NUTR 4210 Lecture Notes - Lecture 1: Carnitine O-Palmitoyltransferase, Blood Plasma, Erythropoietin

• School: University of Guelph
• Department: Nutrition
• Course: NUTR 4210
• Professor: Lindsay Robinson

Document Summary

Positive energy balance: weight gain/obesity, pregnancy (state of growth) This takes a long time to change back through refeeding. Which factors are under your control: avoiding a low kcal diet. Measuring total energy expenditure: all metabolic processes generate heat, heat production can be used as a measure of energy expenditure. Direct calorimetry: measures the heat a person generates (i. e. heat production) in a sealed chamber, heat energy is measured as a change in water temperature, amount of heat is proportional to amount of energy expended. Cons: very expensive, confined space, such direct assess(cid:373)e(cid:374)t is(cid:374)"t (cid:448)er(cid:455) pra(cid:272)ti(cid:272)al or feasi(cid:271)le, used mostly for research purposes. Indirect calorimetry: a method of estimating energy expenditure by measuring changes in oxygen consumption and/or carbon dioxide production. Principle: as the (cid:271)od(cid:455)"s e(cid:374)erg(cid:455) e(cid:454)pe(cid:374)diture i(cid:374)(cid:272)reases, the use of o(cid:454)(cid:455)ge(cid:374) a(cid:374)d the production of carbon dioxide by the aerobic energy system increases proportionately.