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by suprathreshold 3610 days ago
Maybe bargl means Bioelectric Impedance Analysis? A cursory internet search also indicates BIA is suspect as a one-time measure.
1 comments
bargl 3610 days ago
OK so I have this and I thought that the BMI it computed was based on tracking the fat to everything else based on BIA. But I may be way off here.

https://www.fitbit.com/aria

I see that Fitbit tracks this as BodyFat % not BMI. Not sure if that's accurate.

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raffy 3610 days ago
BIA is pretty bad. Here are ~1300 Fitbit Aria measurements matched against 7 DXA scans. The Fitbit bodyfat data (teal) is just random noise and can barely detect considerable changes in body composition.

http://i.imgur.com/J4Ls2bQ.png

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