Different body fat meter manufacturers have different measurement results
“The data measured by the body fat meter and body fat scale are only a rough guide.” According to Yang Yong, an associate professor of the School of Electrical Engineering of Huazhong University of Science and Technology, some of the common body fat meters on the market hold two electrodes with both hands, and some use both feet. On both electrodes, the current forms a loop in the human body. However, the human body is a very complex object, and the conductivity of each part changes with the continuous change of water content and mineral content.
Jiang Chongmin, a researcher at the National Fitness Monitoring Center, told reporters that in scientific research, it is recommended to use the “DEXA method” to measure body fat percentage. This method is relatively accurate, but the cost is also very high, the price of a set of instruments is as high as one million yuan. Most of the common body fat scales and body fat meters on the market use the bioelectrical impedance method (BIA) to measure. The accuracy of the values of the instruments produced by different manufacturers due to the different number of electrodes, different samples and reference systems for establishing evaluation standards There are also certain differences. However, the body fat percentage measured by this method is not the same as the measurement result of the DEXA method.
Jiang Chongmin introduced that the methods for measuring body fat content include BMI (body mass index) formula method, sebum clamp measurement method, and underwater weighing method, but they also have their own limitations. For example, underwater weighing requires the tester to hold back in the water for a while and exhale the air in the lungs. This method is very cumbersome and can only be carried out in a laboratory, and the accuracy is also open to question. Although the sebum clamp measurement is simple, it needs to be measured at multiple locations, and data deviation is likely to occur during the test process.
Which method is simple and reliable for measuring body fat? Jiang Chongmin introduced that citizens can use the BMI formula to conduct self-tests. Through this formula, the BMI value is within the range of 18.5 to 24, which is normal, 24 to 28 is overweight, and higher than 28 is obese. “There is a premise here, that is, we believe that excess weight is excess fat. If people with more muscles use this method, there will be a’misdiagnosis’.”