For the past few months, I’ve been wearing a Fitbit Sense smartwatch / fitness band ($ 228 on Amazon) to keep track of my exercise routines, pulse rate, breathing rate, skin temperature, oxygen satisfaction when sleeping, and “stress levels”. resting heartbeat and heartbeat

Larry Magid (Gary Reyes / Mercury News)

rate variability (HRV). This last metric shows a change in the time between heartbeats and, according to Fitbit, “higher HRV is associated with better health.” Like the Apple Watch, Sense can also be used to find out if there is an irregular heartbeat through the EKG (electrocardiogram) function.