Breathing rate measures the number of breaths you take per minute, also known as the rate of respiration per minute.
Scientific literature shows that breathing rate is higher in the luteal phase than in the follicular phase. Breathing rate can vary widely during the course of a day due to your activities, but typical breathing rates during sleep are much more stable, and range from 10 – 25 bpm.
The Ava Fertility algorithm uses breathing rate as one of the parameters to determine your fertility predictions.