## 3 Results
### Experimental Results  
Table 1 presents the descriptive data (mean \(\pm\) one standard deviation--1 SD) of the propulsive force and impulse generated by each hand in each section. Inferential analysis revealed a non-significant time and side effect, as well as a non-significant time X side interaction for both variables. This shows that the propulsive force and impulse did not change significantly between sections, and non-significant differences were observed between hands. Notwithstanding, both variables showed higher values at S15-20 m than at S10-15 m (but with a trivial effect size). Table 2 presents the descriptive data (mean \(\pm\) one standard deviation--1 SD) of the kinematic and kinetic variables by section. It also presents the comparison between sections. Figure 4: Example of a swimmer’s hand trajectory that can be analyzed in the Analysis Center. Suffixes 1 and 2 correspond to the left and right hand, respectively. Panels (**A**)—top view of the arm-pulls. Panels (**B**)—side view of the arm-pulls. Panels (**C**)—back view of the arm-pulls. Swimmers slightly increased their swimming velocity between sections (non-significantly with a trivial effect size). The same was observed for the other kinematic and kinetic variables. The \(\rm C_{Da}\) slightly decreased between sections (trivial effect size). The dv was the only variable that presented a significant change (decrease, i.e., suggesting better performance but with a small effect size). Table 3 presents the fixed effects of the final computed model, keeping only the significant determinants. The \(\rm C_{Da}\) was the variable with the highest contribution to the swimming velocity. A one-unit increase in the \(\rm C_{Da}\) imposed an increase of 0.593 m/s (95 CI: \(-\)0.636 to \(-\)0.550; \(p\) < 0.001) in the swimming velocity. That is, an increase of the \(\rm C_{Da}\) promoted a negative and significant effect on the swimming velocity. The other determinants had a positive (and significant) effect on the swimming velocity. That is, a larger SL and greater \(\rm F_{mean}\) (right and left) led to a faster swimming velocity. \begin{table}
\begin{tabular}{l c c c c c} \hline \hline  & \multicolumn{2}{c}{**Mean \(\pm\) 1 SD**} & \multicolumn{2}{c}{**Time**} & \multicolumn{2}{c}{**Side**} & \multicolumn{2}{c}{**Interaction**} \\  & **S10–15 m** & **S15–20 m** & **F-Ratio (_p_)** & **F-Ratio (_p_)** & **F-Ratio (_p_)** & **F-Ratio (_p_)** & **d [Descriptor]** \\ \hline \(\rm F_{mean,right}\) [N] & 23.87 \(\pm\) 4.87 & 24.17 \(\pm\) 5.13 & 0.472 (0.498) & 1.794 (0.191) & 0.002 (0.961) & 0.06 [trivial] \\ \(\rm F_{mean,left}\) [N] & 27.03 \(\pm\) 7.27 & 27.29 \(\pm\) 8.15 & & & & 0.03 [trivial] \\ \(\rm Imp_{right}\) [N-s] & 19.82 \(\pm\) 5.00 & 20.02 \(\pm\) 5.49 & 0.520 (0.477) & 1.249 (0.273) & 0.044 (0.835) & 0.04 [trivial] \\ \(\rm Imp_{left}\) [N-s] & 22.45 \(\pm\) 6.61 & 22.62 \(\pm\) 7.58 & & & & 0.02 [trivial] \\ \hline \multicolumn{6}{c}{\(\rm F_{mean,right}\)--mean propulsive force generated by the right hand; \(\rm F_{mean,left}\)--mean propulsive force generated by the left hand; \(\rm Imp_{right}\)--impulse generated by the right hand; \(\rm Imp_{left}\)--impulse generated by the left hand; \(p\)—significance value.} \\ \end{tabular}
\end{table} 
Table 1: Descriptive data (mean \(\pm\) one standard deviation—1 SD) of the propulsive force generated by hand in each section. It also presents the time effect (arm-pull difference between sections), side effect (difference between the propulsive force generated by both hands), and the respective interaction.