Medically the review by Gerhard Whitworth, R.N. — created by Scott Frothingham — updated on October 19, 2018

definition of expiratory make reservation volume

Ask a medical expert for a an interpretation of expiratory reserve volume (ERV) and they’ll sell something along the currently of: “The extra volume of wait that can be expired native the lung with figured out effort adhering to a typical tidal volume expiration.”

Let’s make that much easier to understand.

You are watching: Explain the change in erv with exercise.

Picture yourself sitting normally and breathing together you do when you space not exerting yourself orexercising. The quantity of air you breathe in is her tidal volume.

After you breath out, shot to exhale much more until you space unable to breathe out any much more air. The lot of air girlfriend can force out after a normal breath (think around blowing up a balloon) is her expiratory to make reservation volume.

You have the right to tap into this to make reservation volume once you exercise and your tidal volume increases.

To sum up: her expiratory make reservation volume is the amount of extra wait — over anormal breath — exhaled throughout a forceful breath out.

The average ERV volume is around 1100 mL in males and 800 mL in females.


Respiratory volumes space the quantity of air inhaled, exhaled, and also stored in her lungs. Together with expiratory reserve volume, part terms that space often part of a ventilatory pulmonary duty test and can be valuable to understand include:

Inspiratory to make reservation volume. The quantity of extra waiting inhaled — over tidal volume — throughout a forceful breath in. As soon as you exercise, you have a make reservation volume to tap right into as your tidal volume increases. The median inspiratory make reservation volume is around 3000 mL in males and 2100 mL in females.Vital capacity. The total usable volume the the lungs that you deserve to control. This is not the entire lung volume together it is difficult to voluntarily breathe all of the air the end of her lungs. The average vital capacity volume is around 4600 mL in males and 3400 mL in females.Total lung capacity. The total volume of her lungs: your an important capacity to add the quantity of waiting you can not voluntarily exhale. The average total lung volume volume is around 5800 mL in males and 4300 mL in females.

If your doctor sees indicators of a chronic lung condition, castle will usage spirometry to determine exactly how well her lungs work.Spirometry is vital diagnostic tool for identifying:

Once diagnosed v achronic lung disorder, spirometry can be provided to screen progress and to recognize if your breathing difficulties are being effectively treated.


The quantity of lung volume varies from human to person based on their physical makeup and their environment.

You are likely to have a larger volume if you:

are talllive in ~ a higher altitudeare physically fit

You are likely to have a smaller sized volume if you:

are short

Your expiratory reserve volume is the lot of extra air — above-normal volume — exhaled throughout a forceful breath out.

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Measured through spirometry, her ERV is part of the data gathered in pulmonary duty tests offered to diagnose restrictive pulmonary diseases and also obstructive lung diseases.


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Medically the review by Gerhard Whitworth, R.N. — written by Scott Frothingham — updated on October 19, 2018