Body composition analyzer is to measure the content of different components such as human muscle and fat
Body composition analyzer The body composition analyzer measures the content of different components such as human muscle and fat. In the past, methods such as skin wrinkle thickness and arm circumference measurement, and underwater weighing were used. Currently, dual-energy X-ray absorptiometry (DEXA), MRI/CT scans, and BIA methods have been widely used. Among them, DEXA is developed on the basis of X-ray measurement of bone density, which can directly measure the content of lean tissue, bone tissue and adipose tissue. However, this method has high cost, radiation exposure and other problems that limit its application. MRI/CT scanning method uses imaging technology to obtain tomographic images of the human body, which can clearly display different components such as muscle and fat, and then use software to calculate the ratio of muscle and fat. This method still has the disadvantages of high cost and time-consuming, and CT scans also have radiation exposure problems.
The aforementioned two methods are generally only used in scientific research. The Sinai Body Composition Analyzer uses the BIA method for measurement, and it is currently the most commonly used method. This method takes advantage of the difference in water content and conductivity of different components of the human body. Through the measurement of electrical impedance, combined with data such as height, weight, gender, and age, the ratio of different components such as human muscle and fat is estimated. The body composition analysis of the BIA method began in the 1990s. After years of development, the reliability of the BIA method to determine the body composition has been recognized.
Early body composition analyzers used a single frequency (50kHz) current to measure the electrical impedance between the legs to calculate the body composition. The new BIA body composition analyzer not only uses multiple electrodes (usually 4, namely hands and feet), multiple frequencies (1, 5, 50, 250, 500, and 1000kHz, etc.) for segmented measurement, but also Measuring resistance and reactance at the same time makes the results of body composition analysis more accurate and reliable. It can not only obtain the muscle and fat ratio of the limbs and trunk, but also distinguish the intracellular and extracellular water. The detailed body composition analysis results provide a basis for the evaluation of the nutritional status and disease state of patients.