## 2 Materials and Methods
### Evaluation of Muscle Force
In the same context, we also made a Pearson correlation between the parameters (Tables 15-17). In Tables 18-20 we present the p values for Pearson coefficients that are presented in Tables 15-17. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Score SQS (Intervals)**} & **EGS Average** & **EGD Average** & **FGS Average** & **FGD Average** \\  & **Duration of** & **Duration of** & **Duration of** & **Duration of** \\  & **Maintained Maximal** & **Maintained Maximal** & **Maintained Maximal** & **Maintained Maximal** \\  & **Muscle Force (s)** & **Muscle Force (s)** & **Muscle Force (s)** & **Muscle Force (s)** \\ \hline
20–30 & **1.41** & 1.09 & **1.53** & 1.23 \\
31–35 & 1.19 & 1.21 & 1.26 & 1.03 \\
36–40 & 1.07 & 1.08 & 1.22 & 0.90 \\
40–45 & 1.19 & 1.12 & 1.09 & **1.28** \\ \(>\)45 & 1.18 & **1.24** & 1.02 & 1.18 \\ \hline \hline \end{tabular}
\end{table} 
Table 13: Correspondence between each SQS score group and average duration of maintained muscle force (knee flexors and knee extensors). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Parameters**} & **Medium** & \multirow{2}{*}{**Maximal Force**} & \multicolumn{2}{c}{**Duration of**} & \multirow{2}{*}{**Medium**} & \multirow{2}{*}{**Maximal Force**} & **Duration of** \\  & **Maximal Force** & & **GES-FGD** & & **Maximal Force** & **GES-FGD** & **Maintained Force** \\  & **EGS-FGD** & & & **EGS-FGD** & & **EGS-FGD** & **GES-FGD** \\ \hline Difference & 23.989 & 30.234 & \(-\)0.067 & 19.898 & 21.002 & 0.058 \\ \(p\)-value & **0.006** & **0.001** & 0.597 & **0.016** & **0.001** & 0.619 \\ (Two-tailed) & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \\ \hline \hline \end{tabular}
\end{table} 
Table 12: Statistical results for agonist/antagonist muscles. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Score SQS (Intervals)**} & **EGS Average** & **EGD Average** & **FGS Average** & **FGD Average** \\  & **Duration of** & **Duration of** & **Duration of** & **Duration of** \\  & **Maintained Maximal** & **Maintained Maximal** & **Maintained Maximal** & **Maintained Maximal** \\  & **Muscle Force (s)** & **Muscle Force (s)** & **Muscle Force (s)** & **Muscle Force (s)** \\ \hline
20–30 & **1.41** & 1.09 & **1.53** & 1.23 \\
31–35 & 1.19 & 1.21 & 1.26 & 1.03 \\
36–40 & 1.07 & 1.08 & 1.22 & 0.90 \\
40–45 & 1.19 & 1.12 & 1.09 & **1.28** \\ \(>\)45 & 1.18 & **1.24** & 1.02 & 1.18 \\ \hline \hline \end{tabular}
\end{table} 
Table 13: Correspondence between each SQS score group and average duration of maintained muscle force (knee flexors and knee extensors). \begin{table}
\begin{tabular}{l c c c c c c} \hline \hline
**Variables** & **EGS** & **EGS** & **EGS** & **EGD** & **EGD** & **EGD** \\ \hline EGS Medium maximal muscle force (N) & \(\mathbf{1}\) & \(\mathbf{0.841}\) & \(0.086\) & \(\mathbf{0.803}\) & \(\mathbf{0.870}\) & \(-0.240\) \\ EGS Maximal muscle force (N) & \(\mathbf{1}\) & \(0.051\) & \(\mathbf{0.757}\) & \(\mathbf{0.879}\) & \(-0.230\) \\ EGS Duration of maintained maximal muscle force (s) & & \(\mathbf{1}\) & \(0.078\) & \(0.121\) & \(0.374\) \\ EGD Medium maximal muscle force (N) & & & \(\mathbf{1}\) & \(\mathbf{0.925}\) & \(-0.114\) \\ EGD Maximal muscle force (N) & & & & \(\mathbf{1}\) & \(-0.214\) \\ EGD Duration of maintained maximal muscle force(s) & & & & & \(\mathbf{1}\) \\ \hline \end{tabular} The bold values are different from 0 with a significance level \(\alpha=0.05\).  
\end{table} 
Table 15: Pearson correlation between muscle parameters of left and right knee extensors.