Table 5. Descriptive statistics and ANCOVA for the performance variables, considering intervention subgroups.
| All
variables |
Strength
group ± SD |
Hedges
g |
Ballistic
group ± SD |
Hedges
g |
ANCOVA |
| Pre-intervention |
Post-intervention |
Pre-intervention |
Post-intervention |
p-value |
η2 |
| CMJ
height (m) |
0.38 ±
0.05 |
0.39 ±
0.06† |
0.18 (-0.87-0.52) |
0.40 ±
0.06 |
0.41 ±
0.06 |
0.16 (-1.00-0.68) |
0.888 |
0.006 |
| CMJ
jump time (s) |
0.69
± 0.08 |
0.67
± 0.08 |
-0.24
(-0.45-0.94) |
0.71
± 0.07 |
0.72
± 0.11 |
0.10
(-0.94-0.73) |
0.348 |
0.055 |
| RSI |
0.55 ±
0.09 |
0.58 ±
0.11 |
0.29 (-0.99-0.41) |
0.55 ±
0.11 |
0.56 ±
0.10 |
0.09 (-0.93-0.74) |
0.598 |
0.027 |
| 5m
(s) |
1.08
± 0.08 |
1.02
± 0.06† |
-0.83
(0.11-1.55) |
1.05
± 0.07 |
1.05
± 0.12§ |
0.00
(-0.84-0.84) |
0.006 |
0.233 |
| 10m
(s) |
1.82 ±
0.12 |
1.77 ±
0.07† |
-0.50 (-0.21-1.20) |
1.79 ±
0.13 |
1.80 ±
0.13§ |
-0.07 (-0.91-0.76) |
0.004 |
0.248 |
| 15m
(s) |
2.48 ±
0.14 |
2.44 ±
0.09 |
-0.33 (-0.37-1.10) |
2.48 ±
0.12 |
2.47 ±
0.12§ |
-0.08 (-0.76-0.92) |
0.005 |
0.236 |
| 20m
(s) |
3.12 ±
0.18 |
3.06 ±
0.08 |
-0.49 (-0.21-1.19) |
3.12 ±
0.12 |
3.10 ±
0.16§ |
-0.14 (0-70-0.97) |
0.018 |
0.187 |
| 505
left (s) |
2.27 ±
0.12 |
2.18 ±
0.13† |
-0.70 (-0.01-1.42) |
2.19 ±
0.16 |
2.12 ±
0.14§ |
-0.45 (-0.40-1.29) |
0.029 |
0.167 |
| 505
right (s) |
2.23 ±
0.09 |
2.19 ±
0.13 |
-0.35 (-0.35-1.05) |
2.20 ±
0.13 |
2.12 ±
0.16§ |
-0.53 (-0.32-1.38) |
0.028 |
0.167 |
| CoDD
left |
0.45 ±
0.14 |
0.44 ±
0.15 |
-0.07 (-0.63-0.76) |
0.41 ±
0.22 |
0.32 ±
0.13 |
-0.48 (-0.37-1.33) |
0.093 |
0.115 |
| CoDD
right |
0.41 ±
0.15 |
0.41 ±
0.15 |
-0.00 (-0.69-0.69) |
0.41 ±
0.19 |
0.33 ±
0.14 |
-0.46 (-0.39-1.31) |
0.198 |
0.080 |
| DSI |
0.98 ±
0.07 |
0.96 ±
0.10 |
-0.23 (-0.47-0.92) |
0.82 ±
0.06 |
0.82 ±
0.11 |
0.00 (-0.84-0.84) |
0.106 |
0.96 |
| CMJ
max F (N) |
2398 ±
334 |
2381 ±
269 |
-0.05 (-0.64-0.75) |
2179 ±
398 |
2206 ±
417 |
0.06 (-0.90-0.77) |
0.611 |
0.026 |
| CMJ
avg F (N) |
1874 ±
228 |
1903 ±
187 |
0.14 (-0.83-0.56) |
1759 ±
328 |
1749 ±
301 |
-0.03 (-0.81-0.87) |
0.134 |
0.103 |
| IMTP
rel F (N/kg) |
27.33 ±
3.11 |
28.14 ±
3.14 |
0.25 (-0.95-0.44) |
31.35 ±
3.35 |
33.04 ±
4.44§ |
0.41 (-1.26-0.43) |
0.032 |
0.169 |
| IMTP
max F (N) |
2436 ±
394 |
2517 ±
449 |
0.19 (-0.88-0.51) |
2664 ±
533 |
2809 ±
602 |
0.25 (-1.08-0.59) |
0.128 |
0.105 |
† = indicates significant difference (p < 0.05) in paired t-test within group§ = Indicates significant difference (p < 0.05) in post-intervention groups when using pretest score as a covariate η2 = partial eta squared (analysis of covariance); CMJ = countermovement jump; F = force; max = maximal; avg = average; DSI = dynamic strength index; RSI = reactive strength index; 505 = change of direction test; CoDD = change of direction deficit; N = newtons; s = seconds; m = meters; N/kg = newtons per kilogram; IMTP = isometric mid-thigh pull; rel = relative; SD = standard deviation.
