What is the correct way to measure vital capacity?

Static breathing method: Hold the right nostril with the right thumb, take a deep breath slowly through the left nostril, and consciously imagine that the air is flowing to the forehead. When the air in the lungs is saturated, press the left nostril with the index finger and middle finger of the right hand, hold your breath for 10 second, and then exhale. Then hold down the left nostril and start over. Do it five times per side.

Exercise breathing method: when walking or jogging, actively increase the breathing volume, breathe slowly and breathe quickly, slowly inhale and gradually expand the chest with inhalation, and exhale quickly. Exercise at least 20 times each time, several times a day.

Extended data:

Precautions:

Adult male's vital capacity is about 3500ml, and female's is about 2500ml. Adults have the largest lung capacity, while young people and the elderly have smaller lung capacity. The better people's health, the greater their vital capacity. When lung tissue injury such as tuberculosis, pulmonary fibrosis, atelectasis or lobectomy reaches a certain level, it may reduce its vital capacity, hunchback, pleural thickening, exudative pleurisy or pneumothorax. It may also limit lung expansion and reduce vital capacity.

Therefore, the obvious decrease of vital capacity is the manifestation of restrictive ventilation disorder. Because the measurement method of vital capacity is simple and repeatable, it is a common index of health examination. Because the expiratory speed is not limited, it is impossible to find the diseases of respiratory ventilation by measuring vital capacity, so it is ideal to use time vital capacity measurement as the dynamic index of lung function. Time vital capacity is to exhale at the fastest speed after the maximum inhalation until the end of breathing.

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