The heating system of our body
Why notice cold or hot?
imagine that we are on the field in a very cold day and played with bare hands
, a stick of wood and one iron of the same fence. How is it possible that
notice the ironwood colder than wood when both are at the same temperature
?
The explanation is simple: the iron is a much more thermally conductive material, the
cold and heat-wood. The cold is not noticed
that an exchange of temperature between the material cooler than us: to play the ironwood, our heat
going cold on the stick and the stick goes into our bodies. If the stick is made of wood, despite being
at the same temperature than its counterpart of iron, so cold we did not notice that
wood is not conductive materials such as iron.
air-oxygen, is also a conductor of cold or heat.
For this reason, a windy day makes more sense of cold in the same way, home heating is based on heating the air in the house.
In short, we need a thermal conductive element warm when we are on the mountain. This element, as we shall see, will the air. How
warms the body? Forget
but a widespread misconception: any clothing
provides heat by itself, the heat is generated by the body through the blood circulation.
Now, if we are in winter and bare, the air-as a good heat conductor that is, we will produce, of course, an intense feeling of cold.
A good garment can allow us to generate an air chamber isolated from the outside.
Thus, if our body gets warm the air chamber, we get a sense
heat through thermal conductive properties of this element.
addition, the higher physical activity, the greater the blood flow and greater power consumption, which raises the temperature inside the body. But this heating system is a double edged sword. Here's why.
How the body loses heat?
The problem starts when, due to the high level of physical activity, the body activates its
cooling system, secreting sweat to lower body temperature and keep a constant temperature. At the end of the day, sweat-water-is also a great conductor.
In fact, there are four ways to suffer heat loss: Convection
:
cold air to penetrate and circulate inside of the garment
produce a displacement or release of heat to the outside. A waterproof jacket, zippers at the wrists, ankles and neck
belted at the waist cord, prevent the heat output abroad.
Driving:
In contact with cold surfaces, such as example to sit above the snow,
lose our heat through the tissue. Avoided thanks to the protections in the areas of contact
gloves, footwear and pants. Avoiding the garment gets wet,
also reduce this effect.
Evaporation:
At low temperatures, sweating is a serious problem. Water molecules
sweat seeping through the garments are retained by the tissue, making it a perfect heat conductor body to the outside (and cold inside). For this reason
, it is essential to keep the skin dry.
Radiation:
The body converts food into infrared radiation radiating from the skin in all directions. Hence the importance of materials able to retain this heat between the fibers to keep at the correct temperature.
If the body is affected by cold (and / or hypothermia), it triggers a natural reaction calorie savings to keep the temperature of vital organs (heart, liver, brain, etc.) to the detriment of the peripheral parts of the body (hands, feet, nose, ears, etc.).
Conclusion: Principles for warmth
the analysis of the heating system of our body, can be deduced the following principles
:
The body must generate heat. Therefore, the body must have sufficient energy to generate heat
. In this sense, the body must be properly hydrated.
is necessary to preserve, from the outset and continuously,
body temperature. The retention of body heat is obtained from the air chambers that are among the body
and abroad. Therefore, against more air chambers included in the shortest
more heat retention is achieved. Also, avoid the body loses heat
any part, in this sense, the head is lost
20% of our body heat.
Blood must flow throughout the body. Therefore, clothing should be avoided occur
excessive pressure on blood supply vessels (arteries) or return on
(veins), and causing the slowdown in the circulation of blood.
We must avoid the water (sweat, rain, snow, etc..) Is in contact with skin. Garrido
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