Name: 【TED-Ed】What happens when you get heat stroke? - Douglas J. Casa
Uploaded: 2014-12-26T03:10:59.000Z
Duration: 3 min 54 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

ran the championship 10,000 meter track race at the Empire State Games.

Adverbs of manner

Suddenly, with just 200 meters to go, he collapsed,

got back up and then collapsed again on the final straightaway,

with his body temperature  at dangerous levels.

He had suffered an exertional heat stroke.

Fortunately, with immediate and proper treatment,

he survived the potentially fatal episode

and has since helped save 167 people in similar circumstances.

exertional heat stroke, or sunstroke,  has long been a serious concern.

And unlike classical heat stroke,  which affects vulnerable people

such as infants and the elderly  during heat waves,

exertional heat stroke is caused by  intense exercise in the heat,

and is one of the top three killers of athletes and soldiers in training.

When you exercise,  nearly 80% of the energy you use

In normal circumstances,  this is what's known as

And your body can dissipate the heat as quickly as it's generated

through cooling methods  like the evaporation of sweat.

due to overexertion or  high temperatures in humidity,

which raises your core temperature  beyond normal levels.

This causes the proteins and  cell membranes to denature,

creating cells that no longer  function properly

If these leaky cells  proliferate through the body,

Including liver damage,  blood clot formation in the kidneys,

damage to the gastrointestinal tract  and even the failure of vital organs.

So how do you diagnose  an exertional heat stroke?

The main criterion is a core body temperature  greater than 40 degrees Celsius

such as increased heart rate,  low blood pressure and rapid breathing

or signs of central nervous system disfunction

such as confused behavior,  aggression or loss of consciousness.

The most feasible and accurate way  to assess core body temperature

as other common temperature-taking methods are not accurate in these circumstances.

the most important thing to remember is cool first, transport second.

Because the human body can withstand  a core temperature above 40 degrees Celsius

for about 30 minutes before cell damage sets in,

it's essential to initiate rapid cooling on site

in order to lower it as quickly as possible.

After any athletic or protective gear  has been removed from the victim,

place them in an ice water tub  while stirring the water

dousing in ice water and applying  wet towels over the entire body can help.

But before you start anything,  emergency services should be called.

As you wait, it's important  to keep the victim calm

while cooling as much  surface area as possible

If medical staff are available on site, cooling should continue

until a core temperature of 38.9 degrees Celsius is reached.

but it can also take life away if we're not careful,

As Dr. JJ Levick wrote of exertional heat stroke in 1859,

"It strikes down its victim  with his full armor on.

Youth, health and strength oppose no obstacle to its power."

But although this condition is one of the  top three leading causes of death in sports,

it has been 100% survivable with proper care.

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【TED-Ed】What happens when you get heat stroke? - Douglas J. Casa

stress

state

accurate

exercise