These look interesting; a wearable for monitoring heart and lungs during training and recovery.
Hexoskin Smart Shirts - Cardiac, Respiratory, Sleep & Activity Metrics
I have one (to try to investigate sleep issues).
It doesn’t seem like it is useful for cycling out of the box, as I haven’t found a way to integrate with other apps (e.g. to get power numbers).
The article below claims that integration with https://tapiriik.com/ would be possible, but I don’t see that option (I have just reached out to Hexoskin, and Tapiriik, and waiting for answers).