Even if physical strength permits, you should go ashore for half an hour or so to rest, replenish some water and drink sports drinks properly.
Once you feel unwell during swimming, you should go ashore immediately, dry the water on your body, bask in the sun properly, and get dressed as soon as possible after you get warm to prevent colds, tachycardia, muscle strain and other diseases.
Attention should be paid to the following aspects when swimming:
1, pay attention to the water temperature when swimming.
Some people stay in the water for too long, and their bodies are stimulated by cold for a long time, which can also cause severe gastrointestinal spasm and abdominal pain.
2. Do warm-up exercises before swimming to prevent muscle twitching and avoid dizziness and shock caused by temperature difference.
Don't swim when you are hungry or full. Old people are prone to hypoglycemia when they exercise in a hungry state. Excessive exercise will affect the blood supply of gastrointestinal tract, increase abdominal pressure and cause acute abdomen.
It is recommended to swim between 1~2 hours after meals. Pay attention to sun protection when swimming in season to avoid causing acute dermatitis.
In addition, the elderly should not try to be brave, do not dive, and hold their breath to prevent the increase of lung pressure and increase the burden on the heart. After swimming, remember to rinse your mouth and take a bath to avoid bacteria invading your body and skin irritation caused by disinfectant.
Extended data
① Pay attention to the water temperature when swimming.
When swimming outdoors, although you won't feel hot after soaking in water for a long time, the temperature of your head can sometimes rise above 39℃ after being exposed to the sun for several hours on the water. Besides, the swimmer's physical exertion makes him sweat badly.
This can not only relieve summer heat, but also easily lead to heatstroke, headache, dizziness, fatigue and uncoordinated movements. In severe cases, there will be symptoms such as disturbance of consciousness and coma.
In addition, the water temperature is usually lower than the skin temperature. After a swimmer enters the water, a lot of heat will be emitted from the body surface in a short time, and the human body will have a protective reaction. You can regulate your body temperature by contracting blood vessels and closing sweat pores.
So when you first enter the water, your skin will turn white. After swimming in the water for a period of time, the blood circulation will be accelerated, the heat will gradually increase, the skin will turn from white to red, and the body will feel a little warm. At this time, people can maintain activities in the water for a period of time.
If you stay in the water for a long time, the heat generated by your body can't catch up with the heat lost in the water, and the thermoregulation function will be destroyed, resulting in arterial contraction and venule expansion, so that the blood will stagnate in the subcutaneous vein.
Causes blue skin, black lips and goose bumps. At the same time, muscle fatigue and excessive lactic acid accumulation will lead to leg cramps and even accidents such as drowning.
In addition, if someone stays in the water for too long, the body will be stimulated by cold for a long time, and it will also cause severe gastrointestinal spasm and abdominal pain.
② Swimming time should not be too long.
Some people soak in water for several hours or even most of the day, thinking that the longer they soak, the more they can exercise and help cool down in summer. As we all know, swimming for too long is not only harmful to the body, but also harmful to the body sometimes.
The tap water supply system used in most indoor swimming pools is disinfected with chlorine. When people are in direct contact with chlorine when swimming, chlorine will volatilize from water and be absorbed directly by the skin.
Inhaling a small amount of chlorine for a short time has little effect on human health, but soaking in water for a long time is not good for human health.
At the same time, there are many tourists in the indoor swimming pool, which will inevitably bring skin excrement, shed hair, snot and even urine and swimsuit dyes into the water. Polluted water can cause diseases such as eyes, nose, ears, throat, skin, gastrointestinal tract and reproductive system.
Especially children, have weak resistance. If they stay in the water for too long, they are more vulnerable to the attack of dirt and bacteria in the water and get sick.
Therefore, children should pay more attention to moderate swimming time. After swimming, they must wash their whole bodies thoroughly with running water to keep their skin clean and hygienic.
Staying in water for a long time (including indoor swimming pools), especially swimming in relatively cold water, is not necessarily good for your health, and sometimes it may be counterproductive.
Therefore, experts remind people that when swimming outdoors, they should choose to do it in the morning or at night to avoid the hot sun directly hitting their heads, and soak their heads with water every few minutes to prevent their heads from getting too hot.
At the same time, the swimming time should be controlled at 30~45 minutes. The lower the water temperature, the more compressed the swimming time, especially for those who are physically weak.
Even if physical strength permits, you should go ashore for half an hour or so to rest, replenish some water and drink sports drinks properly.
Once you feel unwell during swimming, you should go ashore immediately, dry the water on your body, bask in the sun properly, and get dressed as soon as possible after you get warm to prevent colds, tachycardia, muscle strain and other diseases.
③ It is not advisable to swim immediately after physical labor.
Many people just finished physical labor, and in the case of sweating, in order to have fun, they plunged into the water, thinking that swimming, bathing and cooling off the heat are all right.
As we all know, although it can make people cool and comfortable temporarily, it is not good for physical recovery and health.
This is because people consume a lot of energy in the process of physical labor, and their metabolism is vigorous, blood flow is accelerated, heat production in the body is greatly increased, capillaries in the skin are dilated, sweat pores are also opened, and a lot of perspiration is carried out, which is beneficial to the timely release of body heat.
If you swim in the water immediately after work, your skin will be stimulated by cold water, capillaries will suddenly contract and sweat pores will close, which will affect the normal distribution of body heat. Therefore, although many people feel cool when swimming, they will soon feel more sultry and uncomfortable.
Moreover, when doing manual labor, the muscles are tense, the heart rate is obviously accelerated, and the physical strength is greatly consumed, which makes people feel tired. At the end of labor, although muscle tension and heart rate have eased, it still takes some time to return to normal levels.
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