The study found that: when a certain frequency electrical signal passes through the human body, the fat part has a higher "impedance" value than muscle and other tissues of the human body. When a safe electrical signal of a specific frequency is used to pass through the human body, the electrical signal will change to different degrees due to the difference of the human body's "impedance" value.
Principle: Muscle contains more water such as blood, which can conduct electricity, while fat is non-conductive. Because the conductor of the current in the body is muscle, the weight of the muscle can be known from the difficulty of passing the current. From this, it can be judged that among the weight ratio, people with less muscle have a higher proportion of fat.
The correct health concept: A healthy body lies in the balance of body fat. Excessive accumulation of fat is harmful to the body and causes various diseases. Human body fat is an important part of the human body. It has important functions and functions in the human body, such as providing energy, protecting internal organs, maintaining body temperature, assisting the absorption of water-soluble vitamins, and participating in human metabolic activities. However, too much fat will affect human health, leading to diabetes, cardiovascular and cerebrovascular diseases. In addition, obese patients often face various distresses, such as being afraid of heat, affecting their body shape, and being prone to fatigue. Therefore, doctors and experts recommend that the body shape be controlled within a certain range. With the improvement of people's living standards, health issues are getting more and more attention, which also promotes the development of science for body composition measurement.
There are many methods for measuring body composition, especially body fat, mainly including hydrodensitometry, skinfold anthropometry, and bioelectrical impedance analysis (BIA). In addition, there are the relatively rapid development of dual-energy X-ray absorption (DEXA), computer tomography (X-Ray computed Tomography, CT), and magnetic resonance imaging (Magnetic Resonance Imaging), which have developed rapidly in recent years. MRI), etc., but these methods require relatively expensive equipment and professional training, and patients are susceptible to radiation and are not suitable for home use. The BIA method is convenient to use, the measurement results are relatively accurate, and the price is relatively low, which is favored by consumers.
The theory of BIA (Bioelectrical Impedance Analysis) is based on the fact that BIA is a technology designed to estimate body composition according to the different conductive properties of different body tissues. After the body tissue is connected to a current with a frequency greater than 50kHz, the current can pass through the extracellular fluid. But part of the current will be affected by the cell membrane (resistance, R); part of the current is temporarily charged by the cell membrane and slow down the speed of the current. This is the resistance (reactance,). Impedrance (Z) is the sum of resistance and resistance, usually resistance occupies More than 90.
The electronic fat scale is based on the above principles, using the electrode pads on the surface of the scale body to contact the user's legs, passing a certain safe current, and measuring the human body resistance (bio-impedance). Then based on the input user data and the measured human body resistance , Using the formulas we have obtained in extensive experiments, we can more accurately measure body composition such as body fat percentage, body water percentage, body muscle percentage, and bone weight.
