Tom Kindlon
Senior Member
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Somebody suggested to me today this could be useful either for individuals or as part of research so I thought I would throw it out there.
https://humon.io/
https://humon.io/
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I looked at both the articles you cited. The second one states that fitness trackers like Fitbit are surprisingly accurate as to heart rate, but fail abysmally as to energy expenditure. However, from what I can tell, Fitbit and related devices measure energy expenditure (calories expended) in this way:Seems that the accuracy of such devices is questionable: https://newatlas.com/humon-hex-muscle-oxygen-wearable/52850/ and https://newatlas.com/fitness-tracker-data-accuracy-study-stanford/49699/
It might have a use in measuring changes in an individual's blood status, but I wouldn't use the numbers it provides for anything scientific at this point. The mood ring of 1975 showed changes too.
https://help.fitbit.com/articles/en_US/Help_article/1381/?q=how does fitbit flex measure energy expenditure&l=en_US&c=Products:Force&fs=Search&pn=1The calorie burn estimate that Fitbit provides takes into account your BMR, the activity recorded by your tracker, and any activities you log manually.