![]() It was revised in 1984 to be more accurate and was used up until 1990, when the Mifflin-St Jeor Equation was introduced. The Harris-Benedict Equation was one of the earliest equations introduced. In most situations, the BMR is estimated with equations summarized from statistical data. The daily caloric need is the BMR value multiplied by a factor with a value between 1.2 and 1.9, depending on activity level. Basal metabolism is usually the largest component of a person's total caloric needs. An accurate BMR measurement requires that a person's sympathetic nervous system is inactive, which means the person must be completely rested. The BMR is measured under very restrictive circumstances while awake. Physical activity makes up ~20% of expenditure and ~10% is used for the digestion of food, also known as thermogenesis. For most people, upwards of ~70% of total energy (calories) burned each day is due to upkeep. In such a state, energy will be used only to maintain vital organs, which include the heart, lungs, kidneys, nervous system, intestines, liver, lungs, sex organs, muscles, and skin. It is the equivalent of figuring out how much gas an idle car consumes while parked. The basal metabolic rate (BMR) is the amount of energy needed while resting in a temperate environment when the digestive system is inactive. Physical activities increase the metabolic rate.Dietary driven deficiencies (poor iodine levels) diminish the metabolic rate.When you are ill or sick, your RMR (resting metabolic rate) increases in order to be able to fight the infection.BMR is usually higher in men when compared to women.Muscle mass gains increase the metabolic rate.Genes and environmental temperature have a significant role in metabolic rate changes.Resting metabolic rate slows down as the age increases and weight decreases.The Basal Metabolic Rate (BMR) Calculator estimates your basal metabolic rate-the amount of energy expended while at rest in a neutrally temperate environment, and in a post-absorptive state (meaning that the digestive system is inactive, which requires about 12 hours of fasting).
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