1. Physiological parameters

In order to develop wearable solutions, it is necessary to characterize a number of physiological parameters using the methods described in this section. The order of magnitude of these parameters is given in table 1 . Based on electronic, mechanical (piezoelectric, piezoresistive, capacitive transducers), optical or electrochemical principles, numerous sensors have been developed and can be integrated into wearables for the non-invasive measurement of vital signs. [R 400]