PHGY 209 Lecture Notes - Lecture 2: Body Fat Percentage, Lean Body Mass, Water Content
14 Sep 2016
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Document Summary
If you have more muscle than fat, you would have more water than someone who has a lot of fat. Amount of adipose tissue (fat) is main factor in determining body water percentage: if body water content is computed as lean body mass (i. e. excluding the fat), the differences b/w individuals become insignificant, water content decreases with age. Also, females have less water content (from puberty on; due to female sex hormones resulting in higher body fat percentage). At infant stage, both male and female have same water content. Physiological reference individual: 21 years old, white male, 70kg: for any given individual, must make adjustments for age, gender, weight, ethnic origin. Body water remains constant in health dynamic steady state . Obligatory vs. facultative losses: obligatory losses: ~1. 5l water / day (1. 0l insensible, 0. 5l urine/stool, facultative losses: vary with intake (loss thru urine.
