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Biology · 术语表

什么是 Maximal oxygen consumption？

Definition 7.5 High School Biology · 第 7 章 — Exercise and the Body’s Energy Needs

The maximal oxygen consumption , written $\dot V\!\mathrm{O_2}$ max, is the highest rate at which a person’s body can take up and use oxygen, in litres per minute — or, to compare people of different sizes, in millilitres per minute per kilogram of body mass. It sets the highest power that can be sustained by respiration alone. Typical values: $35\,\mathrm{mL}/\mathrm{min}$ per kilogram in a sedentary adult, $50$ in a trained student, $80$ or more in a champion endurance athlete.

Measuring oxygen consumption during exercise: every breath passes through the mask to a gas analyser that records the oxygen taken up and the carbon dioxide given off, minute by minute, while the treadmill sets the power.

示例

Example 7.6 (Reading the curve)

In the figure, $100\,\mathrm{W}$ of pedalling costs $1.5\,\mathrm{L}/\mathrm{min}$ of oxygen: $1.5 \times 20 = 30\,\mathrm{kJ}$ per minute, i.e. $500\,\mathrm{W}$ of metabolic power — the $100\,\mathrm{W}$ of work plus $400\,\mathrm{W}$ of heat and resting needs, in line with Proposition 7.2. The ceiling of $3.3\,\mathrm{L}/\mathrm{min}$ for a $66\,\mathrm{kg}$ subject is $50\,\mathrm{mL}/\mathrm{min}$ per kilogram.

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