I've never seen an HRM strap attempt EKG data, at best they only track HRV which would be a single dimension instead of the two needed, basically fine resolution of timing between beats but not intensity/duration of beats.
But just to add to the knowledgebank, Wahoo makes probably the most interesting HRM strap right now that can not only store the HRV data for days but unlike Garmin straps the tickerX strap can record without any phone or watch starting or connected to it. If someone could hack it to also do 2-lead EKG for days that would be fascinating and probably very useful.
> The Exporter software provides access to raw data files for ECG, RR-I and ACC in CSV format
The fact firstbeat can do it virtually proves HRM straps could do EKG, the makers just don't want to support it and there are probably FDA complications with certifying that.
But just to add to the knowledgebank, Wahoo makes probably the most interesting HRM strap right now that can not only store the HRV data for days but unlike Garmin straps the tickerX strap can record without any phone or watch starting or connected to it. If someone could hack it to also do 2-lead EKG for days that would be fascinating and probably very useful.
Then there is the Firstbeat Bodyguard single node device which is too expensive to play with but fascinating: https://shop.firstbeatsports.us/collections/bodyguard-3-sens...
> The Exporter software provides access to raw data files for ECG, RR-I and ACC in CSV format
The fact firstbeat can do it virtually proves HRM straps could do EKG, the makers just don't want to support it and there are probably FDA complications with certifying that.