Kinesiology 3339A/B Lecture Notes - Lecture 32: Triceps Brachii Muscle, Magnetic Resonance Imaging, Fluid Compartments
19 Oct 2016
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Body composition vs body mass assessment: chemical analysis. Only direct method to assess composition (4 major parts fat free mass, fat mass, bone mineral, water) Eg. , 5"10 , 154 lb male (70 or 1. 778 m; 70 kg) Limitation: anyone with substantial muscle mass will be in obese range. Genderless (same calculations for female and male) 30 = obese range: waist:hip ratio. Narrowest point for waist; widest for hips. Females > 0. 85; males > 0. 95 higher risk for chronic disease. Android (apple) vs gynoid (pear) and health implications. Better than height-weight but still limited: densitometry (2 component model [fat-free mass, fat mass]) Because tissue density differs (fat =0. 900 g/ml; fat-free mass = 1. 100 g/ml) overall body density affected by relative composition (below or above 1 because 60% of body is water) Mass (weight) measured on any accurate scale. Volume assessed by hydrostatic weighing (underwater weighing) - water displacement or air displacement (plethysmography)
