What Is Basal Metabolic Rate?

Basal metabolic rate (BMR) is the rate at which the body uses energy while at rest. It is measured in calories per hour or kilojoules per hour and is often expressed as a percentage of total energy expenditure.

BMR accounts for about 60-70% of total energy expenditure, with the remaining 30-40% used for physical activity and other activities such as digestion and absorption of food.

BMR is determined by several factors, including:

* Age: BMR generally decreases with age, as muscle mass decreases and the proportion of body fat increases.

* Gender: Men typically have higher BMRs than women, due to their greater muscle mass.

* Body composition: People with more muscle mass have higher BMRs than those with more body fat.

* Genetics: Some people are simply born with higher BMRs than others.

* Environmental factors: BMR can be affected by factors such as stress, sleep deprivation, and extreme temperatures.

BMR can be measured using a variety of methods, including:

* Indirect calorimetry: This method measures the amount of oxygen consumed and carbon dioxide produced by the body at rest.

* Body composition analysis: This method uses a machine to measure the body's composition, including muscle mass and body fat.

* Predictive equations: These equations use factors such as age, gender, weight, and height to estimate BMR.

BMR is an important factor in weight management. By knowing their BMR, people can better understand their energy needs and make adjustments to their diet and exercise routine to lose or maintain weight.

Body Composition: What It Is and How Much Weight Should at the Gym?