Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Basal metabolic rate (BMR) is the amount of energy expended while at rest in a neutrally temperate environment. It represents the minimum energy required to keep the body functioning, including maintaining vital organs.
5 Must Know Facts For Your Next Test
BMR accounts for about 60-75% of daily energy expenditure in most individuals.
Factors influencing BMR include age, sex, genetics, and body composition.
Muscle tissue has a higher metabolic rate compared to fat tissue, thus greater muscle mass increases BMR.
Hormones such as thyroxine and epinephrine can significantly affect BMR.
Measuring BMR typically requires strict conditions including fasting and resting state.
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Related terms
Resting Metabolic Rate (RMR): The amount of energy expended while at rest, which includes basic bodily functions plus digestion and minor physical activities.
Total Daily Energy Expenditure (TDEE): The total amount of calories burned by an individual in one day, including all activities.
Thermogenesis: The process of heat production in organisms, which can influence overall energy expenditure.