The latest technology and ever-increasing scientific insights into the structure of the human body and its functions make it possible for us today to define our body weight, body water and fat content fairly accurately. And not only in the field of medicine, but also in the normal family household.
The keyword is: Bio-impedance analysis (BIA)
It is a measurement method recognized by scientists worldwide that passes weak, invisible to humans, current through the body. In doing so, one makes use of the knowledge that electricity flows more easily through the muscles than through body fat. The measured resistance to flow (Bioelectrical Impedance) provides information about the body water content, which can be converted into the body fat percentage according to the so-called Brozek formula and reference values obtained in clinical studies.
New findings from the fields of medicine, science and research have shown that the previous classic measurement system of the BMI (body mass index = body mass index), does not always make reliable statements about the fat content and in 25% of all calculations even wrong. In the medical field, the BIA (Bioelectrical Impedance Analysis) method has long been used to measure body composition, providing very accurate control results and being scientifically recognized.
Recommended guidelines for body fat percentage
|Age in years||healthy||elevated||obese|
|20 - 39||21 - 32%||33 - 38%||39% +|
|40 - 59||23 - 33%||34 - 39%||40% +|
|60 - 70||24 - 35%||36 - 41%||42% +|
Recommended guideline values for the proportion of body water
- Women 50 - 55%, men approx. 60 - 65%
- Athletes should have values about 5% higher than normal to avoid dehydration during exercise (up to 1.5 liters of body water per hour).
Important notes for measuring according to the BIA method
- For reproducible results should always be measured at the same time as possible.
- Ideal is the period in the evening between 18.00 - 20.00 clock.
- Always measure naked. For the current to flow, you have to stand barefoot on the electrodes.
- In order to obtain correct measuring results one should drink approx. 30 minutes before no larger quantities or eat.
- Scales should be approved according to the Medical Products Act (MPG) in order to be properly calibrated and to ensure a reliable measurement.
Attention: For carriers of cardiac pacemakers, the BIA weighing system is not suitable.