. Author manuscript; available in PMC: 2021 Nov 1.

Published in final edited form as: IEEE Sens J. 2020 Jun 8;20(21):12859–12870. doi: 10.1109/jsen.2020.3000772

TABLE I.

Biosensors of Empatica E4, Biosignals and Example Indicators

Sensor	Biosignal	Example Indicator
Infrared Thermopile	ST	Increased with resistance exercise [60], fall during biking exercise [59]
PPG	BVP	Alteration during bike exercise, noise (motion artifact) increase during any kind of physical activity
3-D ACC	ACC	Intensity of running, relatively stable during sedentary state and bike
PPG	HR	Increased during running, bike and resistance exercise, stable during sedentary state
GSR	GSR	Capturing sweating rate, intensity of daily activities, bike or running