Table 2.
SWS after WBV for both MG and SOL muscles during graded plantar flexor contraction.
| Muscle | Vibration frequency | Projection | Shear wave speed (m/s) |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pre |
Post |
|||||||||||
| Contraction level (% MVC) |
Contraction level (% MVC) |
|||||||||||
| 0 | 25 | 50 | 75 | 100 | 0 | 25 | 50 | 75 | 100 | |||
|
MG |
0 Hz | Longitudinal | 2.14 ± 0.3 | 2.49 ± 0.6 | 2.84 ± 0.7 | 3.94 ± 1.0 | 4.92 ± 1.0 | 2.17 ± 0.3 | 2.85 ± 0.6* | 3.21 ± 0.7 | 3.78 ± 1.0 | 4.92 ± 1.0 |
| transverse | 2.02 ± 0.4 | 2.24 ± 0.4 | 2.4 ± 0.4 | 2.93 ± 0.5 | 3.97 ± 1.1 | 1.93 ± 0.2 | 2.33 ± 0.4 | 2.57 ± 0.6 | 3.21 ± 1.0 | 4.22 ± 1.4 | ||
| 6 Hz | Longitudinal | 2.29 ± 0.7 | 2.60 ± 0.8 | 2.98 ± 0.8 | 3.78 ± 1.0 | 5.07 ± 1.3 | 2.18 ± 0.3 | 2.46 ± 0.4 | 2.86 ± 0.7 | 4.01 ± 1.3 | 5.19 ± 1.4 | |
| transverse | 2.21 ± 0.4 | 2.32 ± 0.4 | 2.63 ± 0.6 | 3.13 ± 0.7 | 4.18 ± 1.5 | 2.09 ± 0.4 | 2.20 ± 0.5 | 2.37 ± 0.5 | 3.21 ± 0.9 | 6.61 ± 7.7 | ||
| 12 Hz | Longitudinal | 2.14 ± 0.3 | 2.66 ± 0.6 | 3.16 ± 0.7 | 3.84 ± 1.0 | 4.88 ± 1.1 | 2.07 ± 0.4 | 2.54 ± 0.6 | 3.06 ± 0.8 | 4.01 ± 1.0 | 5.08 ± 1.1 | |
| transverse | 2.41 ± 1.4 | 2.24 ± 0.5 | 2.53 ± 0.5 | 3.52 ± 1.2 | 4.38 ± 1.4 | 1.92 ± 0.3 | 2.13 ± 0.6 | 2.49 ± 0.6 | 3.35 ± 1.2 | 4.05 ± 1.1 | ||
|
24 Hz |
Longitudinal | 2.19 ± 0.3 | 2.59 ± 0.6 | 3.07 ± 0.8 | 3.75 ± 1.2 | 5.26 ± 1.4 | 2.40 ± 0.2* | 2.61 ± 0.8 | 2.78 ± 0.4 | 3.70 ± 1.2 | 5.06 ± 1.3 | |
| transverse |
1.97 ± 0.4 |
2.21 ± 0.4 |
2.47 ± 0.5 |
3.10 ± 0.9 |
4.20 ± 1.4 |
2.01 ± 0.3 |
2.33 ± 0.6 |
2.50 ± 0.5 |
3.68 ± 1.6 |
4.58 ± 1.6 |
||
| SOL | 0 Hz | Longitudinal | 2.66 ± 1.2 | 4.56 ± 1.2 | 5.29 ± 1.1 | 5.96 ± 1.2 | 6.19 ± 1.2 | 2.54 ± 0.8 | 4.39 ± 1.4 | 5.35 ± 1.3 | 5.82 ± 1.4 | 6.27 ± 1.0 |
| transverse | 1.98 ± 0.5 | 3.82 ± 1.2 | 4.83 ± 1.6 | 5.25 ± 1.5 | 5.76 ± 1.5 | 2.02 ± 0.3 | 3.95 ± 1.4 | 4.88 ± 1.6 | 5.67 ± 1.6 | 6.39 ± 1.4 | ||
| 6 Hz | Longitudinal | 2.46 ± 0.4 | 4.47 ± 1.4 | 4.88 ± 1.3 | 5.83 ± 1.0 | 6.25 ± 1.0 | 2.58 ± 0.9 | 3.90 ± 1.0 | 5.01 ± 1.5 | 5.81 ± 1.0 | 6.10 ± 0.9 | |
| transverse | 2.25 ± 0.4 | 3.47 ± 1.2 | 4.49 ± 1.6 | 5.43 ± 1.5 | 5.55 ± 1.5 | 2.04 ± 0.4 | 3.29 ± 1.1 | 4.33 ± 1.4 | 5.20 ± 1.5 | 5.72 ± 1.3 | ||
| 12 Hz | Longitudinal | 2.57 ± 0.6 | 4.37 ± 1.2 | 4.97 ± 1.2 | 5.63 ± 1.3 | 6.08 ± 0.7 | 2.29 ± 0.3 | 4.12 ± 1.2 | 4.61 ± 1.3 | 5.56 ± 1.1 | 6.14 ± 0.6 | |
| transverse | 2.16 ± 0.9 | 3.04 ± 1.1 | 4.55 ± 1.0 | 5.51 ± 1.4 | 6.27 ± 1.2 | 2.02 ± 0.6 | 3.53 ± 1.6 | 4.12 ± 1.5 | 5.10 ± 1.4 | 5.82 ± 1.0 | ||
| 24 Hz | Longitudinal | 2.57 ± 0.5 | 4.7 ± 1.6 | 5.19 ± 1.4 | 6.02 ± 1.6 | 6.12 ± 1.4 | 2.64 ± 0.9 | 4.12 ± 1.4* | 4.86 ± 1.4 | 5.36 ± 1.3 | 5.95 ± 1.5 | |
| transverse | 2.14 ± 0.5 | 3.71 ± 1.1 | 4.73 ± 1.4 | 5.69 ± 1.5 | 5.81 ± 1.1 | 2.06 ± 0.3 | 3.65 ± 1.6 | 4.87 ± 1.8 | 5.51 ± 1.4 | 6.02 ± 1.0 | ||
MVC; maximum voluntary contraction, MG; medial gastrocnemius, SOL; soleus. *Significant changes between pre and post WBV (p < 0.01).