13.15 : 呼吸量

Respiratory volume is the amount of air an individual inhales or exhales, generally measured in liters.

Five respiratory volumes serve as important markers of respiratory health.

The first is the tidal volume, or TV, which is the air inhaled or exhaled in one breath. Typically, an adult inhales about 500 milliliters of air per breath.

Next is the minute volume, or MV, which measures the air inhaled and exhaled per minute. The normal MV value ranges from 5 to 8 liters.

Then comes the inspiratory reserve volume, or IRV, the maximum air an individual can inhale in a single breath. The average IRV value is approximately 3000 milliliters.

Conversely, the expiratory reserve volume, or ERV, is the maximum air forcibly exhaled beyond normal exhalation. Typically, ERV ranges from 1200 to 1500 milliliters.

Lastly, the residual volume is the air left in the lungs even after forceful exhalation. The normal range is usually 1000 to 1200 milliliters.