Equation 1: TEE = BMR + Thermic effect of food + Physical activity
1. BMR
BMR = Basal Metabolic Rate (BMR) = Basal metabolic rate. The amount of energy required for the heart, lungs, and other organs to function, i.e., the energy needed to keep the body running. People of roughly the same body size and muscle mass have roughly the same BMR. Women have a slightly lower BMR than men.
Women 18–30: 16.7 x V + 496,
Women 30–60: 8.7 x V + 829
Men 18–30: 15.3 x V + 679
Men 30–60: 11.6 x V + 879
The average value is 1,800 kcal per day.
2. MET value – a measure of the energy expenditure associated with various activities.
3. PAL – average value for all activities per day.
Calculate the total energy requirement over a 24-hour period. BMR serves as the baseline. Different types of activities require different amounts of energy. The thermogenic effect of food.
Different activities have different MET values, and as mentioned, MET is a measure of approximately how much energy is expended during the activity.
Equation 2: TEE (Total MET/24h) = PAL × BMR
When calculating how much energy is expended during a particular activity, you must take into account the duration and intensity of the activity.
What determines energy demand?
- Basal energy requirement
- Physical activity
- Thermogenesis
- Growth