Table 2.
Responses to drop-jump protocol and impact on power output, running economy, and time trial performance
| Control (n = 22) | Intervention (n = 22) | p value | Effect size | |
|---|---|---|---|---|
| Drop-jump protocol | ||||
| Perceptual responses | ||||
| Muscle discomfort pre* | 1.0 ± 0.9 | 0.7 ± 0.6 | n.s. | – |
| Muscle discomfort post* | 0.8 ± 0.8 | 2.4 ± 1.7 | < 0.001 | Large |
| Unpleasantness pre* | 0.8 ± 0.7 | 0.8 ± 0.8 | n.s. | – |
| Unpleasantness post* | 0.8 ± 0.7 | 2.3 ± 1.6 | < 0.001 | Large |
| Isokinetic power output test | ||||
| Knee extension pre* (W) | 152 ± 40 | 150 ± 45 | n.s. | – |
| Knee extension post* (W) | 150 ± 40 | 133 ± 45 | < 0.001 | Large |
| Running economy test | ||||
| Oxygen cost (ml kg−1 km−1) | 199 ± 11 | 205 ± 14 | 0.005 | Small |
| Energy cost (kcal kg−1 km−1) | 0.99 ± 0.05 | 1.03 ± 0.07 | 0.002 | Medium |
| Carbohydrate usage (g min−1) | 2.74 ± 0.78 | 3.17 ± 0.96 | 0.013 | Small |
| Heart rate (bpm) | 158 ± 11 | 164 ± 11 | 0.001 | Small |
| Perceptual responses | ||||
| Perceived physical strain | 12.3 ± 1.9 | 13.5 ± 1.9 | 0.001 | Medium |
| Perceived mental strain | 6.2 ± 1.5 | 7.7 ± 1.6 | < 0.001 | Medium |
| Valence | 2.9 ± 1.3 | 1.5 ± 1.6 | < 0.001 | Medium |
| Felt activation | 3.8 ± 1.0 | 4.0 ± 0.7 | n.s. | – |
| Time trial times | ||||
| TT time (h:min:s) | 1:23:11 ± 0:10:25 | 1:26:37 ± 0:11:36 | < 0.001 | Small |
| 2nd-half/1st-half split | 0.1 ± 1.1 | 1.4 ± 2.2 | 0.003 | Medium |
* = simple (main) group effects (using partial eta squared as effect size measure) of two-way repeated measures ANOVA after significant treatment * time interaction effect. TT = time trial. Data represented as mean ± SD