Why is tidal volume important?

Tidal volume plays a central role in supplying the body with oxygen. With every breath, fresh, oxygen-rich air enters the lungs. There, oxygen is absorbed into the blood and carbon dioxide, a waste product of metabolism, is released. If the tidal volume is too low, the body may not receive enough oxygen. In healthy people, the body automatically makes sure the right amount of air is taken in, either by breathing more deeply or by breathing more quickly.

Tidal volume is also an important measurement in medicine. It is measured, for example, during lung function tests, in ventilation medicine, or when monitoring patients in intensive care units. The values help to better assess breathing and to identify possible problems at an early stage.

How is tidal volume measured?

Tidal volume is usually measured using a device called a spirometer. This is a device that you breathe into calmly and steadily. It measures how much air is breathed in and out with each breath. The test is simple, painless, and takes only a few minutes. It is often carried out during routine check-ups, for respiratory conditions such as asthma or COPD, or before operations.

In people who are on mechanical ventilation, the tidal volume is set and monitored directly on the ventilator. This allows the supply to be tailored to each person's individual needs.

What affects tidal volume?

Several factors influence how large the tidal volume is. Age, height, sex, and physical fitness all play a role. During physical activity, such as exercise, tidal volume increases noticeably in order to meet the body's greater need for oxygen. Breathing also becomes faster at these times.

Certain illnesses can reduce tidal volume. These include, for example, chronic lung conditions or restricted movement of the chest wall. In such cases, shortness of breath or a feeling of breathlessness may occur. In healthy people, however, tidal volume generally adapts flexibly to whatever the body needs at any given moment.

When is tidal volume considered unusual?

In medical reports or letters from doctors, tidal volume is usually recorded as part of a lung function test. A noticeably low value can indicate a lung condition or a breathing disorder. A tidal volume that is too high is rare and usually only occurs during deliberate, deep breathing or under certain conditions, such as during ventilation therapy.

For most people, tidal volume is not a cause for concern. It is a natural part of breathing and changes constantly throughout the day, depending on what the body needs at any given time.

What can you do to support your breathing?

Healthy lungs benefit from movement and fresh air. Regular walks, moderate exercise, and targeted breathing exercises can help to maintain or even improve breathing capacity. If you smoke, it is worth trying to give up, as tobacco smoke damages the lungs and can reduce tidal volume over time.

Good posture and avoiding excess weight also have a positive effect on breathing. If you experience ongoing symptoms such as breathlessness, a persistent cough, or a noticeably low result in a lung function test, it is a good idea to seek medical advice.

Tidal volume is an important function of the body, but one that usually happens without you being aware of it. As long as breathing is working well, there is generally no need to worry about it.