Table 4. Descriptive statistics and ANCOVA for the DSI and its constituent variables.
|
Basic variables |
Control
group mean ± SD |
Hedges
g |
Intervention
group mean ± SD |
Hedges
g |
ANCOVA |
| Pre-intervention |
Post-intervention |
Pre-intervention |
Post-intervention |
p-value |
η2 |
| DSI |
0.86 ±
0.14 |
0.93 ±
0.13 † |
0.49 (-1.22-0.24) |
0.91 ±
0.10 |
0.89 ±
0.14 |
-0.16 (-0.37-0.70) |
0.052 |
0.087 |
| CMJ
max F (N) |
2246 ±
295 |
2387 ±
327 |
0.44 (-1.16-0.29) |
2309 ±
371 |
2310 ±
341 |
-0.00 (-0.54-0.53) |
0.318 |
0.026 |
| CMJ
avg F (N) |
1790 ±
231 |
1896 ±
209 |
0.47 (-1.22-0.28) |
1827 ±
273 |
1840 ±
247 |
0.05 (-0.58-0.48) |
0.181 |
0.046 |
| IMTP
rel F (N/kg) |
28.94 ±
4.57 |
28.02 ±
3.87 |
-0.21 (-0.51-0.93) |
28.97 ±
3.73 |
30.14 ±
4.39 § |
0.28 (-0.82-0.25) |
0.039 |
0.108 |
| IMTP
max F (N) |
2653 ±
476 |
2597 ±
480 |
-0.11 (-0.60-0.83) |
2529 ±
461 |
2636 ±
526 † |
0.21 (-0.75-0.32) |
0.054 |
0.094 |
* η2 = partial eta squared (analysis of covariance); CMJ = countermovement jump; F = force; max = maximal; avg = average; DSI = dynamic strength index; IMTP = isometric mid-thigh pull; rel = relative; SD = standard deviation; N = newtons; N/kg = newtons per kilogram† = 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.
