Metabolic rate refers to the amount of energy consumed by the body per unit of time, and can be divided into three types of energy metabolism: basal metabolic rate, resting metabolic rate and active metabolic rate, according to the type of energy metabolism. And in clinical practice metabolic rate usually refers to basal metabolic rate, which is the energy consumed by the activities of life-sustaining cells and tissues. The basal metabolic rate is measured by basal metabolic rate in the early morning, awake, lying still, without muscle activity, with good sleep the night before and at least 12 hours of fasting, with room temperature at 20-25°C. The basal metabolic rate is measured by a basal metabolic meter. Also clinically there is a formula, basal metabolic rate = (pulse rate + pulse pressure) – 111, adult basal metabolic rate is between -10% and 15%. Increased basal metabolic rate is commonly associated with hyperthyroidism, fever, hyperadrenocorticism, and pheochromocytoma; decreased basal metabolic rate is usually seen in hypothyroidism and hypoadrenocorticism.