Bio Impedance Technology and Measurement Using Sensitized Garments- as Review

Abstract

Bio impedance has the potential for playing an important role in this scope, especially because of its relatively reliable, electrode-based sensing principle and its broad range of applications. On the other hand, there are also some challenges for the successful exploitation of this technique in a wearable device, like the reduction of power consumption and the control and optimization of the measurement for a specific application using a wearable electrode setup, more compact than the ones commonly employed in literature. The body fluid monitoring system comprises a custom-made handheld tetra polar bio impedance spectrometer and a textile-based electrode garment for total body fluid assessment. The implemented textile-enabled instrumentation contains one skin galvanometer, two temperature sensors for skin and environmental temperature and an impedance pneumographic containing a 1-channel ECG amplifier to record cardiogenic bio potentials. Through these such groupings of garments and non-invasive measurement devices, a multipara metric wearable measurement system has been implemented, to record the following physiological parameters: heart and respiration rate, skin galvanic response, environmental and peripheral temperature. To ensure the proper functioning of the implemented garments and devices the full series of 12 sets have been functionally tested recording cardiogenic bio potential, thoracic impedance, galvanic skin response and temperature values. The investigational results indicate that the realized wearable measurement systems operate according to the specifications and are ready to be used for mental stress experiments.