It could skew heart rate and blood pressure tracking.
Light sensors used to track heart rate in wearable devices like the Apple Watch Series 5 and the Fitbit Versa 2 don’t work as well on darker skin or people with obesity, according to modeling done in aThat’s a problem for features currently built into devices — but it’s also a bad sign for efforts to use light sensors for new applications in wearables, like
“As we increased the BMI level and increased the skin tone, the signal diminished, and then other features started disappearing as well,” she says. The Fitbit, which had fewer sensors, had a more dramatic loss of signal than the Apple Watch, the study found. But the problems revealed by analyses like this complicate projects looking to use wearables to track cardiovascular health for underserved groups, Ramella-Roman says. The new study indicates researchers have to be careful using PPG, particularly for projects aiming to use the devices to help monitor people at higher risk of cardiovascular issues — which includes people with obesity. “The holy grail in this context is looking at blood pressure,” she says.
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