A Winter Olympics, let us see the charm of ice and snow sports.
Now that the Beijing Winter Olympics are in full swing, skiing has attracted a lot of attention.
Some people say that there will be shortcomings in life without sliding through the snow, and in the silver-clad world, you wear a snow hat and pedal skis on the snow.
However, skiing, in addition to giving us speed and stimulation enjoyment, also has certain risks in itself.
In addition to the possibility of falling injuries, skiing also has frostbite, sunburn and other situations.
Is it better to host the Winter Olympics when the weather is colder?
We all know that the Winter Olympics focus more on ice and snow sports than the Summer Olympics, so the countries that basically host the Winter Olympics are concentrated in countries at high latitudes.
Since many events focus on ice and snow, the Winter Olympics will be more affected by meteorological conditions, and wind speed, wind strength, temperature, visibility, etc. will directly affect the performance of athletes.
Therefore, in view of the date of the Winter Olympic Games, the National Olympic Organizing Committee is carrying out the core meteorological indicators of the competition, mainly in two types:
The average temperature in January and February is below 0 °C;
In February, the snowfall is about 30 cm.
The temperature is too low is not conducive to the athletes' level of play, easy to lead to frostbite, so according to the requirements of the International Olympic Organizing Committee, the limit temperature of the Winter Olympics can not be lower than minus 17 ° C.
Why do you still get sunburned during winter races?
Despite the low temperatures in winter, the intensity of ultraviolet rays does not decrease in the slightest.
Especially in outdoor skiing, ultraviolet rays can be up to 3 times as strong as those reflected through large areas of snow.
In alpine skiing in particular, for every 1,000 meters increase in altitude, ultraviolet rays increase by 10%.
In addition, strong ultraviolet rays have a very serious damage to the cornea of the eye, if the strong ultraviolet rays to the eyes, will make the patient appear tears, photophobia, as well as eye redness, swelling, pain phenomenon.
If the symptoms are severe, it will also cause necrosis of the corneal epithelium, resulting in chronic conjunctivitis, resulting in corneal deformation, intermittent blurring of vision, and the damage to vision is very large.
In addition, if you are exposed to strong exposure to ultraviolet rays for a long time, it will induce the appearance of cataracts.
What health risks will be caused by excessive ultraviolet rays?
Properly receiving sunlight every day can synthesize the vitamin D needed in the human body, which can promote the body's absorption of calcium and achieve a good calcium supplementation effect.
However, if you are overstretched, you will suffer from ultraviolet radiation, which is harmful to human health, and when it is serious, it will even lead to the emergence of cancer.
In addition to eye damage, what are the damages of ultraviolet rays to the human body?
1. Skin injuries
If you are exposed to strong ultraviolet radiation for a long time, it will cause great damage to the skin.
When exposed to a large amount of ultraviolet light, the skin will produce more free radicals, which makes melanocytes produce a lot of melanin.
These melanins are distributed in the stratum corneum on the outside of the skin, forming black spots, which is also a reason why excessive exposure to ultraviolet rays will be tanned.
In addition, long-term ultraviolet radiation will destroy skin cells, resulting in a large number of necrosis of dermal cells. As a result, the skin appears wrinkled, sagging, dry, losing elasticity and aging.
If you suddenly receive strong ultraviolet rays, it will cause the skin to appear red, swollen, painful and other allergic phenomena. When severe, it can even lead to the appearance of skin cancer.
Second, the immune function is reduced
Ultraviolet rays will cause great damage to the skin and eyes of the human body, in addition, it will also cause deep damage to genetic factors and increase the chance of cancer. Affects the body's immune system, resulting in a decline in immunity.
Third, nervous system damage
When exposed to ultraviolet rays for a long time, it affects the nervous system in the human brain. A rapid increase in body temperature occurs, causing dizziness, headache, dizziness, and in severe cases, fainting.
In summary, when the human body receives too much ultraviolet radiation, it will cause damage to the skin as well as the eyes, immune function and nervous system.
When severe, it can even lead to the appearance of skin cancer. In addition to properly avoiding the damage of ultraviolet rays in sunlight, you should also avoid the damage of ultraviolet lamps.
The ultraviolet energy emitted by the ultraviolet lamp is very large, which will cause serious injuries to the skin. In mild cases, local scaling, redness, and pain of the skin appear.
If the UV stimulation lasts longer, it will increase the chance of skin cancer.