NUTRITN 130 Lecture Notes - Lecture 6: Indirect Calorimetry, Joule, Resting Metabolic Rate
Document Summary
Outtake: basal metabolic rate, thermic effect of food, physical activity. The energy content of foods and beverages a person consumes. Sun -> plants (food) -> calories -> body. Nutrients necessary for operation of human energy systems. B vitamins, as coenzymes, are involved in many energy processes. Minerals, as metalloenzymes, are also involved in energy processes; iron is part of hemoglobin to transport oxygen. The amount of energy a person uses daily to complete all bodily activities. Total number of kcals expended in a day. What determines tdee: thermic effect of feeding, thermic effect of physical activity, resting metabolic rate. 95% of energy expenditure is from reactions with oxygen. By measuring oxygen consumption, or heat you can measure energy expenditure. Indirect calorimetry - measures oxygen consumption as an estimate of metabolic rate. Doubly labeled water - have individuals drink this water, calculate consumption based on what is excreted. Oxygen consumption and energy expenditure are directly related.
