BMR:. Basal metabolic rate (basal metabolism rate) basal metabolism (basal metabolism, BM) is the body in a state of extreme awake but quiet, free from muscle activity, ambient temperature, food and energy metabolism during mental stress and other effects rate.
Basal metabolic rate is calculated:
(1)基础代谢率%=(脉率+脉压)-111(Gale)
(2)基础代谢率%=0.75×(脉率+脉压差×0.74)-72(Read)
(3)基础代谢率%=1.28×(脉率+脉压差)-116(Kosa)Basal metabolic rate as gender, age, etc. and have a different physiological changes. Basal metabolic rate of men than women on average, higher than the young adult; the greater the age, the lower the metabolic rate. In general, the actual value of the normal difference between the average value of the basal metabolic rate of 10% -15% of all normal. More than 20% of normal, can be considered pathological state. When hypothyroidism, basal metabolic rate is 20-40% lower than the normal standard; Hyperthyroidism, basal metabolic rate 25 to 80% higher than the normal standard. Others such as adrenal and pituitary function, have reduced basal metabolic rate. Human at room temperature 18 ~ 25 ℃, fasting, awake supine and quiet state is referred to as base. Basal metabolism, the inevitably include mechanical work of the heart, the respiratory muscles, the digestive tract and vascular smooth muscle, as well as functional consumption due to liver, kidney and other secretory activity caused by basic life processes caused by various cells consumption, accounting for about 3/4 of the same kind of warm-blooded animals under the same environment, the basal metabolic rate is directly proportional to its surface area. Human body surface area S (cm2), by the weight W (kg) and height H (cm), calculated using various formulas.
In order to denote different levels of energy metabolism, body heat can be used for distributing per square meter of body surface area per hour [kJ / (h · m2) ], i.e., basal metabolic rate (BMR) is represented.
Body surface area (S), can be obtained from the following equation:
S（m2）=0.0061×身高（cm）+0.0128×体重（kg）-0.1529 Used clinically basal metabolism, determination of oxygen consumption per unit time (O2L / h). Because the basic state, conditions are relatively fixed, through investigation, using an oxygen heat price 19.3kJ to the following equation, basal metabolic rate (BMR) can be obtained.
BMR=O2L/h×19.3kJ÷S After obtaining the BMR, and then in accordance with the following table, according to his age, to determine whether the normal range (typically ± 10%).
Human basal metabolic rate per hour [kJ / (h · m2) ]
| age | 11~15 | 16~17 | 18~19 | 20~30 | 31~40 | 41~50 | > 51 | ||
| male | 195.5 | 193.4 | 166.2 | 157.8 | 158.7 | 154.1 | 149.1 | ||
| Female | 172.5 | 181.7 | 154.1 | 146.5 | 146.4 | 142.4 | 138.6 |
note:
Finally, very close to normal in basal metabolic rate of the same sex, weight and age group, of which about 90% of its metabolic rate and the average difference of no more than 15%. It is clinically this percentile as limit of normal. Beyond this limit it is considered basal metabolic abnormalities. The patients with hyperthyroidism, basal metabolic rate than its normal value by 20 to 80%; and hypothyroidism who are 20 to 40% lower than normal. Determination of basal metabolic rate is a simple and effective method for the diagnosis of thyroid disease in clinical practice.
Clinical significance:
Increased: hyperthyroidism, fever, cardiopulmonary dysfunction, pheochromocytoma, adrenal hyperthyroidism, leukemia, malignant tumors.
Reduction: hypothyroidism, cachexia, anorexia nervosa, hypopituitarism adrenal cortex.
Normal: -10 to + 15%
Men and women according to height, weight, calculate metabolic heat:
1, basal metabolic rate = (pulse rate pulse pressure +) -111 basal metabolic rate measurement, there are two methods, i.e., a front pulse pressure and pulse rate calculation, measurement, or analyzer measuring basal metabolism. The former is simple, which is more reliable. A general formula is: = basal metabolic rate (pulse pressure and pulse rate ten) -111. Normal value of ± 10%; + 20% ~ + 30% mild hyperthyroidism, + 30% to + 60% moderate> severe + 60%.
2, basal metabolic rate: fasting, sober, basic metabolic rate of the body to maintain life when lying still, room temperature 20 degrees Celsius.
女性: 61+ (9.6 x 体重kg) + (1.72 x 身高cm) -(4.7 x 年龄) = 基础代谢率
男性: 67 + (13.73 x 体重kg) + (5 x 身高cm) -(6.9 x 年龄)= 基础代谢率3, weight, age calculation method
男性基础代谢率（kcal/day）=66＋（13.7×体重）＋（5×体重）－（6.8×年龄）
女性基础代谢率（kcal/day）=655＋（9.6×体重）＋（1.8×体重）－（4.7×年龄）