What is BMR and How is it Measured?
BMR, or Basal Metabolic Rate, is the amount of energy the body needs to function when at rest. It is a measure of the energy the body requires to sustain basic functions like breathing, regulating body temperature, and circulating blood. BMR is also known as Resting Metabolic Rate (RMR). It is measured in kilocalories (kcal) per day.

The Role of BMR in Daily Energy Expenditure
BMR is an important factor in calculating daily energy expenditure. Energy expenditure is the total energy used by the body to complete physical activities, including working, exercising, sleeping, and digesting. BMR is the most basic part of energy expenditure and accounts for roughly 60-70% of the body’s daily energy needs. The remaining 30-40% is known as active metabolic rate and is broken down into physical activities, thermoregulation, and internal work (digestion, circulation, and respiration).

Factors that Affect BMR
There are several factors which can affect BMR including age, sex, weight, height, and muscle to fat ratio. Generally, men have higher BMR than women and as you get older your BMR decreases. Additionally, those with a higher muscle to fat ratio will typically have higher BMR than those with a lower ratio. Finally, a higher weight and height will usually lead to a higher BMR.

Overall, BMR is an important factor in calculating and understanding daily energy expenditure. Knowing your BMR can help you make better nutritional decisions to support your energy needs, as well as better understand how your body uses energy.