Basal metabolic rate.
Basal metabolic rate is the amount of energy, required for the very basic and absolutely vital bodily functions, when the person is in a relaxing state in a comfortable  and warm environment and has not eaten for at least twelve hours.
This minimal amount of energy is necessary for the involuntary function of organs and systems, including brain, kidneys, skin and cardiovascular, respiratory, autonomic, immune and digestive systems.
Basal metabolic rate varies from person to person, depending on age, gender, body mass index, daily cardiovascular exercise and in general physical condition. For instance, basal metabolic rate is higher in males, young people and in men and women with well developed muscular system. Other factors that may have an impact on basal metabolic rate include stress, environmental temperatures and illnesses.
It is well acknowledged that regular aerobic exercise can cause a significant increase of basal metabolic rate. Studies have shown that caloric consumption remains high for at least the next hour, after the end of moderate training session. Some people present elevated basal metabolic rate by ten percent for approximately two days after they have a strenuous physical activity.
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