What is the lung capacity of children?

We all know that vital capacity is the simplest way to detect lung development, especially many children often test their vital capacity during physical examinations. Once the vital capacity is low, it is easy to cause hypoxia and even pneumonia when catching a cold, which is also very bad for health. Therefore, we must grasp the vital capacity of children in our daily life, so that we can better help children exercise to improve their physical fitness. Let's learn about the vital capacity of children.

What is the lung capacity of children?

The size of lung capacity is closely related to height, weight, and chest circumference, so the impact of these factors on lung capacity should be fully considered during evaluation.

The total amount of air you exhale after taking a deep breath. Vital capacity is the maximum ventilation volume in one breath, which can reflect the potential capacity of respiratory function to a certain extent. The lung capacity of an adult male is about 3500 ml, and that of an adult female is about 2500 ml.

The lung capacity of middle-aged people is the largest, while that of young and elderly people is smaller. The better the health of a person, the greater his lung capacity. Lung tissue damage such as tuberculosis, pulmonary fibrosis, atelectasis or lobectomy to a certain extent may reduce lung capacity. Kyphosis, pleural thickening, exudative pleurisy or pneumothorax may also limit lung expansion and reduce lung capacity.

Therefore, a significant decrease in vital capacity is a manifestation of restrictive ventilation disorder. Since the measurement method of vital capacity is simple and has good repeatability, it is a commonly used indicator in health examinations. Because vital capacity measurement does not limit the exhalation speed, it cannot detect diseases of respiratory tract ventilation obstruction. Therefore, the timed spirometry method is more ideal as a dynamic indicator of lung function. Timed vital capacity is the maximum inhalation followed by the fastest exhalation until the exhalation is complete. At the same time, record the exhaled volume at the end of 1, 2, and 3 seconds respectively.

A normal person should exhale 83%, 96% and 99% of his or her lung capacity respectively. People with obstructive pulmonary disease often need 5 to 6 seconds or more to exhale all their lung capacity; in many pathological conditions where respiratory movement is limited, the lung capacity in the first second increases, and the entire lung capacity can be exhaled ahead of time. Therefore, timed vital capacity can be used as a reference for identifying obstructive or restrictive ventilation disorders.

The above is an introduction to children's lung capacity. I hope it can be of some help to many friends. By mastering more such attempts, we can grasp the health status of children in time. In daily life, children must pay attention to running or swimming and other exercises. This can greatly improve lung capacity, improve their physical fitness and make themselves healthier.