## 3 Results
### Sub-Group Results  
The results of SampEn RR, SampEn SV, SampEn CO, SampEn BB, and BR in the three groups are shown in Table 5. There was no significant difference in each stage in BR for the S group. The BR of the S group was significantly different from that of the E group in both the sub-max stage and the ACP stage (\(p<0.05\)). The BR of the N and E groups increased with exercise time, and the change in the E group was larger than that of group N. The results for SampEn SV show that the S group was significantly different (\(p<0.05\)) at each stage. SampEn RR in the N and E Groups was significantly higher than in the S group at rest. The SampEn RR values were similar in both groups at the ACP stage. The results for SampEn RR and SampEn SV in the three groups are shown in Figure 8. The SampEn RR results were significantly different in the E group between rest, sub-max, and ACP.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline  & & \multicolumn{2}{c}{**Rest**} & \multicolumn{2}{c}{**Sub-Max**} & \multicolumn{2}{c}{**ACP**} \\  & & **Mean \(\pm\) SD** & **Median** & **Mean \(\pm\) SD** & **Median** & **Mean \(\pm\) SD** & **Median** \\ \hline \multirow{4}{*}{SampEn RR} & S (N = 8) & 1.04 \(\pm\) 0.45 & 1.11 & 1.11 \(\pm\) 0.44 & 1.02 & 1.41 \(\pm\) 0.57 & 1.51 \\  & N (N = 8) & 1.26 \(\pm\) 0.42 & 1.31 \(\char 129\) & 1.29 \(\pm\) 0.51 & 1.23 & 1.36 \(\pm\) 0.44 & 1.38 \\  & E (N = 8) & 0.73 \(\pm\) 0.45 & 0.67 & 1.36 \(\pm\) 0.44 & 1.38 \(\ast\) & 1.16 \(\pm\) 0.38 & 1.07 \(\ast\) \\  & S (N = 8) & 1.01 \(\pm\) 0.48 & 1.24 & 1.26 \(\pm\) 0.44 & 1.22 \(\ast\) & 1.31 \(\pm\) 0.46 & 1.35 \(\ast\) \\ \multirow{4}{*}{SampEn SV} & N (N = 8) & 1.18 \(\pm\) 0.33 & 1.15 & 1.65 \(\pm\) 0.39 & 1.54 \(\ast\)\# & 2.13 \(\pm\) 0.12 & 2.15 \(\ast\) \\  & E (N = 8) & 1.39 \(\pm\) 0.35 & 1.42 \(\dagger\) & 1.68 \(\pm\) 0.28 & 1.64 \(\ast\) & 2.13 \(\pm\) 0.10 & 2.13 \(\ast\) \\ \multirow{4}{*}{SampEn CO} & S (N = 8) & 1.76 \(\pm\) 0.27 & 1.77 \(\dagger\)\# & 2.01 \(\pm\) 0.35 \(\dagger\) & 2.13 & 2.16 \(\pm\) 0.08 & 2.16 \(\ast\) \\  & N (N = 8) & 1.44 \(\pm\) 0.39 & 1.43 & 1.78 \(\pm\) 0.37 & 1.77 \(\ast\)\#\# & 2.14 \(\pm\) 0.09 & 2.15 \(\ast\) \\ \multirow{4}{*}{SampEn BB} & E (N = 8) & 1.37 \(\pm\) 0.35 & 1.40 & 1.76 \(\pm\) 0.27 & 1.80 \#\(\dagger\) & 2.17 \(\pm\) 0.11 & 2.18 \(\ast\) \\  & S (N = 5) & 1.88 \(\pm\) 0.43 & 1.98 & 2.34 \(\pm\) 0.35 & 2.30 \(\#\) & 1.87 \(\pm\) 0.23 & 1.91 \\ \multirow{4}{*}{SampEn BB} & N (N = 8) & 1.99 \(\pm\) 0.48 & 2.15 \(\dagger\) & 2.29 \(\pm\) 0.78 & 2.47 & 1.80 \(\pm\) 0.39 & 1.83 \\  & E (N = 7) & 2.10 \(\pm\) 0.45 & 2.25 & 2.38 \(\pm\) 0.25 & 2.35 \(\#\) & 1.47 \(\pm\) 0.38 & 1.51 \(\ast\)\(\dagger\) \\ \hline \multirow{4}{*}{BR} & S (N = 5) & 15.79 \(\pm\) 2.8 & 16.50 & 17.65 \(\pm\) 1.79 & 18.17 \(\ast\) & 17.15 \(\pm\) 4.85 & 15.75 \(\ast\) \\  & N (N = 8) & 16.47 \(\pm\) 4.4 & 15.33 & 20.87 \(\div\) 5.09 & 20.67 \(\ast\) & 22.50 \(\div\) 6.06 & 21.50 \(\ast\) \\ \cline{1-1}  & E (N = 7) & 17.69 \(\pm\) 4.9 & 15.67 & 22.29 \(\pm\) 4.69 & 24.00 & 25.69 \(\div\) 5.95 & 26.33 \(\ast\) \\ \hline \end{tabular}
\end{table}
Table 5: SampEn RR, SampEn SV, SampEn CO, SampEn BB, and BR in the three groups during rest, sub-max, and ACP stages.  
Figure 7: The results for SampEn BB ROC curve.