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Application Of Human Body Composition Analyzer

Traditionally, the use of body mass index (BMI) to determine the size and nutritional status of its limitations. The biofilm resistance (BIA) body composition analyzer can be used to obtain fat rate, fat body mass index and other data. The appropriate fat rate is 12% to 22% of men, 20% to 30% of women, medium fat body mass index is male 17.0 ~ 21.0, female 14.5 ~ 18.0. Human body composition analysis can be better for BMI than for body type judgment, nutritional assessment, prognosis of certain diseases and adjustment of dosage.

Weight and body mass index (BMI) are commonly used to reflect the nutritional status of the human body indicators, but it can not reflect the human body, fat and other components of the proportion of the practical application of its limitations. In recent years, the use of bioelectrical impedance test (BIA) for human body composition analysis, can more accurately judge the patient's body and nutritional status.

Body mass index and its defects

BMI is a commonly used parameter to evaluate human health. BMI = body weight (kg) / height ² (m²). The index takes into account the body's weight and height. According to past long-term use of standards, both normal and hospitalized patients can be assessed by BMI rough assessment of body size and nutritional status, see Table 1. In addition, the new Asia-Pacific obesity standard that BMI in 18.5 ~ 23 for the normal, 23 to 25 for the overweight,> 25 for obesity. Some scholars believe that the new standard is more suitable for the Asia-Pacific crowd.

BMI has long been used to guide clinical practice, such as according to NRS2002 score criteria, BMI <18.5 hospitalized patients are considered to have nutritional risks, need to nutritional support. In 2014, the newly released US obesity guidelines still recommend patients with BMI> 40 or obesity-related complications and BMI> 35, which may be considered for the treatment of weight loss such as gastric banding. However, it is sometimes not accurate to use BMI to evaluate the size. BMI's drawback is that it can not distinguish between weight from fat or muscle and other ingredients, and this distinction is of great significance to clinical evaluation.

2 body composition analyzer

The body composition analyzer is to measure the content of different components such as muscle and fat. In the past, the thickness of the wrinkles and the circumference of the arm were measured, and the methods such as double energy X-ray absorption (DEXA), MRI / CT scanning and BIA were widely used. DEXA in which the use of X-ray measured on the basis of bone density developed, can be directly measured thin tissue, bone tissue and adipose tissue content. However, this method has a high cost, and the problem of exposure to radiation limits its application. MRI / CT scan is the use of imaging technology to obtain human tomography, can clearly show muscle, fat and other different components, and then use the software to calculate the muscle, fat ratio. This method still exists high cost, long time-consuming defects, CT scan also exists ray exposure problems. The two methods are generally used only for scientific research.

Human body composition analyzer is the use of BIA method for measurement, is currently the most commonly used method. The method uses the different water content of different components of the body, the conductivity is also different characteristics, through the determination of electrical impedance, combined with height, weight, sex, age and other data, the estimated body muscle, fat and other different components of the proportion. BIA method of human body composition analysis began in the 20th century, 90 years, through years of development, BIA method to determine the reliability of human body components have been recognized. The early body composition analyzer used a single frequency (50 kHz) to measure the electrical impedance between the legs to calculate the body composition. The new BIA body composition analyzer not only through a number of electrodes (usually four, that is, both hands and feet), multiple frequencies (1,5,50,250,500 and 1000kHz, etc.) for segmentation, but also At the same time determination of resistance and reactance, so that the results of human body analysis more accurate and reliable. It can not only get the limbs and torso parts of the muscle, fat ratio, but also to distinguish between cells, extracellular water. Detailed body composition analysis provides the basis for assessing the nutritional status and disease status of the patient.


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