Those watches compare ecg to blood pulse arrivals. If, like most watches they don’t measure blood pulse very well… and most on amazon require user to manually hold the watch. Still tech is something to look forward to.
I have the abpm50 from contec medical systems and a few attempts do not seem to show much useful data. It does interrupt me at specific intervals. Blue is HR. This is over month.
It was difficult to follow all the instructions.
Notes from Measure Your Blood Pressure | cdc.gov and others. Wrist and finger monitors are not recommended because they yield less reliable readings. Choose a monitor that has been validated Association for the Advancement of Medical Instrumentation, the British Hypertension Society and the International Protocol for the Validation of Automated BP Measuring Devices.
Calibrate device against doctor’s model.
(ignoring)Measure at the same time every day.
“Factors that can affect blood pressure include: stress, smoking, exercise, cold temperatures, a full stomach, a full bladder, caffeine, sleep, and some medications.”
Relax five minutes before. No clothes between you and cuff.
Center cuff on Heart level, just above nipples.
Make sure the bottom of the cuff is placed directly above the bend of the elbow.
Sit straight in dinner chair with back feet arm supported and flat. Legs uncrossed.
Relax. No talking or movement. Breathe and don’t take deep breaths.
3 measurements 2 min apart.
“If you can wiggle the two fingertips under the top edge but cannot wedge your full fingers beneath the cuff, the cuff is tight enough. If you can wedge your full fingers under the cuff then you need to open up the cuff and pull it tighter before closing it again.”