What is the standard for primary school students' vital capacity?

Many primary school students lack exercise, which leads to insufficient lung capacity. Therefore, once a primary school student has insufficient lung capacity, it is easy to cause physical discomfort. Therefore, we should pay more attention to the lung capacity of primary school students. So what is the standard of lung capacity for primary school students? Let me introduce to you the lung capacity of primary school students.

Vital capacity refers to the total amount of gas exhaled after a maximum inhalation. Vital capacity = tidal volume + supplementary inspiratory volume + supplementary expiratory volume. Tidal volume refers to the amount of gas inhaled or exhaled with each breath. Supplementary inspiratory volume is also called inspiratory reserve volume, which refers to the amount of gas that can be inhaled after a maximum inhalation at the end of a quiet inspiration. Supplementary expiratory volume is also called expiratory reserve volume, which refers to the amount of gas that can be exhaled after a maximum exhalation at the end of a quiet exhalation. Vital capacity is the maximum ventilation volume in one breath.

In a certain sense, it can reflect the potential capacity of respiratory function. The vital capacity of adult men is about 3500 ml, and that of women is about 2500 ml. The vital capacity of middle-aged people is the largest, while that of young and old people is smaller. The healthier the person, the greater the vital capacity. Lung tissue damage such as tuberculosis, pulmonary fibrosis, atelectasis or lobectomy to a certain extent may reduce the vital capacity; kyphosis, pleural thickening, exudative pleurisy or pneumothorax, etc., can also limit lung expansion and reduce vital capacity. Therefore, a significant reduction in vital capacity is a manifestation of restrictive ventilation disorder.

Since the vital capacity measurement method is simple and has good repeatability, it is a commonly used indicator for health checks. Since the vital capacity measurement does not limit the exhalation speed, it cannot detect diseases of poor respiratory ventilation. Therefore, the timed vital capacity measurement method is more ideal as a dynamic indicator of lung function. Timed vital capacity is the fastest exhalation after the maximum inhalation until the exhalation is completed. At the same time, the exhaled volume at the end of the 1st, 2nd, and 3rd seconds is recorded respectively. A normal person should exhale 83%, 96%, and 99% of his vital capacity respectively. People with obstructive pulmonary disease often need 5 to 6 seconds or more to exhale all their vital capacity; in many pathological conditions where respiratory movement is limited, the timed vital capacity in the first second increases, and the entire vital capacity can be exhaled in advance.

The above is my opinion on this issue. If primary school students have the above-mentioned problem of insufficient lung capacity, they should pay attention to timely examination. This will ensure the safety of primary school students and avoid dangerous situations caused by the above-mentioned problems. Finally, I wish the primary school students good health.