Bioelectric Impedance
Considered a field method, this technique is based on the concept that the lean tissue of the body is more conductive than fat tissue due to its higher water content. Testing involves placement of electrodes on the skin, while a low dose electrical current is passed through the body. The resistance to this current is determined and converted to percent body fat.
Average Test Time: Under 5 minutes
Advantages:
- Quick.
- Easy and comfortable.
Disadvantages:
- Not as accurate as the BOD POD, hydrostatic weighing, or DXA (error factor of ±8% fat).
- Results are greatly affected by the type of instrument used, hydration level, food intake, and skin temperature.
- Can’t be used by those with medical implants such as pacemakers and defibrillators.