Emily (40 years old, 55 kg, resting HR: 55bpm) has an relative VO2max of 60 ml/kg/min.

What is Emily's absolute VO2max?

Question

Emily (40 years old, 55 kg, resting HR: 55bpm) has an relative VO2max of 60 ml/kg/min.

What is Emily's absolute VO2max?

BlackTom AI · Accepted Answer

Relative VO2max is expressed per kilogram of body mass (ml/kg/min), so convert to absolute by multiplying by the person’s mass and converting ml to liters.

1. Relevant knowledge points and concepts
- Relative VO2max (ml/kg/min) = oxygen uptake normalized to body mass.
- Absolute VO2 (ml/min or L/min) = total oxygen uptake independent of body mass.
- Conversion: absolute VO2 (ml/min) = relative VO2 (ml/kg/min) × body mass (kg). To get L/min, divide ml/min by 1000.
- Age and resting heart rate are irrelevant for this unit conversion; only body mass and the relative value matter.

2. Complete reasoning process step by step
- Start with relative VO2max = 60 ml/kg/min and mass = 55 kg.
- Multiply the relative value by mass to get ml per minute.
- Convert ml/min to L/min.

3. Calculations with intermediate steps
- Absolute VO2 (ml/min) = 60 ml/kg/min × 55 kg
- 60 × 55 = (60 × 50) + (60 × 5) = 3000 + 300 = 3300 ml/min
- Convert to liters: 3300 ml/min ÷ 1000 = 3.3 L/min

4. Why the correct answer is correct
- The arithmetic and unit conversion show that a relative VO2max of 60 ml/kg/min for a 55 kg person equals 3300 ml/min, which is 3.3 L/min. That matches the correct choice exactly and uses the standard method for converting relative to absolute VO2.

5. Why the other options are incorrect
- 2.8 L/min: corresponds to 2800 ml/min; dividing by 55 kg gives ≈50.9 ml/kg/min, not 60, so arithmetic mismatch.
- 3.3 ml/min: incorrect by a factor of 1000 in units (should be 3300 ml/min or 3.3 L/min).
- 2.8 kg O2/min: nonsensical units (oxygen uptake is expressed in ml or L of O2 per time, not kg O2/min here) and numerically incorrect.

6. Conclusion
- The correct absolute VO2max is 3.3 L/min, which matches the provided answer.

Emily (40 years old, 55 kg, resting HR: 55bpm) has an relative VO2max of 60 ml/kg/min. What is Emily's absolute VO2max?单项选择题

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