 12.1 ± 1.5 | 7.8 ± 11.2 (ES = 0.45) | 13.1 ± 12.2 (ES = 1.10) | 2.6 ± 13.1 (ES = 0.18) |
| EI (N·s−1) | 73.5 ± 11.8 | 73.6 ± 11.2 | 77.5 ± 11.5 | 77.7 ± 9.7 | 5.6 ± 6.4 (ES = 0.03) | 6.2 ± 13.3 (ES = 0.47) | 6.8 ± 13.3 (ES = 0.53) |
| CI (N·s−1) | 139.7 ± 12.5 | 143.8 ± 14.0 | 148.7 ± 13.0 | 145.1 ± 9.7 | 3.6 ± 5.2 (ES = 0.54) | 6.6 ± 6.8 (ES = 1.03) | 4.0 ± 7.4 (ES = 0.56) |
| PP (W) | 2511.7 ± 162.9 | 2637.3 ± 171.0* | 2769.4 ± 255.6* | 2752.3 ± 238.1* | 5.2 ± 5.4 (ES = 1.30) | 10.3 ± 8.2 (ES = 1.32) | 9.6 ± 6.5 (ES = 1.57) |
| RPP (W·kg−1) | 40.6 ± 3.9 | 42.4 ± 3.7 | 44.5 ± 5.5* | 44.8 ± 4.8 | 5.0 ± 5.4 (ES = 0.98) | 9.6 ± 8.6 (ES = 1.23) | 10.4 ± 6.6 (ES = 1.74) |
| EAP (W) | 345.7 ± 91.0 | 330.1 ± 97.4 | 370.2 ± 65.3 | 353.5 ± 55.0 | 13.6 ± 17.2 (ES = 0.20) | 11.4 ± 25.7 (ES = 0.39) | 8.3 ± 35.1 (ES = 0.11) |
| CAP (W) | 1308.3 ± 126.2 | 1378.5 ± 155.2 | 1462.8 ± 155.8*§ | 1412.0 ± 132.2 | 6.6 ± 5.9 (ES = 0.91) | 12.0 ± 7.8 (ES = 1.64) | 8.3 ± 9.2 (ES = 1.04) |
| CMJ20 | |||||||
| JH (cm) | 16.4 ± 2.1 | 17.0 ± 2.0 | 18.5 ± 2.1 | 18.5 ± 2.7* | 5.5 ± 13.1 (ES = 0.61) | 14.2 ± 18.0 (ES = 0.81) | 13.3 ± 10.7 (ES = 0.85) |
| RSI (m·s−1) | 0.18 ± 0.03 | 0.18 ± 0.04 | 0.21 ± 0.04 | 0.19 ± 0.03 | 12.3 ± 11.0 (ES = 0.13) | 14.3 ± 18.4 (ES = 0.85) | 8.9 ± 23.3 (ES = 0.34) |
| PF (N) | 684.3 ± 83.3 | 714.1 ± 132.6 | 798.2 ± 130.1 | 702.5 ± 50.4 | 13.2 ± 17.3(ES = 0.38) | 17.3 ± 18.2 (ES = 0.77) | 3.8 ± 13.1 (ES = 0.14) |
| RPF (N·kg−1) | 8.4 ± 1.1 | 8.7 ± 1.8 | 9.8 ± 2.1 | 8.7 ± 0.9 | 13.4 ± 17.9 (ES = 0.36) | 17.1 ± 18.7 (ES = 0.96) | 4.6 ± 13.2 (ES = 0.33) |
| EI (N·s−1) | 86.5 ± 11.6 | 88.9 ± 11.8 | 89.5 ± 9.9 | 90.2 ± 9.3 | 0.9 ± 6.5 (ES = 0.35) | 4.1 ± 8.0 (ES = 0.59) | 5.6 ± 15.6 (ES = 0.38) |
| CI (N·s−1) | 150.3 ± 18.3 | 157.7 ± 17.4* | 160.5 ± 13.1 | 156.3 ± 14.4 | 2.4 ± 6.6 (ES = 1.54) | 7.5 ± 9.3 (ES = 0.79) | 4.3 ± 5.5 (ES = 0.74) |
| PP (W) | 2,483.1 ± 185.9 | 2,596.7 ± 188.8 | 2,696.4 ± 232.5 | 2,667.8 ± 173.4* | 4.3 ± 7.5 (ES = 1.14) | 8.9 ± 10.4 (ES = 0.92) | 7.7 ± 6.2 (ES = 1.37) |
| RPP (W·kg−1) | 30.4 ± 2.5 | 31.7 ± 2.1 | 32.9 ± 2.9 | 33.0 ± 2.5* | 4.3 ± 8.1 (ES = 0.91) | 8.6 ± 11.2 (ES = 0.84) | 8.5 ± 6.6 (ES = 1.49) |
| EAP (W) | 463.6 ± 92.2 | 446.9 ± 118.1 | 467.5 ± 100.1 | 441.6 ± 77.6 | 5.1 ± 14.7 (ES = 0.31) | 0.8 ± 8.0 (ES = 0.11) | 3.8 ± 11.8 (ES = 0.50) |
| CAP (W) | 1,215.4 ± 153.5 | 1,275.6 ± 180.5 | 1,332.8 ± 198.1 | 1,286.8 ± 124.5 | 4.9 ± 7.6 (ES = 0.65) | 9.9 ± 10.7 (ES = 0.92) | 6.6 ± 9.8 (ES = 0.73) |
dz, Cohen's dz effect size; NC1, 1st non-conference match-play; NC2, 7th non-conference match-play; C1, 1st conference match-play; C2, 6th conference match-play; CMJ0, countermovement jump with a polyvinyl chloride pipe; CMJ20, countermovement jump with a 20-kg barbell; BW, body weight; JH, jump height; RSI, modified reactive strength index; PF, peak force; RPF, relative PF; EI, eccentric impulse; CI, concentric impulse; PP, peak power; RPP, relative PP; EAP, eccentric average power; CAP, concentric average power.
*
denotes p ≤ 0.05 from NC1 and
§
denotes p ≤ 0.05 from NC2.