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Best Fat Paysites
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| rope, oxygen, antioxidants, sustainablefisheries, repeatability, fatskin, ediet, inversion, shoppingforvitamins, cytodyne, senior centers, | The technique of underwater weighing "computes body volume weight watchers as the difference between body weight measured in air and weight measured during water submersion. In other words, body weight watchers volume is equal to the weight watchers loss of weight in water with the appropriate temperature correction for the water's density" (Katch and McArdle 1977, p. 113). Using this technique, Body density = W/[(W - WW)/c.f. - LV], where W = weight in air (kg) WW = weight in water (kg) c.f. = water correction factor (equal to 1 at 39.2 degrees F because one gram of water occupies exactly one cm^3 at this temperature, equal to .997 at 76-78 degrees F) LV = residual lung volume (liters) (Katch and McArdle 1977, p. 115). The dataset provided here contains the weights of the subjects, but not the values of the three other quantities. |
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| Solving for B we find B = (1/D) * [ab/(a - antioxidants b)] - [b/(a - b)]. 5 Using the estimates a = 1.10 gm/cm^3 and b antioxidants = 0.90 gm/cm^3 (see Katch and McArdle 1977, p. 111, or Wilmore 1976, p. 123), we come up with "Siri's equation" (Siri 1956): Percentage of body antioxidants fat (i.e., 100 * B) = 495/D - 450, where D is in units of gm/cm^3. The dataset provided also gives a second estimate of body fat due to Brozek, Grande, Anderson, and Keys (1963, p. 137): Percentage of body fat = 457/D - 414.2, which is considered accurate for "individuals in whom the body weight has been free from large, recent fluctuations." There does not seem to be uniform agreement in the literature as to which of these two methods is best. 6 Volume, and hence the body density D, can be accurately measured in a variety of ways. |
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