The latest technology and ever advancing knowledge of science about the structure of the human body and its functions make it possible that today we can define our body weight, its body water and fat percentage quite accurately. And this is not only in the field of medicine, but also in the normal family household.
The keyword is called: bio-impedance analysis (BIA).
It is a measurement method recognized by scientists worldwide, in which weak, for humans imperceptible, current is passed through the body. It takes advantage of the finding that electricity flows more easily through muscle than through body fat. The measured flow resistance (bioelectrical impedance) provides information about the body water percentage, which can be converted into body fat percentage according to the so-called Brozek formula and reference values obtained in clinical studies.
Background info
New findings from the fields of medicine, science and research have shown that the previous classic measurement system of BMI (Body Mass Index= body mass index), does not always make reliable statements about the fat percentage and is even wrong in 25% of all calculations. In the medical field, the BIA method (Bioelectrical Impedance Analysis), which provides very accurate control results and is scientifically recognized, has long been used to measure body composition.
Recommended guideline values for body fat percentage.
| Age in years | Healthy | increases | 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 body water percentage
- Women 50 – 55%, men about 60 – 65%.
- Athletes should have about 5% higher than normal values to avoid harmful fluid loss during exercise (up to 1.5 liters of body water per hour).
Important notes for the measurement according to the BIA method.
- For reproducible results should always be measured at the same time, if possible.
- Ideal is the period in the evening between 18.00 – 20.00 clock.
- Always measure unclothed. So that the current can flow, you must stand barefoot on the electrodes.
- To achieve correct measurement results should not drink or eat large amounts about 30 minutes before.
- Scales should be approved under the Medical Products Act (MPG) to be properly calibrated and ensure reliable measurement.
Note: The BIA weighing system is not suitable for wearers of pacemakers.
