The number of respiratory cycles you complete per minute (rpm). A respiratory cycle is the entire inhalation (breathing in) and exhalation (breathing out) from your lungs. Values can range from 15-20 respiratory cycles at rest.

Why Measure:

Tracking your RR multiple times per day with Ember may help you understand the impact exercise has on your respiratory cycle and provide feedback on how effective your breathing becomes over time.

PVI is the variation in perfusion index over your breathing cycle. Changes in PVI may indicate changes in hydration, breathing effort, perfusion, or other factors.

Why Measure:

It is suggested to measure PVI in the same body position, remaining still and without talking, at the same breathing rate and depth of breathing. An increase in PVI may indicate a decreased level of hydration, increased breathing effort, or other factors. A decrease in PVI may indicate an increased level of hydration, decreased breathing effort, or other factors. Multiple factors other than hydration and breathing effort can affect PVI, including breathing rate, depth of breathing, body position, body movement, vascular tone, blood flow to the finger (perfusion index), normal variation within a short-term monitoring session, waveform shape changes, and/or cardiovascular abnormalities.