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basal metabolic rate
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Basal Metabolic Rate
Minimum amount of energy needed by the body to maintain life. It is measured when the subject is awake but resting, and includes the energy required to keep the heart beating, sustain breathing, repair tissues, and keep the brain and nerves functioning. The rate varies depending on the height, weight, age, and activity of the person. Measuring the subject's consumption of oxygen gives an accurate value for BMR, because oxygen is needed to release energy from food.
A cruder measure of BMR estimates the amount of heat given off, some heat being released when food is used up. BMR varies from one species to another, and from males to females. In humans, it is highest in children and declines with age. Disease, including mental illness, can make it rise or fall. Hormones from the thyroid gland control the BMR.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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