Breath equivalent

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The breathing equivalent or ventilation equivalent (EQO ₂ ) indicates the amount of inhaled air that is necessary to absorb one liter of oxygen into the blood.

The breathing equivalent at rest is approx. 25. An increase at rest indicates an enlargement of the dead space or hyperventilation . A decrease indicates a disruption of the respiratory center , for example due to opiates .

Breathing depth and breathing rate increase during exercise . If the load is gradually increased, as in spiroergometry , the breathing equivalent initially drops to around 20, and breathing becomes more economical. With higher exertion the breathing equivalent rises again, whereby limit values ​​of 30-35 are reached, breathing becomes less economical. The point at which the breath equivalent reaches its lowest value is called the respiratory threshold. In the literature, this is equated with the anaerobic threshold .

See also

• breathing
• Spiroergometry

Individual evidence

1. ^ H.-WM Breuer: Spiroergometry - Suggestions for Standardization and Interpretation , Pneumologie 2004

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