the.com/stress monitoring
a smartwatch measuring your cortisol so you don't have to admit you're stressed.
means tracking physiological signals like heart rate variability, skin temperature, and sleep to estimate how frazzled a body actually is.
from grew out of biofeedback research in the 1960s-70s, then got miniaturized and monetized once wearables put sensors on every wrist.
main proxyheart rate variability, not heart rate itself
irony alertchecking the app can spike the stress it measures
military rootsearly versions tracked soldier fatigue and cognitive load
sleep linkmost algorithms lean heavily on overnight recovery data