## 4 Discussion
### Acceleration Outputs  
Across body sites, \(a_{\text{out}}\) can change by far from the initial \(a_{\text{in}}\)[21; 22; 24; 25; 30]. Thus, measuring \(a_{\text{out}}^{\text{RMS}}\) of the human body has been suggested as a more accurate procedure that leads to a better understanding of the vibration effects on the human body [17] and avoids inconsistencies [12; 13; 15]. At the AN, \(a_{\text{out}}^{\text{RMS}}\) was up to 1.9 g on the LVP, which is lower than what other studies have reported \(\approx\)4 g [17; 21; 25]. However, at KN, the \(a_{\text{out}}^{\text{RMS}}\) was similar between the LVP and these studies (\(\approx\)1.5 g), or even lower (\(\approx\)1 g) [26]. Increasedmuscle activation was seen under leg exposure at these intensities (1-2 g of \(a_{\text{out}}^{\text{RMS}}\)) [17; 21]. In addition, at HI and L3, the LVP \(a_{\text{out}}^{\text{RMS}}\) ranged between \(\approx\)0.1 and 0.3 g versus \(\approx\)0.1 and 0.9 g as seen in previous studies [16; 21; 23; 25; 26]. Regarding bone turnover at these body sites, studies showed \(\approx\)80% [30] of \(\approx\)0.2-0.3 g \(a_{\text{in}}^{\text{peak}}\) reached the HI and L3, showing a good dose-response [1; 3]. These intensities correspond to \(\approx\)0.14-0.21 g of \(a_{\text{out}}^{\text{RMS}}\), similar to the LVP (Table 2). The HE \(a_{\text{out}}^{\text{RMS}}\) on the LVP can reached 0.3 g, whereas in other studies, this was between 0.6 and \(>\)1 g [16; 21; 23; 25]. However, by adopting HS, DS, or LU, the HE \(a_{\text{out}}^{\text{RMS}}\) can be reduced \(<\)0.1 g on the LVP, whereas in other studies, this was \(<\)0.5 g [16; 21; 23]. Regarding safety aspects, there are no detailed guidelines for HE accelerations in WBVE. Notwithstanding, by adopting a posture, users can benefit from the potential safe use of vibration [34]. Between \(f_{\text{set}}\) and postures, changes in \(a_{\text{out}}^{\text{RMS}}\) were reduced as the vibrations were transmitted upward (Table 2). Overall, large changes in \(a_{\text{out}}^{\text{RMS}}\) were found at AN and KN (\(>\)1 g), whereas at HI, L3 and HE were reduced (\(<\)0.1 g), although in the HE adopting ER can be reduced nearly 50% (0.14 g) at 30 Hz and up to 0.05 g adopting LU. Similar outputs were reported previously between \(f_{\text{set}}\)[17; 21; 25; 26] and postures [24; 25]. In addition, although changes were usually higher than the LVP, studies reported lower KN \(a_{\text{out}}^{\text{RMS}}\) (0.1-0.5 g) than the LVP between the \(f_{\text{set}}\). Overall, the highest LVP \(a_{\text{out}}^{\text{RMS}}\) occurred at 25 Hz adopting LU and the lowest at TS at 30 Hz (Table 2). Otherwise, previous studies found the highest \(a_{\text{out}}^{\text{RMS}}\) as the \(f_{\text{set}}\) increases [17; 21]. Although the LVP \(a_{\text{in}}^{\text{peak}}\) was lower than other platforms, present results suggest that the LVP \(a_{\text{out}}^{\text{RMS}}\) is enough to induce changes in the body structures. Furthermore, from a \(a_{\text{out}}^{\text{RMS}}\) point of view, practitioners should pay more attention to leg acceleration when they prepare the exercises for each training session because the changes between trials (frequencies \(\times\) postures) displayed higher outcomes.