Shadow human body senses temperature. The weather in China is very good. What does this index mean?

The temperature perceived by the shadow human body refers to people's feelings about the air temperature in the shadow.

In summer, people feel the most comfortable temperature is 19-24℃, and in winter it is 17-22℃. The human body always keeps its body temperature constant. When the ambient temperature exceeds the upper limit of comfortable temperature, people will feel hot, and when it exceeds 37℃, people will feel extremely hot. The upper limit of temperature that people can tolerate is 52℃. On the contrary, when the ambient temperature is lower than the lower limit of comfortable temperature, people will feel cold and cold; If it is below 0℃, it will feel cold. For people who are generally engaged in outdoor activities and wear appropriate clothes, the lower limit of tolerable temperature is about MINUS 34℃.

The comfortable temperature of different parts of the human body is not consistent. Using skin surface thermometer, the comfortable temperature of different parts is: head, chest, abdomen, back and buttocks, 34.6℃; Thigh and upper arm, 33.0℃; Legs and forearms, 30.8℃; Hands and feet, 28.6℃.

With environmental thermometer, the comfortable temperature range is 17 ~ 26. 1℃ in summer and 15.6 ~ 23.3℃ in winter.

Extended data:

According to the research of physiologists, around 30℃ is the best environmental temperature for human body, and it is also the temperature closest to human skin.

33℃- Sweat glands start working at this temperature for 2-3 hours, and the human body is in an "air-conditioned state"-sweat glands begin to emit accumulated body temperature through slight sweating.

35℃- the heat dissipation function reacts immediately. At this time, the superficial vein dilates, the skin sweats, the heart beats faster, and the blood circulation accelerates. For some elderly and infirm people with poor heat dissipation, it is necessary to cooperate with local cooling or turn on indoor air conditioning to reduce human body temperature.

36℃- 1 alarm At this temperature, the human body "cools itself" by evaporating sweat to release heat. Sweat, sodium, vitamins and other minerals will be excreted every day, and the blood volume will also decrease. At this time, drinks containing salt, vitamins and minerals should be supplemented in time to prevent electrolyte disorder in the body, and other cooling measures should also be started.

38℃-When the second alarm temperature rises to 38℃, it is difficult for human sweat glands to sweat to ensure normal body temperature. Not only does the lungs "gasp" and exhale heat, but even the heart should speed up and output 60% more blood to the body surface than usual to participate in heat dissipation. At this time, cooling measures, cardiac drug health care and treatment can not be relaxed at all.

39℃-3 alarm sweat glands are working hard, and it is easy to have a heart attack at this time.

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