According to 9To5Google, Fitbit Labs is launching a blood pressure study this month to "potentially measure" Pulse Arrival Time (PAT), or the "time it takes for a pulse of blood to reach your wrist after your heart beats".
With the update, Charge 4 users will be able to access blood oxygen readings on the watchface, information that was previously available only through the app in sleep data.
Fitbit co-founder and CEO James Park said that the trust of Fitbit users will continue to be paramount, and they will maintain strong data privacy and security protections.
In a strongly-worded letter, the human rights NGO said that Google is "incentivised to merge and aggregate data across its different platforms" as a consequence of its surveillance-based business model.
This is 8 per cent increase (year-over-year), driven primarily by the introduction of higher priced smartwatches and consumer demand for its new smartwatch, the Fitbit Sense.
