Resting Metabolic Rate

Question 1

Resting Metabolic Rate

Answer 1

• RMR
• Sum of metabolic processes of the active cell mass required to sustain normal regulatory balance and body functions during resting state
• Energy requirements at rest

Question 2

Percentages for Total Daily Energy Expenditure (TDEE)

Answer 2

• 60-75% –> RMR
• 10% thermic effects of eating
• 15-30% physical activity

Question 3

Difference between RMR and BMR

Answer 3

• Often used interchangeably
• BMR must be conducted IMMEDIATELY after waking and in a controlled lab environment
• RMR is usually measured 3-4 hours after a light meal w/o prior physical activity

Question 4

Methods for measuring RMR

Answer 4

• Direct calorimetry
• Indirect calorimetry
• RMR formulas

Question 5

Direct Calorimetry

Answer 5

• Estimates energy production through measuring body heat production
• Measured through water flow in heat exchanger
• Difference in water temperature entering and leaving the chamber where the individual lays
• Very expensive
• Not practical for large scale settings

Question 6

Indirect Calorimetry

Answer 6

• Uses mouthpiece and tubing, oftentimes hood and canopy
• Feasible for clinical or lab testing
• More costly and accurate than RMR formulas

Question 7

RMR Formulas

Answer 7

• Less accurate

- Common in fitness settings

Question 8

Factors influencing RMR

Answer 8

• Genetics
• Gender (women have lower RMR due to decreased lean mass)
• Age (decreases 2% after 20 and 3% per decade)
• Weight/height
• % BF (leaner = higher RMR)
• Exercise
• Disturbed eating patterns

Question 9

Preparing for RMR Testing

Answer 9

• Fast overnight, or at least 4 hours following a small meal
• Don’t smoke morning of
• Drink lost of water night before
• Avoid exercise night before and on morning of test

Question 10

RMR Test

Answer 10

• Typically 30 minutes (20 minutes resting, 10 minutes usable data)
• Do as little as possible during test
• DON’T SLEEP
• Relax, breathe normally

Question 11

Oral Glucose Tolerance Test

Answer 11

• 2-3 hour test that checks blood glucose levels before and after a special sweet drink
• Tells how the body processes glucose
• Diabetes is diagnosed at 2 hour blood glucose of greater than or equal to 200 mg/dl

Question 12

Normal OGTT Result

Answer 12

Less than 140 mg/dl

Question 13

Prediabetes OGTT Result

Answer 13

140-199 mg/dl

Question 14

Diabetes OGTT Result

Answer 14

200 mg/dl or higher