Breath-hold test

The breath holding test is a test that measures the breath holding time of a subject after a deep breath or a deep exhalation. When a person is holding his breath, the partial pressure of carbon dioxide in the alveoli gradually increases, resulting in hypoxia, which will cause breathing, circulation and A series of reactions of the nervous system, etc. Therefore, the results of the breath holding test can reflect the body's tolerance to hypoxia and the level of alkali reserve. People with strong tolerance to hypoxia, large lung capacity, and high level of alkali reserve hold their breath for a long time On the other hand, the breath-holding time is short. Some people have observed that the breath-holding time is the longest after inhaling 75% of my vital capacity. The breath-holding test is an auxiliary examination method of respiratory system function.