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Exercise Physiology: Theory and Application to Fitness and Performance 9th Edition by Scott Powers, Edward Howley
Edition 9ISBN: 0073523534Exercise Physiology: Theory and Application to Fitness and Performance 9th Edition by Scott Powers, Edward Howley
Edition 9ISBN: 0073523534What is the principle of underwater weighing? Why should a different body density equation be used for children, in contrast to adults?
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Underwater weighing of body mass is used to estimate body composition in two component system. Density of a body equals its mass divided by volume. Body mass (weight) is measured directly, and body volume is to be determined to calculate density. The body volume is determined used Archimedes principle. According to this principle, when an object is placed in water, it displaces water to be buoyed up, by a counterforce. The volume of displaced water is equal to the volume of the body.
However, some scientists obtain body volume by subtracting the weight measured in water (MW) from that measure in air (MA). The more accurate formula to convert the weight of water displaced to a volume is as follows:
Where D = density
M = mass of the body
V = volume of the body
MA = weight measured in air
MW = weight measured under water
DW = density of the water
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Step 3 of 3
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