Energy3 - Energy Definitions energy: capacity to do work...

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Energy Definitions • energy: capacity to do work – work = force * distance • kilocalories – heat needed to raise 1000 g water 1 degree Celsius, abbreviate kcal or Cal • gram calorie is heat needed for 1 g (this is tiny!) • kilojoules – This is the SI unit for energy, 4.184 kJ equal to 1 kcal Components of Energy Needs cold, heat, fear, stress, meds non-exercise adaptive thermogenesis NEAT large variation, intentional and unintentional PA use TEM because easier to measure (standard uses 5- 10%) size, composition, calories, phytochemicals TEF Basal vs resting age, sex, size, LBM, hormones BMR (RMR)
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Direct Calorimetry • measures heat given off by body – whole body calorimeter Indirect measures • rely on the relationship between oxygen and energy utilization – Energy equivalent of 1 L O 2 if burning pure CHO: C 6 H 12 O 6 + 6 O 2 --> 6CO 2 + 6 H 2 0 + 686 kcal –1 mo l O 2 occupies 22.4 L so this is 5.1 kcal per liter of O 2 – Fats produce 4.686 kcal/liter O 2 Indirect Calorimetry • Individual is not in starvation
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Energy3 - Energy Definitions energy: capacity to do work...

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