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Essential fat is the level at which physical and physiological health would be negatively affected, and below which death is certain. Athletic performance might be affected by body fat: A study by the University of Arizona indicated that the ideal body fat percentage for athletic performance is 12–18% for women and 6–15% for men. [6]
The level of physical activity can also be estimated based on a list of the physical activities a person performs from day to day. Each activity is connected to a number, the physical activity ratio. The physical activity level is then the time-weighted average of the physical activity ratios.
A wide variety of body composition measurement methods exist. The gold standard measurement technique for the 4-compartment model consists of a weight measurement, body density measurement using hydrostatic weighing or air displacement plethysmography, total body water calculation using isotope dilution analysis, and mineral content measurement by dual-energy X-ray absorptiometry (DEXA). [1]
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Ranges of healthy body roundness have been established to accurately classify people with healthy fat mass compared to obese people who are at risk for morbidities. [ 1 ] Compared to traditional metrics, such as the body mass index (BMI), (which uses weight and height), BRI may improve predictions of the amount of body fat and the volume of ...
Waist-to-height ratio: the average ratio for US college competitive swimmers is 0.424 (women) and 0.428 (men); the ratios for a (US) normally healthy man or woman is 0.46–0.53 and 0.45–0.49 respectively; the ratio ranges beyond 0.63 for morbidly obese individuals. [15]
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