A 110-pound female pedals a Monark cycle ergometer at 50 rpm against a resistance of 2.5 kiloponds. Calculate her absolute Y02.

Question

Quizplus · Accepted Answer

1. First, we need to convert the resistance from kiloponds to Newtons:
2. 2.5 kiloponds = 24.525 Newtons
3. The formula to calculate absolute YO2 is:
4. Absolute YO2 = (work rate/efficiency) / body weight
5. Work rate can be calculated as:
6. Work rate = force x distance x cadence
7. Distance is not provided, but we can assume it to be 1 meter for simplicity.
8. Force = resistance = 24.525 N
9. Cadence = 50 rpm
10. Putting all the values in the formula:
11. Work rate = 24.525 N x 1 m x 50 rpm x (2π/60) = 25.85 J/s or 25.85 watts
12. Efficiency is assumed to be 20% for cycling.
13. Body weight = 110 lbs = 49.9 kg
14. Putting all the values in the formula for absolute YO2:
15. Absolute YO2 = (25.85/0.2) / 49.9 = 1.737 L/min
16. Rounding off to one decimal place gives us the answer of 1.7 L/min, which is option D.

A 110-Pound Female Pedals a Monark Cycle Ergometer at 50