Timothy is a 40-year old recreational athlete, who weighs 70 kg and has a restin

Question

Timothy is a 40-year old recreational athlete, who weighs 70 kg and has a resting heart rate of 50 bpm.

a)Determine his metabolic rate if he is resting, his VO2 is 0.30 l/min, an d he is in the postabsorptive state after a mixed meal.

b)Under these same resting conditions, what are Timothy’s caloric expenditures per minute derived from carbohydrates and fats?

c)Now Timothy exercises at a submaximal workload with a VO2 of 3.0 l/min, and his RQ is measured to be 0.9. What is his metabolic rate? How many calories per minute are derived from carbohydrates and fats?

d)Timothy sustains this constant load exercise for 30 minutes. How many calories has he burned during this exercise bout?

Explanation / Answer

a) Metabolic rate = VO2*Cal equiv of RQ

=  0.30 l/min * 4.82kcal/litre

= 1.446

b) At Resting conditions, Cal equiv of RQ is 4.82,  so his RQ or respiratory quotient is 0.82, meaning 40% Carbs, 60% Fats

c) RQ is 0.9

Metabolic rate= VO2*Cal equiv of RQ

= 4.92 kcal/min*3 L/min

= 14.8 kcal/min

Nutrient breakdown: CHO 68%, F 32%

14.8 *0 .68 = 10.1 kcal/min from Carbs, 14.8 • 0.32 = 4.7 kcal/min from fats

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