Smartwatches can catch COVID-19 a week before symptoms?

A study published by researchers from Mount Sinai in New York found the Apple Watch is capable of detecting COVID-19 in the wearer up to a week prior to clinical diagnosis. It involves measurement and monitoring of heart rate variability (HRV) using a companion app. The study's corresponding author Robert P Hirten has previously used HRV to predict flare-ups in inflammatory bowel disease patients.

source https://www.newsbytesapp.com/news/science/wearables-can-detect-covid-19-week-before-symptoms-appear/story