Energy balance 2

Question 1

What are the % contribution levels of the different parts of TEE?

Answer 1

Basal energy expenditure (BEE) (BMR or RMR) - 60-75%
Diet induced thermogenesis (DIT or TEF) 5-10%
Physical activity 20-40%
NEAT - unknown

Question 2

Why would you use current weight over desired weight to calculate current BEE?

Answer 2

BEE is the energy your body requires to carry out the necessary biochemical and physiological functions of the body at this current point in time. If you used desired body weight this would therefore underestimate current biochemical and physiological body requirements.

For weight loss however, you can estimate energy requirements based on his desired weight, or make an adjustment to his current BEE to allow for weight loss.

Question 3

Describe the differences in measuring BMR vs RMR?

Answer 3

BMR

• fasting metabolic rate - 12 hours post-prandial
• measured with subject/patient sleeping overnight at the experimental facility or measured at home upon waking
• measured in thermo-neutral environment (22-27 degrees)

RMR

• close approximation of BMR
• can overestimate BMR by up to 10%
• not always thermo-neutral environment
• measured after the subject/patient has awakened and/or expended some energy travelling to the experimental facility for measurement

Question 4

What macronutrients have the highest to lowest TEF?

Answer 4

Protein - DIT uses 25% of protein energy (inefficient)
Alcohol - uses 22% of ethanol energy (inefficient)
CHO - 8% glucose energy (fairly efficient)
Fat - 2% (very efficient)
= cost of digestion/storage/transport

Question 5

How do you calculate NEAT?

Answer 5

TEE - (BMR+TEF) = NEAT

Question 6

When does BMR increase/decrease?

Answer 6

increases - with body weight/muscle mass

decreases - with age (as lean muscle decreases), or weight loss