Thermogenisis

[pezajuste]

Does anyone know how the versa takes into account calories burned due to thermogenesis?

[Rich_Laue]

Fitbit has no way of measuring your bodies temperature, if that is what your asking. 

[LZeeW]

@pezajuste  Fitbit is said to use the Mifflin St Jeor equation for estimating resting metabolic rate.  Your RMR includes all those functions your body uses at rest -- heart, brain, lungs, digestion, etc., and thermogenesis.  It is, of course, an estimate.  So it is derived using typical normal conditions, not the extremes.

So, yes, thermogenesis is definitely included.

[pezajuste]

Thanks for the input. It's my understanding that BMR, what I believe the Mifflin St Jeor equation is calculating, does not include TEF ( Thermogenic Effect of Food ) which is what I was asking about. Below is an excerpt I took out of an ACE article regarding BMR:
Metabolic rate represents the number of calories needed to fuel ventilation, blood circulation, and temperature regulation. Calories are also required to digest and absorb consumed food and fuel the activities of daily life. Or put another way, metabolic rate is an estimate of how many calories you would burn if you were to do nothing but rest for 24 hours. It represents the minimum amount of energy required to keep your body functioning.
I'm guessing that Fitbit just uses a multiplier to the Mifflin St Jeor results to estimate TEF but also thought it would be cool if they actually looked at the food consumed and calculated the TEF more accurately. Unlikely, but would be impressive.
Thanks again for your thoughts. 




Fitbit is said to use the Mifflin St Jeor equation for estimating resting metabolic rate.  Your RMR includes all those functions your body uses at rest -- heart, brain, lungs, digestion, etc., and thermogenesis.  It is, of course, an estimate.  So it is derived using typical normal conditions, not the extremes.

[pezajuste]

My bad … I should have been clearer. I should have said TEF ( Thermogenic Effect of Food ) = how much energy is used to absorb the food we eat. 

[LZeeW]

@pezajuste   According to this article, from Sports Health, none of the commonly used equations for RMR/BMR make any adjustment for the thermogenic effect of food.