Stress thermique en course automobile

Hello, today we are at Stand 21, the pioneering manufacturer of custom-made equipment
for the protection of racing car drivers, based for the past 50 years in Dijon to discuss driving and heat
while wearing a protective racing suit What happens to your body while driving? Why does this affect
the constant research for improved racing suits? Driving is a physical exercise
stressing the body This effort increases your muscular work, effectively raising your body temperature If generated heat cannot escape the body, it becomes dangerous The body thermal balance is vital Elevated body temperature is very dangerous and can affect performance Especially since you are not unaware of it: the heat released
in the passenger compartment of the car, regardless if emanating from the engine
or from radiation related to the car’s glazed surfaces does not play in your favor It is therefore essential to get rid of that accumulated heat Otherwise, it can lead to dehydration, impaired physical performance and increased reaction time Dehydration gradually sets in while driving It has been shown through research
that in the short and long term it leads to a decrease in car control and in perception and ability to make the right decision quickly Researchers have observed a decrease in acuity and not only is reaction time increased but also performed judgmental decisions
are less effective and executed with less precision As you will gather, storing a large amount of heat
leads to a decrease in performance which in the long term can reduce the time
of possible total physical effort and put your life in danger It should be noted
that the addition of carbon monoxide released by cars accelerates hyperthermia
and increases the perspiration rate So, how does the body evacuate this heat? By dilating the blood vessels closer to the skin
and transferring warmer blood there It follows the well-known phenomenon of perspiring It is essential for this perspiration,
to be effective, that its evaporation be possible Factually, evaporation accounts for nearly 80% of heat loss It is important to know
that only a change of state of the perspiration allows a heat loss, and not its production, nor the water drops that run on your skin Faced with this dilation of the blood vessels
and the risk of relative hypovolemia, the heart rate increases If heat is not properly or sufficiently evacuated, the heart will now favor
this elevated cardiac output, even risking a hyperthermia
and this is where the danger lays Not only are we having this problem, but you will understand
that you are not driving naked Since evaporation depends on the amount of skin surface
in contact with its surrounding environment, air draft and humidity of the external environment, the underclothing and racing suit
must be able to allow the sweat to evaporate This is where we answer the main question,
and this will be in the next video

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