How does a weighing tank work?
The weighing tank or the hydrostatic weighing tank operates by means of the Archimedes principle to determine the density of the human body and then calculate the percentage of fat in the body. After being normally considered outside the hydrostatic weight tank, the subject sits in a specialized seat and is lowered into the tank filled with water until it is completely submerged. Then the weight of underwater is recorded. It is important that the person exhale as much air as possible than it was submerged, so that the air in the lungs does not create another buoyancy. The process is usually repeated several times to obtain an exact measure of the underwater weight of the subject, which is one of the information used to calculate its percentage of body fat.
The calculation of the percentage of fat in the body has a lot in common with the density of each body in relation to the water density. The fat is less dense and has a larger bulk skeleton and muscles. It is also less thick than water. Therefore, the fat placed in the water tank should float because the fat is less thick than water.
skeleton and muscles are denser, with less volume than water and fat. The muscles and the skeleton placed in the water tank should sink because it is denser than water. In other words, when the body is immersed in a weighing tank, it sinks more or floats more based on the amount of lean tissue or fat. This is based on the principle of Archimedes, which says that when the object is placed in water, the weight of the relocated water will be proportional to the weight of the building.
together with the weight of the subject in and out of the water is required several other numbers to calculate the density of the human body and its percentage of body fat. This includes residual lung volume, water density and TV estimate by gastrointestinal tract captured by the amount of air. After calculating the body density - the absolute maximum is 1.10, which means there is no fat and the minimum is 0.90, which means that the body is all fats - an equation called siri equation is used to determine the percentage of the person's body fat. This equation says that for calculatingET percent of body fat should be divided by 495 body density, then deduct 450. For example, the body density of 1.07 would bring a percentage of body fat 12.6 percent, because 495 divided by 1.07 is 462.6 and 450 less than 12.6.
Use of weighing the tank for calculating the percentage of body fat is a process that requires large space. Therefore, it is mainly available in research institutions or universities and universities. The cost of its use can range from $ 10 to dollars to $ 75, depending on where it is done. Assuming this is done correctly and the calculations are accurate, this is the most effective method of measuring the body composition.