You are an exercise physiologist working with an elite cyclist. You ask your cli

Question

You are an exercise physiologist working with an elite cyclist. You ask your client to cycle on a Monark ergometer for 30 minutes.   This individual is 5'11''and 149 pounds. The resistance against the flywheel is 3.0 kg. The pedaling speed is 90 rev/min. While the subject is cycling, you collect the rates of oxygen consumption (VO2 = 3.68 L/min) and carbon dioxide production (VCO2 = 3.72). Assuming that at rest this subject's VO2was 0.305 L/min and his VCO2was 0.235 L/min, what is his net efficiency?

Explanation / Answer

C + O2 = CO2

12 32 44

1 1.375

0.305 0.419

3.68 5.06

total intake of oxygen in 30 min = 3.68 x 30 = 110.4 L

total output of CO2 = 3.72 x 30 = 111.6 L

assuming at normal conditions for every 0.305 L of O2 he produces 0.235 L of CO2

thus by this ratethe CO2 produced should be 85.06 L

actual produced CO2 = 111.6 L

during the excercise the efficiency pf the body is incresed thus the production of Co2 will be more

increase in production = 111.6 - 85.06 = 26.54 L of CO2

the ratio of increased production by normal production will be a measure of the net efficiency

thus efficiency = 26.54 / 85.06 x 100 = 31.2 %

thus he is 31.2 % more efficient than at rest

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