In the resting state, the breathing frequency of normal adults is 12 ~ 18 beats/min, and the ratio of breathing to pulse is 1: 4. Newborns breathe about 44 times per minute, which gradually slows down with age.
Slow breathing is common in decreased metabolic rate, anesthesia overdose, shock and increased intracranial pressure.
Shortness of breath is mainly seen in fever, pain, anemia, hyperthyroidism, heart failure, pneumonia, pulmonary embolism, pleurisy, bronchial asthma and neuropsychiatric disorders.
Extended data:
Three effective methods of nourishing lung and breathing in winter;
1, take a deep breath
Take a deep breath often after getting up in the morning, slow down and inhale and exhale for 6.4 seconds as much as possible. This can inhale fresh air, exhale polluted air, increase the oxygen content in the blood, promote aerobic metabolism, and thus achieve the purpose of nourishing the lungs.
Deep breathing is best carried out in places with fresh air such as green spaces or rivers. Usually in the office, the ventilation condition is not good, the personnel density is high, and the shallow breathing method is used at ordinary times, so the ventilation volume is small, and it is easy to feel dizzy, weak, poor memory and low work efficiency.
You can also hold your breath, first hold your breath, then hold it, try to hold it until you can't stand it, then exhale, and go back and forth 18 times, which is helpful to enhance lung function.
2. Abdominal breathing
When inhaling, bulge your stomach, when exhaling, tuck in your stomach, pay attention to breathing through your nose instead of your mouth, and breathe slowly as long as possible. Your brain should be empty and quiet, and your whole body should relax and concentrate. Studies have shown that regular abdominal breathing can expand vital capacity, improve heart and lung function, and at the same time have the effect of refreshing the brain.
Step 3 breathe with contracted lips
Take a deep breath quickly, contract your lips into a whistle (or fish mouth), and then exhale a little. The principle is to change our usual shallow and fast breathing mode into deep and slow, so that the air stays in the lungs for a longer time, the gas exchange is more sufficient, and more carbon dioxide is discharged from the alveoli.
Baidu encyclopedia-respiratory rate
People's Daily Online-"Three Breathing Methods" of Lung Nourishing in Winter