There are some gadgets that promise to measure stress level (derived from pulse data?)
Most of the devices that offer such stress detection measure the change in the interval between heartbeats — a measure known as heart rate variability. (from a 2015 article)
The Wikipedia article on this measurement method does not reveal much on stress measurement.
How reliable is such indication/measurement, what to expect about false positives/false negatives?
- I feel stressed, gadget says no: have I thought up stress?
- I feel not stressed, gadget says yes: I can't notice stress?