Table 1.

Examples of commercial and R&D sensors for tracking vital signs and behavior [2]

Vital sign or behavior	Wearable location (form factor)	Environment location
Blood pressure	Arm (cuff)	Bed
	Wrist (watch) Chest (clothing)	Chair
ECG	Chest (phone case, clothing, necklace)	Bed
	Waist (belt)	Chair
Heart rate	Finger (ring)	Bed
	Ear (headset, earlobe clip)	Chair
	Chest (phone case)	Camera
	Nose bridge (glasses)	(face, mirror)
	Forehead (hat)
Pulse oximetry	Finger (ring, glove)
	Forehead (mounted sensor)
Blood glucose	Waist (device)
	Eye (contact lens)
EEG	Head (headset)
Breathing	Chest (device, vest)	Camera (face)
Sleep	Wrist (watch)	Bed, mattress
	Ankle (watch)	Bedside
	Head (headset)	Camera
	Chest (device)
Body temperature	Wrist (watch)	Camera
	Forehead (patch)
Motion	Wrist (watch)	Camera
	Ankle (watch)
	Foot (shoe)
	Leg (stocking)
	Waist (belt)
	Chest (necklace)