Table 2. Means ± SD and statistical comparison between ROL, RAL and ELITE.
| Variable |
ROL |
RAL |
ROL vs. RAL |
ELITE |
vs. ROL |
vs. RAL |
| t |
P |
d |
t |
P |
d |
t |
P |
d |
| Jump Height (cm) |
14.3 ± 8.2 |
19.4 ± 7.8 |
-2.22 |
0.053 |
-0.70 |
30.6 ± 9.8 |
-4.03 |
0.001* |
-1.80 |
-2.83 |
0.011* |
-1.27 |
| Contact Time (ms) |
460 ± 130 |
470 ± 120 |
-0.45 |
0.665 |
-0.14 |
368 ± 48 |
2.07 |
0.062 |
0.93 |
2.35 |
0.038 |
1.05 |
| Average Forward Vel (m/s) |
3.9 ± 0.7 |
4.0 ± 0.9 |
-0.24 |
0.816 |
-0.08 |
4.9 ± 0.4 |
-3.35 |
0.004* |
-1.75 |
-2.53 |
0.026 |
-1.29 |
| Peak vGRF (N/kg) |
19.8 ± 3.4 |
26.9 ± 4.6 |
-6.13 |
<0.001* |
-1.94 |
34.2 ± 6.6 |
-6.12 |
<0.001* |
-2.74 |
-2.86 |
0.010* |
-1.28 |
| Peak tGRF (N/kg) |
10.9 ± 2.6 |
13.4 ± 2.9 |
-4.29 |
0.002* |
-1.35 |
17.9 ± 2.3 |
-6.41 |
<0.001* |
-2.87 |
-3.84 |
0.001* |
-1.72 |
| Peak hGRF (N/kg) |
1.5 ± 0.8 |
6.8 ± 2.3 |
-8.00 |
<0.001* |
-2.53 |
8.1 ± 3.6 |
-5.53 |
<0.001* |
-2.47 |
-0.94 |
0.362 |
-0.42 |
| Ext. Foot Pos (°) |
-22 ± 21 |
-78 ± 10 |
7.39 |
<0.001* |
2.34 |
-82 ± 4 |
8.86 |
<0.001* |
3.96 |
1.25 |
0.236 |
0.56 |
| Ankle Angle at IC (°) |
-16 ± 13 |
-22 ± 9 |
2.16 |
0.059 |
0.68 |
-17 ± 9 |
0.31 |
0.760 |
0.14 |
-1.11 |
0.281 |
-0.50 |
| Peak Ankle Angle (°) |
38 ± 9 |
36 ± 7 |
1.38 |
0.200 |
0.44 |
34 ± 7 |
1.16 |
0.261 |
0.52 |
0.45 |
0.659 |
0.20 |
| Peak MAnkle (Nm/kg) |
3.1 ± 0.5 |
2.5 ± 0.4 |
2.88 |
0.018 |
0.91 |
2.9 ± 0.3 |
1.22 |
0.237 |
0.55 |
-2.24 |
0.038 |
-1.00 |
| Peak ATMA (mm) |
47.9 ± 8.9 |
51.5 ± 9.0 |
-1.81 |
0.103 |
-0.57 |
52.4 ± 8.5 |
-1.16 |
0.262 |
-0.52 |
-0.24 |
0.813 |
-0.11 |
| Peak AT Force (N) |
5278 ± 1227 |
3960 ± 1181 |
4.10 |
0.003* |
1.30 |
4007 ± 899 |
2.64 |
0.017 |
1.18 |
-0.10 |
0.921 |
-0.05 |
| Peak AT Force (N/kg) |
67.7 ± 18.9 |
50.1 ± 14.2 |
2.38 |
0.005* |
1.17 |
55.3 ± 10.7 |
1.82 |
0.085 |
0.81 |
-0.92 |
0.368 |
-0.41 |
* indicate significant different at an alpha level of 0.016 (Bonferroni correction). ROL: recreational original landing; RAL: recreational adjusted landing; ELITE: elite player scissor kick jump; t: test statistic; P: probability value; d: Cohen’s d effect size; V
Forward: average forward velocity; vGRF: vertical ground reaction force; tGRF: transverse ground reaction force; hGRF: horizontal ground reaction force; Ext. Foot Pos: external foot position; A negative external foot position corresponds to an external rotation; A positive ankle angle is corresponding to a dorsi flexion angle; M
Ankle: Sagittal ankle moment; AT
MA: Achilles tendon moment arm; AT: Achilles tendon; IC: initial contact.
