Modern cities are chaotic and noisy, the air is turbid and the environment is polluted. People with accelerated pace of life are in a state of tension for a long time, especially those elderly people with chronic diseases and weak resistance, and they are bored. People who have not returned to the embrace of nature for a long time can say that their life expectancy will also be shortened. Therefore, some doctors call "walking in the forest" as "a good medicine for urbanites to relieve irritability and promote health".
So, what effect does the forest have on the human body?
Everyone has experienced the fresh air and soft sunshine in the forest. How comfortable you will feel when you walk barefoot on the grass and wild flowers. These are the "signals" that the forest acts on the human body. These signals can be felt by many special "antennas" distributed on the skin, especially in the ears, soles of feet, palms, nasal mucosa, iris and other organs. These "antennas" are closely related to the brain and spinal cord centers that control the whole body activities, endocrine glands that secrete hormones, and the immune system that defends against foreign bacteria and viruses and maintains the normal activities of cells and tissues in the body. In recent years, scientists have confirmed that various diseases, such as aging, tumor deterioration, atherosclerosis, arthritis, etc., are related to immune system disorders.
The human body is a complete and unified receptor, and the forest natural health care environment has many functions for it. People come here as if immersed in a wonderful world, where it is warm in winter and cool in summer, the air pressure changes little, the lush canopy scatters the strong sunlight of the sun, and the green Ye Can eliminates eye fatigue, relaxes the nervous system, and strengthens metabolism, blood circulation and breathing.
As early as 1928, the former Soviet scientist Wan Tuojing discovered that garlic, onion, pine trees, thick pears and other plants have a strong bactericidal effect, and called them "plant antibiotics". In addition to sterilization, these volatile substances can also stimulate people's sense organs such as sense of smell, affecting breathing, blood circulation and immune system. The amount of volatiles produced by different tree species varies greatly. For example, 1 hectare of broad-leaved forest can produce 2kg of phytoncide and more than 5kg of coniferous forest (30kg of juniper forest) in one day and night. Pine, spruce, oak, thick pear, birch, machinery, juniper and fir are all highly bactericidal tree species.
Chernovo, an academician of the former Soviet Academy of Sciences, and german, an associate doctor of medicine, introduced the health care function of coniferous forest to various patients in different seasons. For example, in September-10 or cold season (from mid-February to mid-February, 18), the forest produces less fungicides, which is suitable for patients with cardiovascular diseases, especially in severe winter, and they feel very good here. In the transitional months (10, March), coniferous forests are wetter than broad-leaved forests, and cold and humidity are particularly unfavorable to patients with respiratory diseases. From April to mid-May, the resin secreted by coniferous forests increased. This kind of breath can stimulate the blood supply of respiratory tract, and has the effect of eliminating phlegm and relieving cough, but it often causes asthma in patients with bronchitis. People breathe resin breath and have diuretic effect. But nephritis patients should not stay in coniferous forest for a long time in summer. The hot summer season in June and July is the peak of resin secretion, and patients with hypertension, local cardiogenic anemia and bronchitis should not go to coniferous forest. Because the strong resin smell will aggravate asthma, causing headache, dizziness, heartburn, arrhythmia, tinnitus and even insomnia, often accompanied by elevated arterial blood pressure. As we all know, cells need enough oxygen to maintain their normal work. 1 ha, oak forest can produce 830 kg of oxygen, birch forest -725 kg, pine forest -540 kg 1 year, but too high oxygen concentration in blood can also lead to cerebral vasospasm and even coma.
The air around birch and oak trees is particularly rich in light gas ions. Volatile substances from plants contribute to air ionization, and there is almost no dust in forest air, so there are few heavy ions harmful to human health. It should be noted that 1 hectare coniferous forest 1 year can filter 30-35 tons of dust, and broad-leaved forest can filter 50-70 tons.
When introducing the unique health care significance of nature, M. Brno, an associate professor of medicine in the former Soviet Union, said: "What can be used to relieve a person's complicated and tense psychological state? Of course, we usually turn to binding articles (alcohol, cigarettes, medicine, etc.). ), but these methods are vulgar and harmful Another primitive and natural way is to embrace nature. "