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NOTES OF SNOW. WHITE WEEK

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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Security tracks

Standards common to all skiers and snowboarders

1 ª. Respect other skiers or snowboarders.
We must never jeopardize the safety of others or with our behavior or to
our material.

2 ª. Speed.
not go like a motorcycle, the speed at which you go down will depend on our skill and
weather conditions.

3 rd. Direction.
If you fall, you must be careful with those who are walking the track.

4 th. Overtaking.
can do above, below, left or right, there is no strict rules when
overtake another skier or surfer, but you must take into account the distance
safety and not endanger the decline demás.Siempre
the fault is behind Arroyo.

5 th. Crossing a track or starting a descent.
When you get to the track or an area of \u200b\u200blearning, always look up and make sure that
not disturb the others.

6 ª. Parada.
Do not stop along the track or in areas of poor visibility, and if you fall, you
quickly throw you aside and allow to clear the center of the track to allow passage
other skiers or snowboarders.

7 th. Walk.
is forbidden to raise or lower the tracks on foot. In case you need it,
use the side of the track.

8 th. Signals.
All skiers and snowboarders should respect the signals are on the track.

9 ª. Accidents.
If an accident happens you always have to pay should pay the skis ayuda.Se
shaped blade for and alert other skiers.

10 th. Id.
If you are involved in a crash or you witness, you should always log in the service of
relief. Garrido

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3-LAYER SYSTEM

First Layer

The 1 st layer (underwear), aims to keep the skin dry by expelling the
sweat away from it and avoid being chilled (wet clothes Skin contact can let heat escape
twenty-five times faster than dry).
The choice of this first layer is crucial for optimal functioning
outerwear. As if it were a second skin
should match throughout the body, neck, wrists and ankles
, to trap warm air generated by our body avoiding
you move abroad. However, be careful not to squeeze in
excess and slow the flow of blood.
This type of garments are made with stretch fabrics and
no side seams. The fewer seams are flat with
greater comfort. If you make the mistake of using this type of clothing
conjunction with conventional cotton underwear, we will cancel the benefits of
these materials, since cotton will absorb all moisture and keep in contact with skin
. According
Light


thickness is the thinnest (Duofold ™ 375-SS, 360/361-PB, 370 BX, 700-LS-LD and The North Face ™
Aerobic), ideal for cold areas where it exercises intense physical activity and produces
a lot of sweat, helping to perspire and expel the sweat. Average thickness


(O-LS-LD Duofold ™ 51, 760-ZT, 761-LS/MU-LD/MU and The North Face ™ Alpine), ideal for cold
continuing operations increased thickness


issue is the thicker (820-Py Duofold ™ The North Face Expedition), used for activities
more static with minimal sweating. This is the type most calorific. Can be reached
used as replacement of a 2 nd 1 st layer on a thick layer of light.
According brand THE NORTH FACE ™

The main feature is the anatomical shape sleeves and legs, which give a unique adaptability and comfort
. AEROBIC WEIGHT
MICRONAMICS.
exclusive fabric The North Face ™. Polyester pique on one side and brushed on the other.
maximum moisture removal to the outside for fast drying (weight of 122 g / m).
MICRONAMICS ALPINE WEIGHT. Exclusive fabric
The North Face ™. Polyester pique on one side and brushed on the other. The
moisture is transported to the outside for quick drying maintaining good heat retention
ratio (weight of 186 g / m). ELASTIC 100M

POLARTEC ® fleece fabric manufactured by Malden. Very good heat retention / wet weight even
. Dries fast, resists pilling, is hypoallergenic and odorless.
DUOFOLD ™
This manufacturer to make their garments Thermastat, Thermax and Coolmax.
THERMASTAT: One of the most advanced fibers for use in cold climates. Hot
23%, 30% more breathable, with 40% more power to expel the water the
polypropylene. Does not absorb odors. THERMAX
: The first version of Thermastat. Its features are a little lower. COOLMAX
: fiber composed of 4 channels with microscopic grooves.
carry off the body sweat, evaporating moisture. Does not absorb odors. Ideal for use in warm climates
. Tissue being less transparent than other brands grid, expel the moisture
equally or higher.

S econd layer
As we have seen, the function of the fibers of the fleece,
as a second layer, is to retain the heat generated by the body
isolating the cold outside.
tissue becomes Polyester fleece by applying a treatment of partial tear of the tissue
using small gears: the threads
open in micro-filaments in a vertical position giving
spongy and soft. This will get moisture resistance, fast drying
calorific value twice that offered by the wool,
creating a warm and dry insulation around the body, the
moisture away perspiration from the skin. No rot and just absorbs odors. Its main drawback
is that the wind gets pass it, causing the
problem of heat loss. To avoid this, have created new materials such as rolled
the Windstopper or Windbloc.
Models with reinforcements in the crucial areas specifically designed for
climbing or carrying heavy backpacks.
As the first layer, the feature to be considered for the election of the first
layer is its thickness. There are three types of weights: Light


Average thickness Thickness
expedition garments made with windproof membrane, such as the Windstopper ® or
the Windbloc ®, are considered of medium thickness. It is not normal to find them in thick
issue, since in these cases is combined with a fleece outer garment
3 rd layer perform the function of short wind.

Third layer

Recall that the third layer should protect against wind and water
while allowing breathability.
A careful preparation of the third layer
should allow optimal mobility, protecting outsiders even to stay in position or posture
trickier. For example, let the best hoods
Helmets hold under them, have
Bourkes and follow the movement of the head to provide a total view
even looking back.
In the third layer must take into account the following factors:
1. The number of layers is that this third layer.
2. Impermeability.
3. Breathability.



Depending on the fabrics used for laminating or induced
features breathable, waterproof and will vary significantly. Thus, according to different
trademarks, we can find various materials.

Other systems

The down

We have seen that the retention of body heat can be obtained from the air chambers that are among the body
and abroad. On this basis, against more air chambers
appear in less space, more heat retention is achieved. The pen of its merits, is the fiber
more air gets cameras, as well as expand and compress the fiber
better. Moreover, it occupies less space when compressed within a sheath
and equal benefits, weighs less.
The drawback is that it is more delicate than synthetics and there
to avoid getting wet, which is why their linings are usually of nylon, not cotton because the cotton absorbs moisture
. Nor can it be washed often as in the case of fibers and
should be done with special products. Otherwise, the pen cakes and holes are created within the chambers of the garment
.
There are different qualities of pen and classification from highest to lowest heat retention is:
duvet, the down and crushed the boom. The duvet will be with us to notice the least touch of the cane,
therefore is that we get more heat retention. Garrido