Bioimpedance plethysmography with capacitive electrodes and sole force sensors: comparative trial

Abstract Foot impedance plethysmography was implemented using two types of electrodes (dry and capacitive) sole force sensors. The latter are commonly used for assessing diabetic foot ulcers (DFU). For plethysmography, a tetrapolar configuration has been with three different plantar setups: four skin contact electrodes, capacitive Force Sensing Resistors (FSRs). In this work, FSRs have considered as possible because the top substrate contains interdigitating conductive semiconductive polymer. All measurements performed 1 mA/10 kHz excitation current tried under feet standing person to detect signals. Contact allow good cardiac pulse signal while through socks features mains interferences. sensing resistors their force-dependent resistance in parallel coupling, were not able pulse. But promising results can be anticipated from these findings provided higher frequencies larger sensor areas help altered states foot.