Is There a Right Way To Breathe? – Breathing.com

Lung measuring

*   Forced vital capacity (FVC). This measures the amount of air you can exhale with force after you inhale as deeply as possible.

* Forced expiratory volume (FEV). This measures the amount of air you can exhale with force in one breath. The amount of air you exhale may be measured at 1 second (FEV1), 2 seconds (FEV2), or 3 seconds (FEV3). FEV1 divided by FVC can also be determined.

* Forced expiratory flow 25% to 75%. This measures the air flow halfway through an exhale (FVC).

* Peak expiratory flow (PEF). This measures how quickly you can exhale. It is usually measured at the same time as your forced vital capacity (FVC).

* Maximum voluntary ventilation (MVV). This measures the greatest amount of air you can breathe in and out during one minute.

* Slow vital capacity (SVC). This measures the amount of air you can slowly exhale after you inhale as deeply as possible.

 * Total lung capacity (TLC). This measures the amount of air in your lungs after you inhale as deeply as possible.

 * Functional residual capacity (FRC). This measures the amount of air in your lungs at the end of a normal exhaled breath.

 * Expiratory reserve volume (ERV). This measures the difference between the amount of air in your lungs after a normal exhale (FRC) and the amount after you exhale with force (RV).

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