## 3 Results
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Variable**} & \multirow{2}{*}{**Group**} & \multirow{2}{*}{**Pre-Test**} & \multirow{2}{*}{**Post-Test**} & \multirow{2}{*}{**Post-30**} & \multicolumn{2}{c}{**F (P)**} & \multirow{2}{*}{**Group**} & \multirow{2}{*}{**Time**} & \multirow{2}{*}{
\begin{tabular}{c} **Group** \(\times\) \\ **Time** \(\mathsf{n}^{2}\) \\ \end{tabular} } \\ \hline \multirow{2}{*}{Fp1} & HF–LI & 0.40 \(\pm\) 0.24 & 0.39 \(\pm\) 0.15 & 0.33 \(\pm\) 0.11 & \multirow{2}{*}{0.835} & 0.118 & 2.212 & \multirow{2}{*}{0.132} \\  & LF–HI & 0.40 \(\pm\) 0.21 & 0.32 \(\pm\) 0.07 & 0.36 \(\pm\) 0.06 & (0.444) & (0.734) & (0.128) & 0.132 \\  & HF–HI & 0.33 \(\pm\) 0.15 & 0.31 \(\pm\) 0.08 & 0.31 \(\pm\) 0.08 & & & & \\ \hline \multirow{2}{*}{Fp2} & HF–LI & 0.41 \(\pm\) 0.23 & 0.41 \(\pm\) 0.16 & 0.34 \(\pm\) 0.12 & \multirow{2}{*}{0.628} & 0.508 & 3.351 & \multirow{2}{*}{0.188} \\  & LF–HI & 0.41 \(\pm\) 0.21 & 0.32 \(\pm\) 0.07 & 0.37 \(\pm\) 0.08 & (0.541) & (0.482) & (0.049 * ) & \\  & HF–HI & 0.39 \(\pm\) 0.19 & 0.34 \(\pm\) 0.11 & 0.33 \(\pm\) 0.09 & & & & \\ \hline \multirow{2}{*}{F3} & HF–LI & 0.35 \(\pm\) 0.19 & 0.38 \(\pm\) 0.17 & 0.31 \(\pm\) 0.10 & \multirow{2}{*}{0.232} & 0.594 & 3.435 & \multirow{2}{*}{0.192} \\  & LF–HI & 0.37 \(\pm\) 0.21 & 0.30 \(\pm\) 0.09 & 0.37 \(\pm\) 0.09 & (0.794) & (0.447) & (0.046 * ) & \\  & HF–HI & 0.28 \(\pm\) 0.15 & 0.30 \(\pm\) 0.09 & 0.30 \(\pm\) 0.10 & & & & \\ \hline \multirow{2}{*}{F4} & HF–LI & 0.35 \(\pm\) 0.19 & 0.38 \(\pm\) 0.16 & 0.30 \(\pm\) 0.12 & \multirow{2}{*}{0.374} & 0.023 & 3.803 & \multirow{2}{*}{0.208} \\  & LF–HI & 0.36 \(\pm\) 0.21 & 0.30 \(\pm\) 0.10 & 0.36 \(\pm\) 0.11 & \multirow{2}{*}{(0.691)} & 0.880 & (0.034 * ) & \\  & HF–HI & 0.28 \(\pm\) 0.14 & 0.28 \(\pm\) 0.10 & 0.29 \(\pm\) 0.09 & & & & \\ \hline \multirow{2}{*}{C3} & HF–LI & 0.32 \(\pm\) 0.20 & 0.34 \(\pm\) 0.19 & 0.27 \(\pm\) 0.09 & \multirow{2}{*}{0.035} & 1.111 & 3.872 & \multirow{2}{*}{0.211} \\  & LF–HI & 0.34 \(\pm\) 0.22 & 0.27 \(\pm\) 0.10 & 0.33 \(\pm\) 0.11 & \multirow{2}{*}{(0.965)} & 1.031 & 3.872 & \multirow{2}{*}{0.211} \\  & HF–HI & 0.26 \(\pm\) 0.15 & 0.28 \(\pm\) 0.08 & 0.28 \(\pm\) 0.09 & & & & \\ \hline \multirow{2}{*}{C4} & HF–LI & 0.33 \(\pm\) 0.20 & 0.37 \(\pm\) 0.18 & 0.30 \(\pm\) 0.11 & \multirow{2}{*}{0.371} & 0.939 & 4.851 & \multirow{2}{*}{0.251} \\  & LF–HI & 0.35 \(\pm\) 0.23 & 0.27 \(\pm\) 0.11 & 0.34 \(\pm\) 0.12 & \multirow{2}{*}{(0.693)} & 0.934 & 4.851 & \multirow{2}{*}{0.251} \\  & HF–HI & 0.27 \(\pm\) 0.15 & 0.27 \(\pm\) 0.09 & 0.29 \(\pm\) 0.09 & & & & \\ \hline \multirow{2}{*}{P3} & HF–LI & 0.30 \(\pm\) 0.21 & 0.34 \(\pm\) 0.18 & 0.25 \(\pm\) 0.10 & \multirow{2}{*}{0.150} & \multirow{2}{*}{0.000} & 2.863 & \multirow{2}{*}{0.165} \\  & LF–HI & 0.32 \(\pm\) 0.24 & 0.27 \(\pm\) 0.15 & 0.30 \(\pm\) 0.11 & \multirow{2}{*}{(0.861)} & 0.994 & 4.301 & \multirow{2}{*}{0.165} \\  & HF–HI & 0.30 \(\pm\) 0.17 & 0.26 \(\pm\) 0.08 & 0.28 \(\pm\) 0.08 & & & & \\ \hline \multirow{2}{*}{P4} & HF–LI & 0.32 \(\pm\) 0.20 & 0.34 \(\pm\) 0.19 & 0.25 \(\pm\) 0.10 & \multirow{2}{*}{0.199} & 0.590 & 4.301 & \multirow{2}{*}{0.229} \\  & LF–HI & 0.32 \(\pm\) 0.24 & 0.24 \(\pm\) 0.11 & 0.30 \(\pm\) 0.12 & \multirow{2}{*}{(0.820)} & (0.449) & (0.023 * ) & \\ \cline{1-1}  & HF–HI & 0.26 \(\pm\) 0.15 & 0.26 \(\pm\) 0.08 & 0.28 \(\pm\) 0.08 & & & & \\ \hline \hline \end{tabular}  
* \({}^{*}\)\(p<\) 0.05. Values are presented as the mean \(\pm\) standard deviation. Pre-test: before electrical stimulation; Post-test: directly after electrical stimulation; Post-30: 30 min after electrical stimulation; high frequency–low intensity group (HF–LI); low frequency–high intensity group (LF–HI); high frequency–high intensity group (HF–HI).  
\end{table} 
Table 4: Changes in the relative \(\theta\)-power spectrum. Figure 4: _Cont._