Heart-rate-variability biofeedback

In patients with heart disease it took systolic pressure down 3.08 mmHg and diastolic down 3.23 mmHg.

Also called HRV

Who it's forAny man with a smartwatch and a blood-pressure reading he doesn't like.

The item

Three squares: proven in human trials. Two: a strong signal. One: early human data. Striped: the trials disagree.

Emergency: call 911.

I am not a doctor. This is not medical advice. This is self-education. Talk to a physician who has your history before you change anything.