Let me share with you the results of a new study published in the Journal of Senses,

comparing the accuracy of six different fitness trackers worn by healthy adults, including

Woop, Garmin, Aura, Polar and Apple.

The study was specifically interested in looking at the validity of measurements for sleep,

heart rate and heart rate variability, a marker of recovery.

Importantly, this was an independent study by a group of researchers in Australia, with

no funding or input from the fitness tracker companies.

So what's validity?

Well, compared to gold standard testing, which can be expensive, inaccessible and time-consuming,

such as an ECG for heart rate and heart rate variability, and polysomnography for sleep,

how accurately do these fitness trackers measure the things they claim to?

Not adding the fitness trackers against these gold standard tests is exactly what this study

set out to do.

So what did they find?

For measuring heart rate and heart rate variability, Woop performed best of all six trackers, with

99% accuracy for heart rate and 99.7% accuracy for heart rate variability.

And along with Aura and Somfit, Woop performed the best for accurately measuring the different

stages of sleep overnight, light, deep and REM sleep.

While you really cannot go wrong with any of these devices, haven't been wearing Woop

for three plus years now, it's nice to know that the data it's providing is valid.

That is, the Woop fitness tracker is actually measuring what it says it is, and thus the

changes I'm making to my lifestyle are therefore hopefully more effective in improving my health

...