An inexpensive alternative to determine an individual's RMR is by estimating the same RMR using prediction equations.
The more precise metric is BMR.
First, the RMR increases as body weight increases, whereas the energy requirement per unit weight decreases as body weight increases, according to studies comparing BMR and RMR. However, the difference between the two is less than 10%.
RMR is usually measured after a 4-8 hour fast, but on the other hand BMR is usually measured after a 14-18 hour fast.
As a result, if the weight in case of a human increases from 40 to 160 kg, the RMR per kilograms body weight decreases from 30 to 15 kcal kg-1 per 24 h.
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