Medically reregarded by Gerdifficult Whitworth, R.N. — Written by Scott Frothingham — Updated on October 19, 2018

Definition of expiratory reserve volume

Ask a clinical expert for a meaning of expiratory reserve volume (ERV) and they’ll sell somepoint along the lines of: “The additional volume of air that can be expired from the lungs through established effort complying with a normal tidal volume expiration.”

Let’s make that much easier to understand.

You are watching: Explain the change in erv with exercise

Picture yourself sitting commonly and also breapoint as you carry out once you are not exerting yourself orworking out. The amount of air you breathe in is your tidal volume.

After you breathe out, try to exhale more until you are unable to breathe out any even more air. The amount of air you deserve to pressure out after a normal breath (think about blowing up a balloon) is your expiratory reserve volume.

You deserve to tap into this reserve volume when you exercise and also your tidal volume increases.

To amount up: Your expiratory reserve volume is the amount of extra air — above anormal breath — exhaled in the time of a forceful breath out.

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


Respiratory quantities are the amount of air inhaled, exhaled, and also stored in your lungs. Alengthy with expiratory reserve volume, some terms that are frequently component of a ventilatory pulmonary attribute test and deserve to be useful to understand include:

Inspiratory reserve volume. The amount of added air inhaled — over tidal volume — throughout a forceful breath in. When you exercise, you have actually a reserve volume to tap into as your tidal volume increases. The average inspiratory reserve volume is around 3000 mL in males and 2100 mL in females.Vital capacity. The total usable volume of the lungs that you deserve to regulate. This is not the whole lung volume as it is difficult to voluntarily breathe all of the air out of your lungs. The average crucial capacity volume is about 4600 mL in males and 3400 mL in females.Total lung capacity. The total volume of your lungs: your essential capacity plus the amount of air you cannot voluntarily exhale. The average total lung capacity volume is around 5800 mL in males and 4300 mL in females.

If your medical professional sees indications of a chronic lung problem, they will use spirometry to identify exactly how well your lungs work-related.Spiromeattempt is an essential diagnostic tool for identifying:

Once diagnosed through achronic lung disorder, spirometry might be offered to monitor development and to determine if your breapoint difficulties are being correctly treated.


The amount of lung capacity varies from perboy to person based upon their physical makeup and their atmosphere.

You are likely to have a larger volume if you:

are talllive at a higher altitudeare physically fit

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

are short

Your expiratory reserve volume is the amount of additional air — above-normal volume — exhaled during a forceful breath out.

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Measured via spirometry, your ERV is part of the data gathered in pulmonary function tests supplied to diagnose restrictive pulmonary diseases and also obstructive lung conditions.


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Medically reregarded by Gerdifficult Whitworth, R.N. — Written by Scott Frothingham — Updated on October 19, 2018