## 4 Discussion
\begin{table}
\begin{tabular}{l c c c c c} \hline \hline  & \multicolumn{2}{c}{**Maximum Torque**} & \multicolumn{2}{c}{**Maximum Velocity**} & \multicolumn{2}{c}{**Maximum Power**} \\ \hline  & **Estimate** & **\(p\)-Value** & **Estimate**\({}^{\circ}\)**/s** & \(p\)**-Value** & **Estimate** & **\(p\)-Value** \\  & **Nm/kg** & **\(p\)-Value** & **Estimate**\({}^{\circ}\)**Nm/s.kg** & **\(p\)**-Value** \\ \hline Intercept & 2.851 & \textless{}0.001 & 314.245 & \textless{}0.001 & 551.672 & \textless{}0.001 \\ Centred Age (25 years) & 0.001 & 0.890 & \(-\)3.593 & 0.015 & \(-\)6.491 & 0.214 \\ Gender (Female) & \(-\)0.044 & 0.590 & \(-\)5.494 & 0.677 & 8.563 & 0.856 \\ Lower Limb Laterality (Dominant) & \(-\)0.085 & 0.266 & \(-\)8.853 & 0.483 & \(-\)27.852 & 0.539 \\ Movement Type (Isometric) & \(-\)0.327 & \textless{}0.001 & \(-\) & \(-\) & \(-\) & \(-\) \\ Hamstring Motor Task (Hip Extension) & \(-\)1.535 & \textless{}0.001 & 202.38 & \textless{}0.001 & \(-\)89.569 & 0.051 \\ \hline \hline \end{tabular} Note 1. All voluntary data included (13 men and 7 women). Note 2. Motor tasks: knee flexion (MIKF and MVKF) as well as hip extension (MIHE and MVHE). Note 3. Movement types: isometric and concentric starting from 50% maximum torque. Note 4. For regression analysis, the central value of age is set at 25 years. Note 5. For the other variables, the reference is the value shown between brackets.  
\end{table} 
Table 3: Multivariate regression analysis of torque, velocity, and power. motor task (\(p<0.001\)) and the type of movement is associated with a significant difference (\(p<0.001\)). The second main result of the reported research refers to velocity. As shown in Table 2, the angular limb velocity deployed--starting at 50% of the maximum torque--is smaller in hip extension (215.96\({}^{\circ}\)/s) than in knee flexion (452.56\({}^{\circ}\)/s). This may be a consequence of the following concomitant factors:  
The quick movement of a hip extension (maximum velocity hip extension, (MVHE) starts at 50% of the previously recorded maximum isometric torque (Figure 2b). During this movement, the maximum torque obtained in such a condition (MVHE) does not differ between dominant and non-dominant limbs. With reference to Table 3, the normalized torque regression analysis shows no difference with gender (\(p=0.667\)) or limb dominancy (\(p=0.483\)). Velocity significantly varies with age, according to regression analysis (\(p=0.015\)), and the motor task is associated with a significant difference (\(p<0.001\)). This difference is 202.38\({}^{\circ}\)/s quicker in knee flexion with respect to hip extension, according to the regression analysis. With the values being weight normalized, there is no difference in torque due to gender. In these dynamic conditions, the maximum torque obtained is comparable to the maximum isometric torque, but not as large. By holding the elastic resistance band firmly from the initial 50% of the maximum force, the physiotherapist uses an increasing opposing force to activate the hamstring muscles up to, but not reaching, the maximum isometric torque. The maximum isometric torque is significantly larger than the dynamically deployed torque, acting against the stretching elastic resistance band. The difference is 0.327 Nm/kg, which is approximately 17% less with respect to the mean MIHE torque of 2.93 Nm/kg (Table 2). During hip extension (MVHE), we also measured the maximum velocity recorded at some time during the 80\({}^{\circ}\) span from the initial to neutral positions (i.e., zero degrees or limb against the mat) (Figure 2b). No statistically significant differences were found (Table 3) for maximum velocity, with respect to gender (\(p=0.677\)) and to dominancy of the limb (\(p=0.483\)). From Table 3, we also found an expected result in the sense of slightly faster movements by younger adults, with \(p=0.015\) dividing subjects as being below or above 25 years of age. The incremental velocity is of the order of 1% slower per year of age (\(-3.59\) out of 314.45\({}^{\circ}\)/s).