To recap this thread.
Goal was to be able to use WFS to make a Watch Face that could be read at night by a person with low vision to alert them of possible heart irregularities like Tachycardia and aFib and Blood Oxygen Level…
The watch in question is a Mobvoi TicWatch Pro 5.
The watch has the ability to detect these conditions but they are not activated because the watch has not been certified by the US FDA.
BUT, It can be programmed through settings to:
- Continuously monitor HR during exercise periods and alarm if the HR exceeds 155 BPM. By selecting an exercise that doesn’t require a “goal/end time”, the watch can be effectively set to continuously monitor for and alarm for Tachycardia.
In addition, the watch can be set such that the LOW POWER SCREEN changes color based on heart rate and this is my best way to easily see my HR. - BO2 can be set such that it continuously (actually records a reading every 15 minutes) monitors O2 level during sleep periods and the sleep schedule can be set to run for 23 hrs a day. Thus giving nearly continuous display of current BO2 level subject to the watch requirement that the wearer be nearly motionless for about 2 minutes while the measurement is being taken.
- Monitoring for aFib is significantly more difficult. I have attempted to use the “STRESS MEASUREMENT” as a proxy since the watch can be set to measure stress every 15 minutes subject to being physically still for the about 2 minutes needed to do the measurement.
Stress is measured using the Heart Rate detector and it measures what is called “Heart Rate Variability”.
Low HRV = HIGH STRESS
HRV is affected by several different things other than Physical Activity and emotional state.
Most notably Blood Pressure especially Diastolic which can vary because of medical conditions unrelated to Physical Activity and emotional state.
Most of the medications that are prescribed for either Tachycardia or aFib are actually BP medications that LOWER BLOOD PRESSURE.
HRV is highly inversely affected by diastolic blood pressure and my records seem to confirm that.
Diastolic blood pressure down = HRV UP = STRESS DOWN
It appears that aFib causes baseline HRV to be higher. High HRV = Low Stress and again my records seem to support that.
Because I have lost lung function due to disease, moderate exercise causes my respiration rate to increase and that likely lowers HRV causing HIGHER STRESS reading.
Tachycardia without arrhythmia, like anything that causes higher BPM results in lower HRV which the watch reads as HIGH STRESS and again my records seem to confirm that.
I have concluded that any time the watch displays either a VERY low reading (<20) or a high reading (>80), I need to get my BP Cuff out and get an accurate measurement.
I will mark this SOLVED but I actually think what I wanted to do is beyond the capability of WFS because Mobvoi/TicWatch has made some things only accessible via their proprietary Design Tool TimeShow and only then if you pay to use it.