In the case of Google and Fitbit and its own VO2 Max scores known as cardio fitness score, it looks at resting heart rate, age, sex, weight and will provide more accurate scores when using your ...

When it comes to cardiovascular health, the Fitbit Charge does pretty well. It only slightly overestimates VO2 max and slightly underestimates heart rate (HR), but becomes more accurate with ...

This is significant because direct measurement of VO2 max typically requires a rigorous ... Best Apple Watch: which model should you buy? Best Fitbit: the Fitbit fitness tracker or smartwatch ...

Many of them are also packed with handy running features, including built-in GPS, VO2 max estimations, heart rate zones and fuelling reminders. With so many models to choose from, it’s important ...