The average reference values of vital capacity of 7-year-old boys are 700- 1700ml, 8-year-old boys are 800-2000ml, and 9-year-old boys are 900-2300ml,1/00-2600ml, 165438+.
The average reference values of vital capacity of 7-year-old girls are 600- 1400ml, 8-year-old girls are 700- 1600ml, and 9-year-old girls are 800- 1800ml, 165438+.
It should be noted that the actual vital capacity may vary from person to person. The size of vital capacity is related to physical fitness, the strength of respiratory muscles and the development of lung tissue. Therefore, the better the body, the greater the vital capacity.
With the increase of age, the respiratory muscles of the human body are gradually developed, and the vital capacity is also increasing. Male lung capacity increases rapidly from 12 to 13 years old, and tends to be stable at 19 ~ 20 years old, about 3500~4500mL, while female lung capacity increases steadily, and gradually slows down after 15 years old, reaching18 ~/.
Precautions for vital capacity test:
1. Have a good rest before the exam to avoid fatigue and strenuous exercise, because these will affect the exam results.
2. Before the vital capacity test, it is best to avoid bad habits such as smoking and drinking, which will affect lung health and thus affect the test results.
3. Choose a suitable respirator during the test to ensure that it can be sealed and avoid air leakage, so as to ensure the accuracy of the test results.
4. During the test, keep breathing steady to avoid shortness of breath and wheezing, which will affect the test results.
5. If the tester has any history of physical discomfort or respiratory diseases, he should inform the doctor or tester before the test, so as to make personalized evaluation and adjustment.
6. spirometry is a simple and easy examination, but it can't replace other professional examinations. If the examination results are abnormal or in doubt, you should seek medical advice in time for professional examination and treatment.