# Analysis of the Influence of the Angular Position of the Clean in Kinematics and Kinetics
## 4 Discussion  
The objective of this study was to study the variations in the ranges of movements at the level of the pelvis, hip, knee and ankle, as well as to analyse the changes in the recording related with the power developed by the cyclist's limb when modifying the position of the cleat at the rotational level. Although the speed can be constant during seated pedaling, the forces generated in pedaling fluctuate broadly [32]. The main reason for this is that the muscular force produced depends on the muscle length and therefore on the range of articular movement [33]. Given that the articular ranges change during the pedaling movement and that the lever of each muscle depends on the position of the rod relative to the segment of the leg, the forces applied on the pedal vary through that coupling. Studies do not exist that have evaluated the influence of the modification of the rotational position of the cleat in cyclists. [PERSON] et al. [12] determined that with pedals that had freedom of movement ABD-ADD of 15\({}^{\circ}\) the varus-valgus moments and the rotation in the knee were reduced. Aligning all the cleats with the shoe's axis is incorrect as this depends on the parameters of the lower limb [19]. [PERSON] et al. [19] developed a formula through which, and taking into account certain rotational and torsional parameters of the cyclist's lower limb, they were able to adjust the angular position of the cleat. Allowing freedom in the transverse plane decreases the moments in the knee, but also the power that can be applied to the pedal. The minimum values we obtained with our utility model were also double those of the cleats that the cyclists brought. Likewise, the average values obtained with the prototype were greater in all cases. This type of pedal, which allows some degree of freedom between the shoe and the pedal, causes the muscles to spend part of their energy controlling the kinematics. When the cyclist uses a pedal with any degree of freedom between the parts, all the action of the muscles is applied to down the pedal, but if the adjustment is wrong, the joints can develop lesions. When analyzing the results obtained with the power systems, we can see that there are differences when comparing the recordings with the cleat itself with the different situations of study, both globally and when analyzing each of the systems separately. Investigations have demonstrated that the propulsive force could be between 40-60% [34; 35; 36] of the total and that it can vary according to factors such as the position of the body, the load, rhythm and fatigue, and others [37]. The average of the power with the cleat was 122.87 and the average of the best position with the prototype was 143.2, a 16.5% increase. This is a significant value if we consider the high intensity of this sport. Some improvement is interesting if we are to obtain the objectives. \begin{table}
\begin{tabular}{l c c c c} \hline \hline \multirow{2}{*}{**Variable**} & **ANOVA** & \multicolumn{3}{c}{**Student \(t\)-Test**} \\ \cline{2-5}  & **Global** & **Pioneer** & **PowerTap** & **Rotor** \\  & **(\(n\) = 34)** & **(\(n\) = 13)** & **(\(n\) = 12)** & **(\(n\) = 9)** \\ \hline AVG\_Power\_Right\_0 & 0.04 & 0.44 & \textless{}0.01 & 0.02 \\ AVG\_Power\_Right\_2 & 0.02 & 0.17 & 0.17 & 0.01 \\ AVG\_Power\_Right\_4 & 0.03 & 0.03 & 0.08 & 0.01 \\ AVG\_Power\_Right\_6 & 0.01 & 0.02 & 0.21 & 0.02 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Contrast tests for the power. The lower limb is the main focus of attention as it is the lever in charge of generating power through muscular actions. Given the above, it is demonstrated that the modification of the rotational position of the cleat influences the power generated at the level of the pedal. With respect to the kinematic parameters, it is also demonstrated that the modification of the position of the cleat generates significant changes in almost all the planes of the articulations studied. With respect to the pelvis, [PERSON] et al.