First, the primary school students' vital capacity standard
According to the national students' physical health standard, the vital capacity standard of primary school students varies according to gender and grade, which is not just a standard, but is subdivided into three grades: passing, good and excellent.
For boys from grade one to grade six, the passing lines are 700, 800, 900, 1 100, 65438+3000ml respectively, and the good lines are 1300, 1500, 65438+ respectively.
For girls from grade one to grade six, the passing lines are 600, 700, 800, 900, 1050 and 65438+2300ml respectively, and the good lines are 1000, 1200, 1400 and/respectively.
Second, vital capacity.
Vital capacity (vital? Volume) refers to the amount of air you are trying to exhale after the maximum inhalation. Include tidal volume, inspiratory volume and expiratory volume.
Tidal volume refers to the amount of air inhaled or exhaled by the lungs in a breathing cycle. The maximum air volume inhaled after tidal volume is supplementary inspiratory volume, the maximum air volume exhaled after tidal volume is supplementary expiratory volume, and the maximum air volume left in the lungs after exhalation is residual volume.
Individuals vary greatly. It is influenced by age, sex, figure, respiratory muscle strength and lung and chest elasticity. Generally speaking, the stronger the body, the bigger it is. The research shows that it has a high correlation with the maximum oxygen front width. It is often used as an index to evaluate people's quality.
Third, the importance of vital capacity.
Lung capacity is closely related to people's breathing. Physiological research shows that all organs, systems, tissues and cells of the human body consume oxygen all the time, and only when the oxygen supply is sufficient can the body work normally.
The oxygen supply in the human body depends entirely on the breathing of the lungs. In the process of breathing, the lungs not only inhale oxygen, but also expel carbon dioxide metabolized in the body.
We can think that the lung is a transit station for gas exchange in the body, and the volume of this transit station determines the amount of breathing gas exchanged each time, which is the most intuitive and objective index for detecting lung function.