The Fitbit Community is a gathering place for real people who wish to exchange ideas, solutions, tips, techniques, and insight about the Fitbit products and services they love. By joining our Community, you agree to uphold these guidelines, so please take a moment to look them over.
Last night my Charge 6 couldn't measure heart rate variability, but still calculates a daily readiness score, which is a sum score that takes heart rate variability into account. For the calculation, Fitbit sets the heart rate variability to 0, which is wrong because it's actually missing, and thus comes up with a very low daily fitness index.
