10. Resting Energy Expenditure

Question 1

Total Daily Energy Expenditure

Answer 1

TDEE in M vs W
• 19-50 yo…M= 2900kcal W= 2200kcal
• Variability exists btw individuals (**physical activity)

Question 2

Basal metabolic rate

m vs w?

Answer 2

Basal Metabolic Rate (BMR): min amount of energy to sustain vital fxns in the waking state

BMR in M vs W
• 5-10% lower in W (also lower metabolism) bc women generally possess more body fat & less FFM
• Everyone experiences a 2-3% per decade reduction in BMR…due to changes in body composition

Question 3

Resting metabolic rate

Answer 3

• Resting Metabolic Rate (RMR): 3-4 hrs after a light meal without prior physical activity
o RMR= 60-75% total daily energy expenditure (TDEE)
o Thermic effect of food= 10% TDEE
o Physical Activity= 15-30% TDEE

Question 4

Test Criteria for Achieving Max O2 Consumption

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Answer 4

VO2max should be reached between 8-12 minutes.
• Achieving VO2max:
1) A plateau in VO2 with increasing intensity
2) Reach age-predicted max HR
3) Reach an RER above 1.15 at max
4) Blood lactate level of at least 8 mmol
• Achieving VO2peak:
o When a plateau in O2 DOES NOT occur But pt reaches the other criteria. It is the highest value of O2 consumption measured during a graded exercise test.
• VO2max Treadmill Protocols: Bruce, Modified Bruce*, Blake, Nauhgton, Astrand, Ellestad, Harbor

Question 5

Factors Affecting VO2max

Answer 5

Factors Affecting VO2max
• Heredity: genetics accounts for about 50% of VO2max
• Gender: WOMEN achieve values 15-30% below MEN
o Due to body comp differences (less lean mass, more fat) & Hb (10-14% lower Hb)
• Body Size & Composition
o Body mass may explain nearly 70% of the differences in VO2max among individuals
• **Size of activated mm is the most important determinant