Energy+balance_S10_Student

Energy+balance_S10_Student - Energy balance & body...

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Energy balance & body composition Chapter 8
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Energy balance
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Total energy expenditure basal metabolism physical activity Food consumption (Adaptation)
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Basal metabolism ~2/3 of energy expenditure Energy needed to maintain life when body is at complete digestive, physical, and emotional rest
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Physical activity Most variable aspect of energy expenditure Energy needed for activity depends on: Muscle mass Body weight Activity
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Thermic effect of food ~10% of energy expenditure Energy expended during: GI tract muscle activity Manufacture and secretion of digestive juices absorption via active transport Varies by food composition, meal size & frequency
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Percentage of energy expended during digestion/absorption Carbohydrates: 5-10% Protein: 20-30% Fat: 0-5% Alcohol: 15-20%
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Estimating energy requirements DRI Committee developed equations based on: Gender Growth Age Physical activity Body composition & body size
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Adaptive thermogenesis Extra energy expended due to: Physical conditioning Extreme heat or cold Overfeeding Starvation trauma Other types of stress Highly variable
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Body composition Measured indirectly Better measure of “fitness” than weight 6’4” 250#
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Determinants of HEALTHY body weight Good health & longevity Body mass index: Index of weight in relation to height = (weight in kg) / (height in m) 2
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This note was uploaded on 01/26/2012 for the course NTDT 200 taught by Professor Aljadir during the Fall '08 term at University of Delaware.

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Energy+balance_S10_Student - Energy balance & body...

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