Resting metabolic rate

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Resting Metabolic Rate

Resting Metabolic Rate (RMR), also known as Resting Energy Expenditure (REE), is the amount of energy expended by a person at rest. Pronounced as /ˈrɛstɪŋ mɪˈtæbəlɪk reɪt/, the term is derived from the Latin restare meaning "to remain" and the Greek metabole meaning "change".

Definition

Resting Metabolic Rate refers to the number of calories a person's body needs to perform basic physiological functions such as breathing, circulating blood, and cell production while at rest. It is measured in kilocalories per hour per kilogram of body weight.

Calculation

There are several methods to calculate RMR, including the Harris-Benedict Equation, the Mifflin-St Jeor Equation, and the Katch-McArdle Formula. These equations take into account factors such as age, sex, weight, and height.

Factors Affecting RMR

Several factors can affect a person's RMR, including age, sex, weight, muscle mass, and genetic factors. For example, muscle tissue has a higher metabolic rate than fat tissue, so individuals with more muscle mass will have a higher RMR.

Related Terms

  • Basal Metabolic Rate (BMR): The amount of energy expended while at complete rest, such as during sleep. BMR is often used interchangeably with RMR, but they are not exactly the same.
  • Total Daily Energy Expenditure (TDEE): The total amount of energy expended in a day, including RMR, physical activity, and the thermic effect of food.

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