Does anyone else’s Cardio Score change depending on their menstrual cycle?

[lorenma]

We have had discussions on here before about how most data is biased towards men and their biology but I’m surprised how little Fitbit takes the menstrual cycle into account, thoughts?

[LZeeW]

Hello @lorenma and welcome to the Community.  Fitbit reports the VO2max and fitness levels based on sex and age range.  On the surface, I have to say that the data isn't biased towards men.  I get a cardio fitness score for women my age.

With respect to menstrual cycle, I will share this information with you.  My background is physiology and I did a brief search of the physiology literature.  It is true that your individual VO2max can change with different phases of the menstrual cycle.  However, when you look at studies involving a larger number of women, the difference doesn't seem to be statistically significant.