The repetition of the of the measurements paired with the reliance on a tried and true principle of density and weight certainly gives it an edge in accuracy. These are the major pros and cons of this method of weighing as outlined by Healthfully and Buzzle: Hydrostatic body fat testing is reported as being more accurate and reliable than most other weighing methods, but it is not all good. Due to the variety of moving parts, there is always room for error. There are a number of components that go into an accurate reading of one's weight and body composition. This weighing method is considered to be very accurate, but it does come with advantages and disadvantages that can disrupt percentage results and more. Once the results are tallied, a certain calculation is used to find the lean weight and fat weight in order to reveal the individual's percentage of body fat. Overall, the entire procedure is done three times and the results are averaged. The individual is then asked to remove all the air from their lungs and to remain still while their underwater weight is measured. Before submersion, however, the individual will sit on a special scale and slowly be lowered into the water. The goal is for there to be enough room for full submersion. Once this is done, the individual will get into a large tank of water. This can be done at home in your personal bathroom or similar space, but it usually is done within the testing facility. To execute hydrostatic weighing, the individual is first weighed on dry land. Hydrostatic weighing is a straightforward process with two main components: dry land weighing, and underwater weighing. If you are not, you have more lean muscle. In short, this method is designed to give the individual a clear understanding of their body composition: if you are more buoyant, you are carrying more body fat. A person with more muscle will weigh more underwater and be less buoyant. With fat being less dense than water and muscle and bone being denser than water, a person who carries more body fat will be lighter underwater, and much more buoyant. On the other end of the spectrum, lean tissues such as muscle and bone are denser than water. This is because both the density of fat mass and fat-free mass are constant. Using this principle, the hydrostatic body fat testing method is believed to determine the percentage of body fat in an individual's body. The Archimedes Principle states that the buoyant force placed on a submerged object (in this case, you), is equal to the weight of the fluid displaced by the object. Using Archimedes Principle of Displacement, hydrostatic testing measures one's total body density. Hydrostatic weighing is a type of body composition determination, meaning it measures body fat and lean mass. Before we can determine whether or not hydrostatic weighing is accurate, we first have to define what it is.
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