## 4 Discussion  
In the present study, in both groups (WBV and sham), there was a reduction in skin temperature and blood flow velocity, corroborating previous studies. [PERSON] et al. (2000) evaluated 61 diabetic participants and 16 healthy subjects, and they reported that basal skin temperature in diabetic patients was significantly lower than in healthy patients, in addition to lower temperature variation and recovery after intervention. These findings agree with the present study, where there was little variation in some of the evaluated points and, in some of them, the temperature remained constant [10]. According to [PERSON] et al. (1994), this fact can be explained by the dilation of arteriovenous anastomoses and reduced blood supply in the capillaries due to autonomic neuropathy [11]. The study by [PERSON] et al. (1998) inferred that capillary blood flow and blood pressure are lower in autonomic diabetic neuropathy because the anatomical walls are larger, directing flow and damaging peripheral sympathetic nerves. This promotes a slow recovery of skin temperature, justifying the smallest temperature variation in the present study [24]. [PERSON] et al. (2017) performed a study with a vibratory platform with 36 diabetic participants, of which 17 were trained on the platform for 12 weeks and 19 participants maintained their daily activities only. Reductions in peak systolic velocity and diastolic pressure were noticed in the WBV group, but without significant difference from the control group. In the present study, although no peak systolic velocity and diastolic pressure were evaluated, we observed a reduction in which there was a reduction in blood flow velocity in the evaluated arteries. This finding can be explained by the possible vibration-induced dilation of the smaller blood vessels present in the muscles, reducing peripheral vascular resistance by inhibiting endothelin, an important vasoconstritor [25]. [PERSON] et al. (2013) evaluated 40 diabetics, 20 of whom underwent 12 weeks of whole-body vibration training, and reported increased blood flow velocity after 12 weeks of intervention, with a significant difference compared with the control group. This divergence in the results found in relation to the present study is possibly due to the accomplishment of a training program over a long period of time, enhancing the effects of vibration and promoting long-term results, which may not be the case in the first session of the study training [8]. [PERSON] et al. (2010) analyzed 112 patients diagnosed with type 2 diabetes through thermographic images of the plantar region, correlating the presence of diabetic neuropathy and the cutaneous temperature of these individuals. Higher values of mean and global foot temperature were found in patients with neuropathy, in addition to a positive correlation with temperature in the hallux regions, bilaterally. This finding may be justified by neuropathic feet being warm, with palpable pulses \begin{table}
\begin{tabular}{l c c c c c c c} \hline \hline \multirow{2}{*}{**Variables**} & \multicolumn{3}{c}{**WBV**} & \multicolumn{3}{c}{**Sham**} & \multirow{2}{*}{**Effect Size**} & \multirow{2}{*}{\(p\)**-Value**} \\ \cline{2-2} \cline{6-7}  & **Before** & **Post** & \(p^{*}\) & & & & \\ \hline Right dorsal artery & 29.3 (\(\pm\)25.79) & 23.4 (\(\pm\)24.61) & 0.31 & 27.9 (\(\pm\)29.14) & 29.3 (\(\pm\)25.79) & 0.81 & \(-\)0.23 & 0.61 \\ Left dorsal artery & 24.6 (\(\pm\)21.65) & 20.3 (\(\pm\)20.25) & 0.37 & 26.8 (\(\pm\)23.58) & 23.8 (\(\pm\)21.21) & 0.13 & \(-\)0.17 & 0.71 \\ Right tibial artery & 23.1 (\(\pm\)25.92) & 21.4 (\(\pm\)23.68) & 0.58 & 21.3 (\(\pm\)24.76) & 23.2 (\(\pm\)26) & 0.06 & \(-\)0.07 & 0.87 \\ Left tibial Artery & 27.1 (\(\pm\)25.36) & 20.5 (\(\pm\)19.66) & 0.01 \({}^{*}\) & 24 (\(\pm\)26.24) & 27.2 (\(\pm\)25.42) & 0.69 & \(-\)0.26 & 0.52 \\ \hline \hline \end{tabular} Abbreviations: WBV, whole-body vibration; sham, dummy vibration. \(p^{*}\) Wilcoxon; \(p\)-value, Mann–Whitney, \({}^{*}\) statistically significant result.  
\end{table}