When current passes through human body, it will be influenced by bone tissue and muscle tissue, while adipose tissue has less resistance to current. Therefore, by measuring human electrical impedance, bone mass and skeletal muscle rate can be inferred.
About basal metabolic rate, body fat scale mainly uses bioelectrical impedance method to measure. Bioelectrical impedance method is a noninvasive, nondestructive, rapid and accurate measurement method. By measuring the electrical impedance of human body, combined with the user's height, weight, age, gender and other data, we can calculate the body fat, muscle, water and other human health parameters, and then calculate the basal metabolic rate.
The above information is for reference only. If more detailed information is needed, it is recommended to consult relevant experts.