A common symptom of pneumonia patients infected with novel coronavirus is "decreased blood oxygen content". Blood oxygen content, body temperature, pulse, respiration, blood pressure and pain are also called six vital signs, but this concept is not well known to most people. What does oxygen content mean? What effect does it have on the human body? Xinhua Sports interviewed several doctors and researchers to hear what they said.
"Blood oxygen content refers to the total oxygen content in blood, including oxygen physically dissolved in blood and oxygen combined with hemoglobin." Zhang Yihong, a researcher at the Institute of Sports Medicine and Health of Adult Sports Institute, introduced. Oxygen inhaled into the lungs will eventually combine with hemoglobin in red blood cells and then be distributed to various organs and tissues of the body. Only in this way can cells survive and work normally.
Generally speaking, the normal value of human blood oxygen content is: arterial blood150-230ml/l; Venous blood 100- 180ml/L The arterial oxygen content of the same person is about 50ml/L higher than the venous oxygen content, and the male is higher than the female.
Compared with blood oxygen content, a more commonly used index in clinic is blood oxygen saturation, which refers to the saturation percentage of hemoglobin combined with oxygen. Under normal circumstances, the oxygen saturation of arterial blood is about 95%- 100%, and that of venous blood is about 75%.
△ Oxygen inhaled into the lungs will eventually combine with hemoglobin in red blood cells.
After understanding the concept of blood oxygen content, the next question is, what effect does blood oxygen content have on human body?
Because all cells in the human body rely on oxygen to sustain life, the oxygen content in blood will affect almost every part of the body. Guo Lu, chief physician of the Department of Respiratory and Critical Care Medicine of Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, said that low oxygen saturation can lead to serious systemic complications, such as headache, dizziness, irritability, mental disorder and even coma; Hypoxia of cardiovascular system will lead to myocardial ischemia, and serious cardiac arrest and heart failure will occur; Hypoxia of respiratory system can lead to respiratory failure, respiratory arrest and so on.
In the research report of sudden sports death in China, there are cases showing that athletes' hearts have no organic lesions and abnormalities. The cause of death may be that the exercise load exceeds its endurance, and the blood volume and oxygen demand required by the cardiac circulatory system suddenly increase, while the supply volume is relatively reduced. In this state of insufficient blood oxygen supply, athletes will have acute ischemia, cardiac arrest and cerebral blood interruption, and then sudden cardiac death and sudden cerebral death will occur.
△ When inhaling, I feel my stomach bulge outward, and then spit it out at one time.
But at the same time, the blood oxygen content is not as high as possible, but should be kept within the normal range. Because excessive oxygen inhalation (such as pure oxygen inhalation) will cause oxygen poisoning for a certain period of time, but it is harmful to health. Ordinary people should keep the blood oxygen content at a normal level, one is to keep the air fresh and circulating, the other is to strengthen cardiopulmonary exercise, and enhance the ability of breathing and blood transportation.
Liao, deputy dean of the School of Sports Medicine of Chengdu Institute of Physical Education, said that regular exercise, especially aerobic exercise, can effectively improve the function of respiratory system and improve the ability to resist diseases to some extent. Therefore, in the face of novel coronavirus epidemic, we should encourage everyone to keep regular exercise, especially aerobic exercise. You can also practice some breathing depth, rhythm, respiratory muscle strength and endurance specifically for the respiratory system to improve the ability of the respiratory system. For example, blow out the candle, put the candle at a distance of 10cm and try to blow it out.
For ordinary people who usually exercise less, suddenly increase their exercise, or lack professional guidance during exercise, if possible, they can do an blood oxygen test.
For the convenience of life, there are some home detection devices such as "finger oximeter" to help people detect oxygen saturation at home. In addition, it is also a good choice to use wearable devices with oxygen saturation data detection function, such as smart sports bracelets, to track their oxygen saturation. (Wang Jianbing)