## 4 Discussion  
The main objective of this systematic review was to evaluate the effect of SVT and LVT on the functional capacity of individuals with KOA. After analyzing the included studies and considering their limitations, the results suggest that SVT and LVT may be beneficial interventions on functional capacity in individuals with KOA. The current systematic review provides a comprehension regarding the benefit influence of two different types of vibration interventions in functional capacity of KOA individuals. The findings of this study demonstrated that the SVT and LVT might be effective to improve the functional capacity of KOA individuals. The current review included nine studies, summarizing and discussing the effects of SVT and LVT on the functional capacity, indicating beneficial effects of vibration exposure on muscle strength, joint stiffness, balance, functional mobility, and in the range of motion and biomechanics of the gait. In addition, the effects of the SVT and LVT, reducing the level of pain and the improvement of the electromyographic profile, are also presented. Regarding the KOA individuals in the selected studies, the age varied from 46 up to 80 years, and the BMI ranged between 18 and 44 kg/m\({}^{2}\), including people who had a diagnosis of unilateral or bilateral KOA submitted to SVT or LVT. From a total of 352 individuals, 78.15% were female, and these characteristics are in accordance with other authors that reported that the osteoarthritis is not only epidemiologically significant but also influenced by hormonal fluctuations [44, 45]. Likewise, aging as obesity are a risk factor that increases the incidence of KOA [30]. It is important to highlight that the com  
Figure 2: **(A)** RoB assessment for studies evaluating the effects of SVT in KOA individuals. Based on data from five studies (total sample size = 226) with RoB categorized into selection, performance, detection, attrition, reporting, and other biases [31, 34, 39, 40, 41]. **(B)** RoB assessment for studies evaluating the effects of LVT in KOA individuals. Based on data from four studies (total sample size = 126) with RoB categorized into selection, performance, detection, attrition, reporting, and other biases [13, 14, 32, 33]. prehension of these physiological and behavioral changes is crucial for tailoring effective management strategies for KOA individuals [35; 45; 46; 47]. In the SVT studies [31; 39; 40; 41], individuals were exposed to a cumulative intervention with frequencies ranging from 5 to 30 Hz, amplitudes from 1.25 to 3.75, and aPeak values ranging from 0.12 to 5.3 g (one study did not report amplitude and aPeak [31]). This range is in accordance with other studies, which use similar biomechanics parameters (f: 20 Hz, A: 2 mm, and aPeak:1.6 g/f: 35 Hz, A: 4-6 mm, and aPeak: 9.8-14.7 g) for the treatment of KOA individuals [14; 32; 33]. Furthermore, a previous meta-analysis showed that KOA individuals exposed to SVT at low or high frequencies had beneficial effects in functional capacity, considering the functional performance of the TUG test; the self-reported function used the WOMAC questionnaire, muscle strength, and reduced in pain [48]. Likewise, in the LVT studies [14; 32; 33], participants were exposed to cumulative MV by different devices (e.g., discharge prostheses with vibrating devices, pneumatic vibrator, and Vitberg) using a frequency range of 5 to 150 Hz, amplitude from 0.2 to 1.6, and aPeak ranging from 1.8 to 5.8 g (one study did not report amplitude and aPeak [14]). Furthermore, studies with the same population used similar frequencies: one study used a frequency of 50 Hz and an amplitude of 1.6 mm [48]; however, [PERSON] et al. [49] used a frequency alternating in cycles between 10, 27, and 42 Hz but did not report the amplitude used. Concerning acute exposure, in one study using SVT, individuals were exposed to an acute vibration with progressive frequencies of 5 to 30 Hz; amplitudes of 1.25, 2.5, and 3.75 mm; and peak values ranging from 0.12, 0.25, to 0.37 g [42].