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| thermadrene, military body fat, pinnacle, low carb bars, tanitabody fat scales, fitness magazine, futrex, losing weight, self calibrating, cardio sport, not elsewhere classified, product review, educational, thermacare, stenandiol, towel, revolutionary, product reviews, natural, | 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 fitnessfactory outlet in the literature as fitnessfactory outlet 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. The technique of underwater weighing "computes body volume as the difference between body weight measured in air and weight measured during water submersion. In other words, body volume fitnessfactory outlet is equal to the 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. |
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| 2. Determination of the Percentage of Body Fat from Underwater Weighing 4 The percentage of body fat for an individual can be estimated from body density. As an approximation, assume that the body consists of two components -- lean tissue and fat product review tissue. Letting D = body density, W = body weight, A = proportion of lean tissue, B = proportion of fat tissue (so A + B = 1), a = density of lean tissue, and b = product review density of fat tissue, we have D = weight/volume = W/[lean tissue volume + fat tissue product review volume] = W/[A*W/a + B*W/b] = 1/[(A/a) + (B/b)]. Solving for B we find B = (1/D) * [ab/(a - b)] - [b/(a - b)]. 5 Using the estimates a = 1.10 gm/cm^3 and b = 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 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. |
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