## 3 Results  
Surface EMG signals from the six muscles or muscle heads, obtained from ten healthy subjects, are used in this paper to compare the results of ICrA, PCA, and SCA. The sEMG data for participants one and ten (P1 and P10) are presented in Figure 2. The sEMG data for the rest of the volunteers will not be shown here to avoid the repetition of similar figures. The sEMG data for Delcla, Delspi, BIC, TRI, ANC, and BRA for the flexion and extension phases with different durations with or without an added load were processed by ICrA, PCA, and SPA. Two IMs consisting of the criteria and objects were created for each participant (from P1 to P10). Eight flexion or extension phases were the criteria. The calculated areas under the obtained curves of the EMG signals for the six muscles or muscle heads were the objects. The results in the form of heat maps for twenty-eight flexion or extension phases' pairs after ICrA application are given in Tables 1 and 2. The purple colors, from light to dark, denote weak, only positive, and strong positive consonance. The grey colors, from light to dark, are used for weak, only dissonance, and strong dissonance. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Flexion** & **P\({}_{1  
According to the results presented in Table 1, a positive consonance (weak, only positive, and strong) was observed for six participants (P1, P4, P5, P6, P7, and P8) for all their twenty-eight flexion phases' pairs. For the remaining four participants (P2, P3, P9, and P10), IcrA detected dissonances for some of the criteria pairs. The results given in Table 2 show the extension phases' pairs only in positive consonance (weak, only positive, and strong) for five participants (P4, P5, P6, P7, and P8). Dissonance for some of the criteria pairs was found for the same number of investigated subjects (P1, P2, P3, P9, and P10). Concerning the eight flexion/extension phases, ICrA found positive consonance between three criteria pairs for the same cyclic movements, namely fH1-fH1w, fH10w-fH6w, and fH2w-fH1w and eH1-eH2w, eH1-eH1w, and eH2w-eH1w. For the first two pairs of flexion and extension, weak, only positive, and strong positive consonance were observed, while for the third pair, only positive and strong positive consonances were detected. The interesting exception here is the pair eH10-eH6, which hit only positive and strong positive consonances for extension movements. In this article, a positive consonance indicates the existing trends (increasing or decreasing) found in the muscle activity behavior that determine the correlated phase pairs. The dissonance was interpreted with no trends in muscle activity for the phases. [PERSON]'s and Spearman's CAs were also applied for the same data matrices. The results for twenty-eight flexions and the same number of extension phases' pairs after using the \"CORREL\" function for PCA calculations are presented as heat maps in Tables 3 and 4. The purple colors from dark to light show perfect, very strong, and strong correlations. The gray colors from dark to light denote significant, weak, negligible, and no correlations, respectively. As can be seen from Tables 3 and 4, the PCA found strong, very strong, and perfect dependencies for five participants (P1, P4, P5, P6, and P7) when flexion is discussed, and for four participants (P4, P5, P6, and P7) when extension is in focus. Some values showed a smaller than strong dependence for the other five (P2, P3, P8, P9, and P10) and six participants (P1, P2, P3, P8, P9, and P10) for the flexion and extension phases. There were some flexion criteria pairs with negative dependences according to the PCA.