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The level of energy needed to keep involuntary body processes going. These processes include heartbeat, breathing, generating body heat, perspiring to keep cool, and transmitting messages to the brain . For a sedentary person, BMR accounts for about 60-70 percent of daily energy expenditure; the remaining 30-40 percent is from physical activity and from body heat produced after a meal. Physical activity is responsible for as much as 50-60 percent of the total energy expenditure in people who include frequent aerobic activity into their lifestyles.