Energy Intake And Expenditure Flashcards
What can internal energy liberated during breakdown of an organic molecule appear as
Heat
Can be used to perform work
What is energy expenditure the sum of
Basal metabolic rate
Thermic effect of food
Energy expended with physical activity
What is basal metabolic rate
The amount of energy expended while at complete rest
What is thermic effect of food
The energy required to digest and absorb food
What is oxygen consumption (vo2)
The volume of oxygen used by your body to convert energy from the food into work
All energy-releasing reactions in the body ultimately depend on oxygen use, therefore vo2 is an indirect yet highly accurate measurement of energy expenditure
What is metabolic equivalent of task (MET)
Multiples of resting metabolic rate
1 MET = energy expenditure for sitting quietly
= 3.5ml o2/kg body weight/min
What are the energy expenditure measures
Calories (kcal)
Kilojoule (kg, equals 1000J)
What is a calorie (kcal)
1 calorie expresses the quantity of heat needed to raise the temperature of 1L of water 1*c
What is a kilojoule
Standard unit to express food energy
In humans, 1J = the energy released in 1sec as heat by an average sized person at rest
How to convert kcal to kJ
Multiple kcal value by 4.184
What is the most energy dense nutrient
Fat
