breath-hold test

The breath test is a test that measures the breath holding time of a subject after deep inhalation or deep exhalation. When people hold their breath, the partial pressure of carbon dioxide in the alveoli gradually rises, causing the body to be deprived of oxygen. At this time, it will cause a series of reactions of respiratory, circulatory and nervous systems. Therefore, the breath test results reflect the body's tolerance to hypoxia and alkali reserve levels. For those who have strong tolerance to hypoxia, large lung capacity, and high alkali reserve levels, the breath holding time is long; on the contrary, the breath holding time is short. It has been observed that the breath holding time is the longest after inhaling 75% of the lungs. The breath test is an auxiliary test for respiratory function. Basic Information Specialist Category: Respiratory Examination Category: Physical Examination Applicable gender: whether men and women apply fasting: not fasting Tips: During the test, the subject can hold the nose with his hand to avoid air leakage. Normal value In general, a healthy man has a breath-holding time of 35 to 45 s after a deep inhalation and a 25 to 30 s for a woman. After a deep exhalation, the man is 20 to 30 s and the woman is 15 to 25 s. The longer the breath hold time, the higher the tolerance to hypoxia and the higher the alkali reserve level. The athlete's breath time after deep inhalation can reach more than 60s, and can reach 40s or more after deep exhalation. Clinical significance Abnormal results: In general, a healthy man has a breath-holding time of 35 to 45 s after a deep inhalation and a 25 to 30 s for a woman. After a deep exhalation, the man is 20 to 30 s and the woman is 15 to 25 s. Below or above the above values ​​may be due to low respiratory function. The longer the breath hold time, the higher the tolerance to hypoxia and the higher the alkali reserve level. The athlete's breath time after deep inhalation can reach more than 60s, and can reach 40s or more after deep exhalation. In general, athletes take longer to do this test than healthy people, proving that their respiratory system is better. People who need to be examined have abdomen that feels uncomfortable and undergoes routine physical examination. High results may be diseases: Precautions for severe acute respiratory syndrome in children Requirements for inspection: — When testing, the subject can hold the nose with his hand to avoid air leakage. Second, the length of the breath hold time can be affected by the will, the sensitivity is poor, the error can reach 15s. Third, it is recommended to use the diaphragmatic muscle contraction to objectively assess the length of the breath holding time. Inspection process The subject rested quietly and naturally breathed. When the "start" password was heard, the tester opened the watch and the subject took a deep inhalation or deep breath and then held his breath until the breath could not be held again. Breathing time. Not suitable for the crowd Inappropriate people: those with mental disorders.

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