Respiratory Volumes & Capacities

Tidal Volume:

  • Volume of air inspired or expired during a normal respiration is known as “Tidal Volume”.
  • Approximately 6000 to 8000 mL of air per minute is inspired or expired by a healthy man.

Inspiratory Reserve Volume (IRV):

  • Additional volume of air, a person can inspire by a forcible inspiration is known as “Inspiratory Reserve Volume”.
  • Average is 2500 mL to 3000 mL.

Expiratory Reserve Volume (ERV):

  • Additional Volume of air, a person can expire by a forcible expiration is known as “Expiratory Reserve Volume”.
  • Average is 1000 mL to 1100 mL.

Residual Volume (RV):

  • Volume of air remaining in the lungs even after a forcible expiration is known as “Residual Volume”.
  • Average is 1100 mL to 1200 mL.

Inspiratory Capacity (IC):

  • Total volume of air a person can inspire after a normal expiration is known as “Inspiratory Capacity”.
  • It includes tidal volume and inspiratory reserve volume.

Expiratory Capacity (EC):

  • Total volume of air a person can expire after a normal inspiration is known as “Expiratory Capacity”.
  • It includes tidal volume and expiratory reserve volume.

Functional Residual Capacity (FRC):

  • Volume of air that will remain in the lungs after a normal expiration is known as “Functional Residual Capacity”.
  • It includes Expiratory Reserve Volume and Residual Volume.

Vital Capacity (VC):

  • The maximum volume of air a person can breathe in after a forced expiration is known as “Vital Capacity”.
  • It includes Expiratory Reserve Volume, Tidal Volume and Inspiratory Reserve Volume or the maximum volume of air a person can breathe out after a forced inspiration.

Total Lung Capacity:

  • Total volume of air accommodated in the lungs at the end of a forced inspiration is known as “Total Lung Capacity”.
  • It includes Residual Volume, Expiratory Reserve Volume, Tidal Volume and Inspiratory Reserve Volume or Vital Capacity and Residual Volume.

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

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