HUN 2000 Lecture Notes - Lecture 8: Leptin, Body Mass Index, Lean Body Mass
24 Aug 2016
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Energy in = bmr + tef + pa (+) positive energy balance. Energy in > bmr + tef + pa. Extra energy goes into the storage (fat) ( ) negative energy balance. Energy in < bmr + tef + pa. Excess energy is stored as: triglycerides / glycogen. Ways to estimate energy expenditure: standard formulas. Resting metabolic rate (rmr) for individuals with same sex / age / weight are fairly constant. Weight can be used in a standard equation. Physical activity (pa) can be estimated from adding up energy required for various activities. Tef is 10% of energy intake: bioelectrical impedance (bia) Uses a weak current to determine the percent of body fat and lean body mass (lbm) Fat is a poor conductor of electricity so it offers resistance to the current. Can use lbm to predict bmr: body mass index (bmi) Body fat stores can be estimated by evaluating weight for height.
