This is a piece of information about Qigong that I read in a book. I hope it helps you. Practicing qigong has an effect on the circulatory system. The physiological teaching and research group of a hospital in Shanghai measured that the blood pressure of exercisers rose immediately under conscious control, but decreased slowly. When blood pressure rises, the muscles of the whole body are still in a relaxed state. The pulse can be accelerated with the increase of blood pressure, enhancing the pulse power, or the blood pressure is increased, but the pulse is not fast and slow, enhancing the pulse power. This shows that it is possible to control cardiovascular function with consciousness when practicing martial arts. At the same time, it is also found that the adjustment of vascular tension in respiratory circulation is contrary to that of ordinary people, that is, blood vessels contract when exhaling and do not contract when inhaling. When the inspiratory time is longer than the expiratory time, the output per minute increases; Those who exhale longer than inhale have less output per minute. Whether the exerciser breathes for a long time or for a short time or even breathing, the heart rate drops, the peripheral blood vessels relax and the blood pressure drops, which has a antihypertensive effect on patients with hypertension, and the pressor reflex caused by cold stimulation is obviously reduced compared with that before exercise. Blood pressure changes in different locations are different. My blood pressure dropped when I stayed in Dantian. The increase of blood pressure while keeping nose suggests that we take Qigong as a "biofeedback method" or self-regulation method to prevent diseases. This information has been scientifically tested by others. In this information, there is a saying that the change of blood pressure varies with different parts of consciousness. My personal experience is that when I use cold qigong, when I transport the cold in my body to my abdomen for more than ten times (three inches below my navel), I will feel very clear when I open my eyes.