## 4 Discussion
\begin{table}
\begin{tabular}{c c c c c} \hline \hline  & n = 9 & \multicolumn{2}{c}{Mean \(\pm\) SD} & \(p\)-value \\ \cline{3-5} Original Signal & & Pre & Post & \\ \cline{2-5}  & MMSE & Complexity Index (CI) &
\begin{tabular}{c} Degree of \\ improvement (\%) \\ \end{tabular} & 0.0039 ** \\  & & \(13.33\pm 2.32\) & \(15.30\pm 1.17\) & \(14.8\) & \\ \hline \multicolumn{5}{c}{Degree of improvement (\%): Post-MMSE (CI)—Pre-MMSE (CI)/Pre-MMSE (CI). Wilcoxon Sign-Rank Test: \(\textbf{{}^{*}}\): \(p<0.001\).} \\ \end{tabular}
\end{table} 
Table 3: The complexity index (CI) of multivariate multiscale entropy (MMSE) values. spontaneous recovery and rehabilitation interventions. All of the subjects in this study were chronic stroke patients with hemiparesis, and this was probably a factor that affected the results of this study. However, the BBS has also been shown to be useful in assessing balance in patients with an acute stroke [23]. Wii Fit balance training (WBT) and progressive balance training (PBT) are both approaches that have been found to be effective in improving balance functions, balance confidence, and activities of daily living [9]. The Wii Fit and MITs both provide VR feedback in the form of games. In a comparison of these two interesting training modules, [PERSON] and [PERSON] explained a noteworthy difference in subjects' performance on standard tests [17]. They showed that community-dwelling elderly subjects (age range: 63-95 years; mean: 83.2 years) using the MITs for 9 sessions showed statistically significant performance improvements on the 6-min walk test (6 MWT), timed up go test (TUG), and chair-stand test (CS). Meanwhile, [PERSON] et al. showed in their study based of community-dwelling elderly subjects (average age: 78.3 years) that the participants obtained no significant effects on their standardized BBS test scores with a Nintendo Wii Fit exercise program [41]. Relatedly, [PERSON] et al. reported that adult subjects (age range: 30-58 years) using the Nintendo Wii Fit for 20 sessions had no significant improvements on the 6 MWT and TUG [42]. That said, the Wii Fit should be more suitable for in-house use and is maybe not suitable for use in a rehabilitation center in a hospital or medical clinic. There is sufficient evidence showing that the use of commercial video games (VGs) could be added as an adjunct treatment in rehabilitation in order to stimulate patient motivation, and that such games could also be used at home to maintain the benefits of rehabilitation for a patient [43; 44]. With regard to COP measurements, [PERSON] and [PERSON] reported that shorter trajectories and smaller distances and areas represent better balance [18]. As shown in Table 2, the results in this study showed significant decrease in AREA_SW and AREA_CC (\(p\) = 0.0391, \(p\) = 0.0078 for AREA_SW and AREA_CC, respectively). The definition of AREA_SW is the area that is enclosed by the COP path per unit of time, and said area can be thought of as being proportional to the product of the mean velocity and mean distance [18]. The value of AREA_SW can be determined by adding the mean COP to the areas of the triangles formed to consecutive points on the COP path [27]. Meanwhile, AREA_CC is the area of a circle with a radius equal to the one-sided 95% confidence limit of the RD time series [18]. Figure 1 clearly shows the changes in AREA_SW and AREA_CC, with both values becoming smaller in the post-test, which means in turn that these two stabilometric parameters are able to detect improvements in balance stability. An MMSE value can be utilized for the assessment of the structural complexity of multivariate systems, and such a value can be determined through the measurement of the relative complexity of the multichannel signals in a plot of the multivariate sample entropy [28]. According to past research, better adaptability in an external environment is indicated by higher complexity, such that the greater the CI value, the greater the postural stability [45]. Table 3 shows the significance of the MMSE results.