Stress Doctor by Azumio (Free iPhone App)

Stress Doctor visualizes respiratory sinus arrhythmia (RSA) which, in layman’s terms, is the rising and falling of your heart rate when you breathe in and out. When you inhale, pressure in your chest drops and consequently your blood pressure drops as well. Your autonomous nervous system (ANS) instantly increases your heart rate to compensate for this. A couple seconds later, the other systems for blood pressure regulation kick in and your heart rate starts to fall back to your baseline.

About App Updates