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Resting Metabolic Rate

Meaning

Resting Metabolic Rate (RMR) is the minimum number of calories required to maintain the body’s essential physiological functions—such as breathing, circulation, organ function, and basic cellular activity—while at rest in a thermally neutral environment. This rate represents the largest component of total daily energy expenditure and is a crucial indicator of an individual’s metabolic health and efficiency. RMR is heavily influenced by body composition, particularly lean muscle mass, and is regulated by key endocrine signals, predominantly thyroid hormones and sympathetic nervous system activity. Precise measurement of RMR is vital for personalized nutritional and weight management protocols.