One subject experience a decrease in body fat percentage in the bia test after drinking water. The purpose of this study was to determine the effect of exercise and thermal dehydration and subsequent glycogen supercompensation on dxa based measurement of body composition.
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Effect of hydration on body fat measurement. That means that your changing level of hydration can have a significant effect on the body fat reading that you get. A reading below 69 may indicate dehydration and result in a fat weight reading that is 3 5 too high. Because your fat in your body has a lot of water in it you have to first know how much fat you have in your body before you can then figure out what your healthy water content is. This is especially significant after completing a vigorous workout routine. For an adolescent it is expected to be slightly higher. Body fat percentages in the control study using bioelectrical impedance ranged from 162 to 427 on the normal setting and from 125 to 408 on the athletic setting table 1.
That is if you say have 33 fat in your body then you only need another 37 of water alone because you have water in the fat. Your body fat is pretty water dense so dense in fact that body fat is comprised of about 10 water. Twelve active adult 18 29 years males exercised at 70 vo2max on a cycle ergometer in a thermal environment 30 c to induce a 25 reduction in body mass. Hydration status can be useful when reviewing the results of a body composition test. For an adult body water is expected to be 69 74 of lean body weight. Request pdf the effect of hydration status on the measurement of lean tissue mass by dual energy x ray absorptiometry purposeathletes cycle between exercise and recovery.