The human is a hot-blooded animal and can keep the body temperature constantly, although in a changing atmosphere.
The physical training, the infections and other circumstances cause more heat to the organism. The metabolism can elevate between five and twenty and that creates more body heat.
An excess of atmosphere temperature, and / or relative humidity are factors that have influence in the heat accumulation, specially when we do physical training.
The heat excess has to be eliminated not to increase temperature and to change vitalitiy functions. The first mechanisms to heat elimination would be :
-Conduction: Heat is transferred to other object or person by physical contact directly, for example touching an ice.
-Convention: Heat is transferred by the movement of the air or when it has contact with water.For example :cycling,swimiming.
-Radiation: The body radiates its heat to the enviromental air.For example, if it is cold.
-Evaporation: Heat is eliminated changing sweat into steam. By breathing, the urine and faeces we also eliminate steam.
Resting and with enviromental temperature in the normal level, blood moves by conduction and convention the heat outside.
The bigger part of this is eliminated by radiation and convention. Its loss elevates if it is cold, more air and more surface in contact with other cold element. But for these factors are invested the body can get hotter (for example, sunbathing ).
During the training, the evaporation is more relevant, being neccesary the apparition of sweat. The sweat water is generated from the blood liquid, that moves to the skin when it begins to gather a heat excess.
This processmis regulated by the termoregulation mechanisms. The excess of humidity slows the evaporation down and the organism loses more water to dissipate the same amount of heat, dehydrating quicklier, affecting to termoregulation and preformance.
During the next chapter, we will go deeper in the consecuences of the liquids losing to the organism, that is a cuestion to have in mind specially when we are working with high temperatures and very hard efforts.
It will continue…