Lecture 6. Energy Stores and Whole Body Energy Balance. Intake and Expenditure. Fuel oxidation rate is beautifully matched to ATP demand Well coupled at the molecular level But fuel intake is totally mismatched from ATP demand Ie, we don’t eat at the same time as we consume energy!
Energy Stores and Whole Body Energy Balance
The only factor omitted by the Harris Benedict Equation is lean body mass. So it is quite accurate in all
but the very muscular (where it will under-estimate BMR) and the very fat (will over-estimate BMR)
Multiply by 4.184 to get into kJoules.
Multiply BMR by the appropriate activity factor:Sedentary (little or no exercise) : = BMR x 1.2 Lightly active (light exercise/sports 1-3 days/week) : = BMR x 1.375 Moderatetely active (moderate exercise/sports 3-5 days/week) : = BMR x 1.55 Very active (hard exercise/sports 6-7 days a week) : = BMR x 1.725 Extra active (very hard exercise/sports & physical job or 2x training) : = BMR x 1.9 Note how the activity doesn't make as much difference as you might expect.
See also Frayn Table 8.4 for a list of how various activities increase metabolic rate.