Why are some people more cautious than others?

We are not born and do not all remain equal in the cold. Some people are indeed more cautious than others. Why, when human organisms are at around 37 ° C, do we face the sensations of freshness differently?

First, it is important to understand which mechanisms are involved in thermal regulation.

Cold, the human body and thermal regulation

of the sensors detect the temperature of the skin and organs and send information to thehypothalamus, a small region of brain responsible for controlling body temperature. If he does too much cold, the blood vessels contract (vasoconstriction) in the most exposed regions such as the extremities, while the blood circulates in priority in the vital organs.

Chills, formed by the reflex contraction of skeletal muscles, provide a little heat. Conversely, excessive temperature promotes vasodilatation, and the excess heat is evacuated by sweat, which takes upthermal energy to the body by evaporating.

Sport to stop being chilly

However, there is inter-individual variability. Depending of Genoa and experience, differences in sensitivity to cold can occur. A layer of fat plays the role of a good insulating thermal; that's why Marine mammals have a very thick one.

Regular activity physical, which gives a more developed musculature, allows to increase its metabolism basic. So, at rest, a person athletic will produce more heat than its more sedentary counterpart. Finally, thermoregulation is also dependent on the thyroid. This organ can react a little differently from one individual to another.

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