## 4 Discussion
### Effect of WBVE on sEMG  
In the present study, significant changes in the electromyographic signal of the VL muscle on both legs were observed in the acute effect of the last session of the 5-week WBVE intervention (Table 6). This is in agreement with other authors that have shown improvement in muscle activity due to WBVE intervention in different muscles in individuals with various diseases [27], such as acute and chronic stroke [30; 56], spinal cord injury [24], Friedreich's ataxia [57], and cerebral palsy [29]. [PERSON] et al. detected changes in muscle activity even in individuals with paresis [30]. Furthermore, increased muscular activity was also observed in healthy individuals [34; 58]. [PERSON] et al. found that WBVE increased the sEMG amplitude of the VL muscle during an isometric semi-squat exercise in active woman [34]. A systematic review has analyzed the effects of WBVE in lower limbs' neuromuscular activity, suggesting that there was a greater recruitment of motor units after WBVE [27]. In the current study, no effects were observed in %RMS in the acute effect of the first session or in the cumulative effect (Tables 5 and 7). Considering the acute effect, [PERSON] et al. (2017) also reported no alteration in the sEMG of the VL muscle when healthy individuals were exposed to 10 minutes of WBV at 35 Hz [59]. [PERSON] et al. (2016) evaluated the immediate effects of WBV in healthy individuals with frequencies of 30 and 50 Hz, and no significant differences in the value of RMS were found [60]. Considering the cumulative effect (Table 7), the present study found no significant changes in the electromyographic signal of the VL muscle in either leg. [PERSON] et al. (2018) also observed no statistically significant differences in body composition or muscle architecture variables, nor changes in muscle activity during the take-off phase of the vastus lateralis pre- versus post-training in a 6-week WBVE treatment with a frequency between 30 and 45 Hz in healthy individuals [61]. Some limitations of this study should be pointed out, such as the relatively small number of participants; however, the statistical power was 95 %. Moreover, although we evaluated both lower limbs, we did not register which lower limb was the dominant one. Nevertheless, a strength of this work is the improvement in neuromuscular activity; this finding may have positive clinical implications by improving daily activities in individuals with MetS. In conclusion, WBVE can be a modality of exercise to increase the neuromuscular activity of the VL muscle using a 5-week protocol. An increase in ROM of the knees in individuals with MetS was not observed with the same protocol. WBVE appears to be an adequate strategy to improve neuromuscular activity in individuals with MetS, overweight, and obesity, being a potential opportunity for the management of physical impairment in these individuals. Nevertheless, further additional studies with larger samples and more prolonged periods of WBVE exposure are needed to confirm our preliminary findings. Conceptualization, M.B.-F.; Data curation, C.R.d.S.-G., D.d.C.d.S.-C., L.L.P.-D., E.M.-M., M.E.S.M.-O., Y.T.-S., A.P.d.S.L., J.A.B., M.J.d.S.P., V.L.X., A.G.d.M., L.F.F.D.S., A.R.-S., A.F.-S., G.M.G.-L., M.C.M.-F., A.d.R.P.M., T.A., A.C.R.L., V.A.M., A.S. and M.B.-F.; Formal analysis, M.J.d.S.P., V.L.X., and R.T.; Fundingacquisition, M.B.-F.; Investigation, C.R.d.S.-G., D.d.C.d.S.-C., L.L.P.-D., E.M.-M., M.E.S.M.-O., Y.T.-S., A.P.d.S.L., A.G.d.M., L.F.F.D.S., A.R.-S., G.M.G.-L., M.C.M.-F. and A.d.R.P.M. ; Methodology, C.R.d.S.-G., D.d.C.d.S.-C., L.L.P.-D., E.M.-M., M.E.S.M.-O., Y.T.-S., A.P.d.S.L., A.G.d.M., L.F.F.D.S., A.R.-S., A.F.-S., G.M.G.-L., M.C.M.-F. and A.d.R.P.M.