Sensitivity analysis of Heuer´s method for motion-artifacts reduction in capacitive biopotential measurements

Capacitive biopotential measurements are susceptible to motion-artifacts (MA) due to the non-contact property of capacitive electrodes. Among the methods used to reduce MA, the two proposed by Serteyn et al. and Heuer et al. are based on analyzing the time domain behavior of the measurement system. Serteyn´s method only partially reduces MA, while Heuer´s method can completely remove MA with a reconstruction equation. However, it has not been investigated to what extent Heuer´s method can tolerate the inaccuracies in the parameters of the reconstruction equation. This is why we performed a sensitivity analysis on Heuer´s method using dynamic simulations in MATLAB with different inaccuracies added to the known reconstruction parameters. The results were compared to those of Serteyn´s method, showing that Heuer´s method becomes inferior to Serteyn´s method at a lower inaccuracy of parameters when the body static charge is higher.