- Resting metabolic rate
- Energy expenditure at physical rest, measured via breath gas analysis with a mask.
- RQ
- Respiratory quotient at rest: ratio of CO₂ output to oxygen uptake.
- Energy expenditure
- Energy expenditure calculated from oxygen uptake and CO₂ output.
- Substrate utilization
- Share of carbohydrates and fats in energy expenditure, calculated from the respiratory quotient.
- V̇O₂max
- Maximum oxygen uptake: uptake reaches a plateau even as the load continues to rise.
- VT1
- First ventilatory threshold: from this point, CO₂ output rises disproportionately to oxygen uptake.
- VT2
- Second ventilatory threshold: from this point, minute ventilation rises disproportionately to CO₂ output.