Table 3.
Baseline and final data on countermovement jump (CMJ) performance, gastrocnemius (Ga.) medialis electro-mechanical efficiency (EME), tensiomyographic (TMG) assessment and inflammatory response of both groups.
| Control group | Plyometric group | p-level | ||||||
|---|---|---|---|---|---|---|---|---|
| pre | post | Pre | Post | time | group | interaction | ɳ2 | |
| CMJ | ||||||||
| Height (cm) | 10.2±2.4 | 10.2±3.2 | 10.5±4.5 | 11.7±4.5 | .019* | .524 | .057† | .236 |
| Relative power (W/kg) | 35.7±5.9 | 36.4±6.8 | 34.7±9.1 | 38.4±8.1 | .187 | .926 | .916 | --- |
| Vertical velocity (m/s) | 1.38±0.2 | 1.39±.2 | 1.38±.3 | 1.48±.3 | .023* | .645 | .174 | .233 |
| EME (posterior tibial nerve stimulation) | ||||||||
| MPTP/mV | 6.8±3.7 | 6.2±2.3 | 6.4±2.8 | 4.9±2.6 | .071 | .843 | .458 | --- |
| Ga. medialis (Dm/mm) | 8.4±2.8 | 6.7±2.0 | 6.9±2.7 | 6.7±1.6 | .076 | .278 | .094† | .133 |
| Ga. medialis EME (mV/mm) | 1.4±.5 | 1.2±.4 | 1.35±.9 | 1.7±.9 | .461 | .521 | .095† | .136 |
| TMG data | ||||||||
| Biceps femoris Tc (ms) | 42.0±7.8 | 44.1±7.2 | 42.3±10 | 38.9±11 | .606 | .503 | .028† | .210 |
| Biceps femoris Dm (mm) | 5.9±2.6 | 6.0±2.6 | 6.5±2.8 | 4.8±1.9 | .036* | .769 | .031† | .204 |
| Ga. lateralis Tc (ms) | 25.2±2.8 | 24.3±2.9 | 34.2±12 | 30.1±11 | - | .858 | - | --- |
| Ga. lateralis Dm (mm) | 4.2±1.3 | 4.1±1.6 | 4.8±1.1 | 4.2±1.5 | .268 | .533 | .324 | --- |
| Ga. medialis Tc (ms) | 29.9±5.0 | 30.3±4.4 | 31.7±7.0 | 27.6±4.8 | .125 | .823 | .075† | .240 |
| Ga. medialis Dm (mm) | 3.9±1.6 | 4.1±1.6 | 4.1±1.8 | 4.2±1.6 | .783 | .837 | .884 | -- |
| Tibialis anterior Tc (ms) | 22.1±8.5 | 22.7±6.7 | 23.8±2.9 | 20.9±2.6 | .569 | .360 | .999 | -- |
| Tibialis anterior Dm (mm) | 2.8±1.4 | 2.8±1.5 | 2.5±1.0 | 2.8±.8 | .439 | .726 | .623 | -- |
| Vastus lateralis Tc (ms) | 25.0±4.1 | 23.4±2.3 | 22.9±3.6 | 23.0±2.0 | .301 | .233 | .307 | -- |
| Vastus lateralis Dm (mm) | 5.4±1.8 | 5.1±1.6 | 4.0±1.5 | 4.1±1.4 | .690 | .064 | .411 | -- |
| Estimated MHC-I (%) | 30.8±17 | 26.6±12 | 24.5±14 | 23.4±8.8 | .374 | .345 | .579 | -- |
| Inflammatory markers | ||||||||
| CRP (mg/L-1) | 1.6±1.1 | 1.2±0.6 | 2.3±1.7 | 3.2±2.1 | .671 | .063 | .122 | -- |
| LDH (µkat/L-1) | 2.5±1.5 | 1.3±1.5 | 2.9±.4 | 2.6±.9 | .026* | .050 | .173 | -- |
MPTP – M-wave peak-to-peak amplitude; Tc – Contraction time; Dm – Maximal radial displacement amplitude; MHC-I – Myosin heavy chain I proportion; CRP – C-reactive protein; LDH – Lactate dehydrogenase; ɳ2- partial eta squared;
*
Significant time effect (p<.05);
†
Significant interaction effect (p<.10).