HSS 2342 Lecture Notes - Lecture 7: Calorimeter, Cholecystokinin, Body Composition

• School: University of Ottawa
• Department: Health Sciences
• Course: HSS 2342
• Professor: Atiq Rehman

Document Summary

Energy balance (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) energy balance: energy in compared with energy out. 1 lb of fat = 3500 kcal shift in balance causes weight changes; not just fat changes (cid:1) Food composition (cid:1) bomb calorimeter: instrument measuring the heat released (cid:1) when food are burned, providing an estimate of potential energy in foods (direct) Measuring the amount of oxygen consumed is a indirect method to measure the energy released. Body is less efficient than bomb calorimeter. Food intake hunger: painful sensation initiating food-seeking behaviour. Desire for food physiologically determined with endorphins, empty stomach, gastric contractions. What, when and how much to eat satiation (end meal): feeling of fullness during meal and stops (cid:1) eating. Hormone cholecystokinin becomes active to make full feeling satiety (several hours later): fullness after meal; time between (cid:1) finish eating and feeling hungry again (cid:1) Thermogenesis: generation of heat, used to measure how. Basal metabolism, physical activity, food consumption, adaptation (sickness, injury)