## 3 Results
### Transmissibility  
Differences between body sites (F = 311.13, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.942) and postures (F = 205.20, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.915) but not between \(f_{set}\) (F = 1.55, \(p\) = 0.23, \(\eta_{p}^{2}\) = 0.075) were identified. When it comes to interactions, differences in body sites \(\times\)\(f_{set}\) (F = 39.65, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.676), body sites \(\times\) postures (F = 115.60, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.859), \(f_{set}\)\(\times\) postures (F = 9.33, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.329), and body sites \(\times\)\(f_{set}\)\(\times\) postures (F = 16.12, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.459) were identified. Overall, the \(T\) detected amplifications at AN and KN and attenuations from the HI to HE, although from the AN upward shows a decrement (Figure 4). In addition, it should be noted that a strong decrease occurred at HI (AN, 1.97 \(\pm\) 0.10, 95% CI: 1.762-2.180; KN, 1.37 \(\pm\) 0.07, 95% CI: 1.365-1.653; HI, 0.16 \(\pm\) 0.01, 95% CI: 0.149-0.174; L3, 0.142 \(\pm\) 0.01, 95% CI: 0.130-0.153; HE, 0.17 \(\pm\) 0.01, 95% CI: 0.151-0.188) and a minor effect of \(T\) occurred as it moved up from the HI to the HE (HI-L3, \(p\) = 0.017; L3-HE, \(p\) = 0.109; HI-HE, \(p\) = 1). Posture comparisons showed an increase in \(T\) at ER, HS, DS, and LU (TS, 0.36 \(\pm\) 0.02, 95% CI: 0.320-0.397; ER, 0.83 \(\pm\) 0.04, 95% CI: 0.753-0.909; HS, 0.90 \(\pm\) 0.04, 95% CI: 0.822-0.971; DS, 0.93 \(\pm\) 0.04, 95% CI: 0.851-1.012; LU, 0.94 \(\pm\) 0.04, 95% CI: 0.853-1.016).  
Conversely, non-significant effects were found between ER-HS (\(p\) = 0.098) and DS-LU (\(p\) = 1).  
Signal Purity Outputs  
Data revealed statistically significant effects between body sites (F = 73.71, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.795), \(f_{set}\) (F = 46.42, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.710), postures (F = 89.15, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.824), and its interactions body sites \(\times\)\(f_{set}\) (F = 15.54, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.450), body sites \(\times\) postures (F = 75.41, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.799), \(f_{set}\)\(\times\) postures (F = 7.00, \(p\) < 0.001, \(\eta_{p}^{2}\) = 0.269), and body sites \(\times\)\(f_{set}\)\(\times\) postures (F = 3.40, \(p\) = 0.002, \(\eta_{p}^{2}\) = 0.151).  
Overall, \(P_{out}\) was well-retained (Table 2), especially AN and KN that were over 96%. Although the \(P_{out}\) displayed a worse retention from the HI to the HE, this was over 80%, despite a few exceptions in TS and LU (AN, 98.4 \(\pm\) 0.14, 95% CI: 98.13-98.72; KN, 98.0 \(\pm\) 0.21, 95% CI: 97.52-98.41; HI, 86.9 \(\pm\) 1.09, 95% CI: 84.64-89.19; L3, 86.0 \(\pm\) 1.51, 95% CI: 82.83-89.6; HE, 78.17 \(\pm\) 1.80, 95% CI: 74.39-81.92). Between \(f_{set}\), the \(P_{out}\) at 25 Hz (91.9 \(\pm\) 0.54, 95% CI: 90.77-93.03) was better retained, followed by 20 Hz (89.9 \(\pm\) 0.83, 95% CI: 88.15-91.60) and 30 Hz (86.7 \(\pm\) 0.98, 95% CI: 84.66-88.75). In posture comparisons, better \(P_{out}\) retention is observed at ER (98.3 \(\pm\) 0.12, 95% CI: 98.04-98.54), HS (93.5 \(\pm\) 0.72, 95% CI: 91.94-94.95), and DS (92.5 \(\pm\) 0.92, 95% CI: 90.60-94.43), and slightly less \(P_{out}\) retention at TS (83.8 \(\pm\) 1.44, 95% CI: 80.81-86.83) and LU (79.4 \(\pm\) 1.34, 95% CI: 76.48-82.30).