## 4 Discussion  
To understand the dynamics of the force during the single set analyzed for the two Scott machine loads, a 1 RM calibration was performed first, and in the second phase, the main parameters of interest were: volume/repetition range, load and manner of execution. There are very complex intercorrelations between these parameters, which depend on the training strategy and the selection of exercises. The tests were performed for two loads on the Scott machine which, through the execution mode, offer more interesting dynamics of force evolution in the concentric phase. It turns out that when the load was reduced to 50%, a significantly higher number of repetitions was obtained but there was a slightly longer duration of the set  
The evolution of the maximum forces per cycle in the case of a 10 kg load had good regularity of frequency and amplitude and, after that, the maximum force had a decrease, followed by a return near the end of the set in which the subjects tried to add an additional repetition by forcing the speed of execution. For a 50% reduced load, the dynamics of the maximum forces per cycle demonstrated much better regularity, suggesting better execution accuracy. In the case of a 10 kg machine load, some differences can be observed between the first and last relevant repetition. It can be noticed that the time taken to reach the maximum \begin{table}
\begin{tabular}{l l l l l l} \hline \hline  & **M** & **SD** & \(t\) & **df** & \(p\) \\ \hline R2\_Fmax 10 kg-R2\_Fmax 5 kg & 0.05 & 0.008 & 34.23 & 29 & \(\leq\)0.001 \\ \hline R24\_Fmax 10 kg-R39\_Fmax 5 kg & 0.047 & 0.011 & 23.009 & 29 & \(\leq\)0.001 \\ \hline \hline \end{tabular}  
M—mean; N—number of subjects; SD—standard deviation; \(t\)—\(t\)-\(t\)-value; df—degrees of freedom; \(p\)—level of significance.  
\end{table} 
Table 6: Paired-samples test for initial and final repetition for 10 kg and 5 kg, respectively. Figure 10: MNR vs. %1 RM. value of the force was longer at the beginning. Additionally, the ascending slope was less inclined in R2, which proves that, towards the end, a fatigue threshold was reached, which caused an increase in the execution speed in the concentric phase of the repetition cycle. For a 50% reduced machine load, there was a 14% decrease in the time taken to reach the maximum force, highlighting the role of compensatory acceleration for the two different Scott machine loads. In the case of 5 kg machine load, the frequency of the repetitions was increased, which highlights that, due to the aim of obtaining as high an MNR value as possible, there was a tendency to increase the speed of execution. It was observed that, in the case of a reduced load, the impulse developed at the final repetition was about 29% higher than in the case of the initial repetition, demonstrating that for reduced intensities within small muscle groups the subjects forced an additional repetition with the help of other muscle groups. Additionally, the data collection method offered a simple way to understand the correlations between the MNR and intensity %1 RM in the MNR single-set strategy in the case of Scott machine bicep curls. Particularly interesting features were observed in these unique sets using the MNR strategy. A correlation between the intensity of %1 RM and the MNR for the two machines was also drawn for the two machine loads, which highlighted an approximation in terms of the intensity and duration of execution, even if the MNR differed significantly. Therefore, we confirmed that the hypotheses were validated by the analyzed results. The analysis led to the identification of innovative strategies capable of manipulating the intensity factors and boosting the efficiency of the exercises based only on small, intelligent changes to the set-up. The first strategy would be drop-set MNR, respectively reducing the machine load after consuming 70-75% of the MNR with the maximum load and extending the MNR with the resulting lower machine load.