How hot is too hot?
Unfortunately, there is no "magic number" to
answer this question. There are numerous factors that decide this, including
physical condition and genetics. And it doesn't have to even be hot outside,
some people just react differently to different environments.
In fact, a study in the Journal of Medicine and Science in
Sports and Exercise discusses a "well-trained male runner in his late
30s" who collapsed just a mere ten meters short of the finish line of a
marathon from heat stroke. His body was at a core temperature of 105.3 degrees
Fahrenheit half an hour after he collapsed. And the real kicker here - the
temperature outside?A high of 49 degrees. Fahrenheit. No, not Celsius,
Fahrenheit. And remember, this was a seasoned athlete here, not some out of shape
weekend 2-mile runner.
The key is that you need to find what works for you. If you
are running and begin to feel weak or dizzy, an unusually rapid heartbeat or
get a headache - you may be experiencing the warning signs of heat exhaustion,
the precursor to heat stroke. Your body will give you plenty of advanced
warning of heat-related illness, making it easy to prevent if you just listen
to the messages your body sends you. Ignoring the early warning signs can have
some disastrous results, possibly sending you to the emergency room - or worse.
If you are in a new area which is warmer than what you are
accustomed to, it may take your body up to a week to acclimate itself to your
new surroundings. You should avoid strenuous workouts in the heat until that
week has passed.
Moral of the story? This can happen to anyone, even you.
The Sweaty Six
There are six main heat-related illnesses that you will need
to concern yourself with. All are serious to some degree, however one is
potentially fatal.
#1: Heat Exhaustion
Heat exhaustion is thought be the onset of other heat
related illnesses. It typically begins when the core body temperature is in the
range of 98.6 degrees Fahrenheit to 104 degrees Fahrenheit. Some of the
symptoms of heat exhaustion are heavy sweating, nausea, dizziness, fainting,
weakness, headache, vomiting or cold and clammy skin.
To treat heat exhaustion, a mild case requires little more
than getting into a cool place, resting and hydrating with sodium-containing
liquids such as sports drinks. In more severe cases, fluids may be given
intravenously and ice packs may be used for rapid cool down of the body.
#2: Heat Cramps
Heat cramps are one of the first warning signs that your
body is in danger of overheating. It is thought that profuse sweating combined
with a lack of water and electrolyte intake lead to muscle spasms that make it
very uncomfortable to continue exercising. It should be noted that getting heat
cramps does not predispose you for any further heat-related illnesses.
Treatment for heat cramps will include stretching of the
muscles, massage and icing the muscles down. You should also make sure to
hydrate yourself, as well as getting some sodium into your system .
#3: Heat Edema
Heat edema is a mild heat illness that occurs when the body
has not yet become acclimated to a new, warmer surrounding. There will be mild
swelling and redness in the extremities as blood pools there in an attempt to
cool off the body. This is more common in older adults who are getting
acclimated to tropical climates.
Heat edema is treated by rest and elevation of the limbs.
You can also use compression stockings in extreme cases, but it will usually
take care of itself in 7-14 days, or when the athlete returns to their normal
climate.
#4: Heat Rash
Miliariarubra, commonly known as "heat rash" is an
itchy, and sometime painful set of small red bumps that appear on the skin when
you are in the heat too long. You will most commonly find this in highly sweaty
areas such as the waist, trunk or groin. It is caused by obstruction of the
sweat ducts. Excessive scratching can cause Staphylococcus infection as well.
To treat heat rash, cooling of the area is the best thing
you can do, sometimes changing the clothes you wear when running will help. If
the rash does not go away on its own in a few days, you may get a cream from
the doctor such as an antibacterial/steroid combination that will eliminate it
quickly.
#5: Heat Syncope
Another mild heat illness, heat syncope is caused again by
pooling of the blood in the extremities, combined with a rapid change in body
position such as standing up after riding a bicycle in the hot weather.
The most common remedy for heat syncope is to put the
patient into a supine position (laying down, face up) in a cool spot. Elevation
of the legs may help, but is often not necessary. You also want to make sure
you are taking in liquids, as dehydration is probably one of the things that
caused the illness in the first place.
#6: Heat Stroke
There are two types of heat stroke, classic and exertional.
Between the two of them, they are responsible for around 400 deaths per year.
The first type, classic, is where the environment takes on a
larger role, such as a particularly bad summer heat wave. These cases are
common among the elderly who may not have air conditioning in their homes. This
is often a result of the body not having time to get acclimated to the climate.
The second type, exertional is the one that runners really
need to be careful of. This is where the heat is generated by the athletes body
from an aggressive workout. Exertional heat stroke is the third leading cause
of death among athletes, with football players seeing the largest number of
individual deaths each year.
In both cases, the symptoms will be similar to heat
exhaustion, only more pronounced, with the added possibility of collapse,
seizures or unconsciousness. The core body temperature will have rise to over
104 degrees Fahrenheit. At this point the person will definitely require
medical attention, as an aggressive cooling plan needs to be put into place,
the body must be returned to normal temperatures between 30-60 minutes from the
time of the initial onset.
Who Is At The Greatest Risk?
The two easiest groups to pick out are the young and the
elderly (under age 15, over age 75). Their bodies are far more susceptible to
heat than the rest. People who have a history of heat-related illness are not
only at a greater risk of developing heat-related illnesses in the future, but
also at greater risk for further complications down the road.
People with medical conditions such as eczema or psoriasis
are at higher risk, as are those who are overweight and/or in poor
cardiovascular health. Even something as simple as not getting a good night's
sleep can increase your risk considerably.
There are also several external factors that can contribute
to heat illness susceptibility. One of which is taking certain medications. The
long list includes allergy medicines, cough and cold medicines, blood pressure
and heart medication, products containing pseudo ephedrine, diet pills,
medication for irritable bladder and bowel syndromes, laxatives,
benzodiazepines like Klonopin, Valium or Librium, seizure medicines, thyroid
pills and diuretics.
Best Ways To Stay Safe
There are a few simple ways you can be sure you are safe
when exercising in the heat. These are really all common sense, but I will
mention them anyway.
Early To Bed, Early To Rise...
It's a simple fact - in the middle of the summer, mid-day is
just TOO hot to be out running. You would need to carry around a gallon jug of
water to replace what you are going to lose sweating for an hour in 90 degree
heat. So you have two options - early morning, or late night. I know it can be
hard to wake up that early - but you will get SO much more accomplished in your
day when you get up early, and start out with some breakfast and a nice bit of
exercise.
Keeping Hydrated
Your body can lose an incredible amount of water in a short
amount of time exercising in the heat. Make sure you drink plenty of water
before you even leave the house, and it is a must to have a supply of water
with you. Add a tablespoon of sugar and a quarter teaspoon of salt to your
bottle of water and save the buck on the sports drink (and spare your body from
a few chemicals).
Take It All Off
It is important to dress appropriately when the temperatures
start to climb. Light, airy fabrics should be worn - try to avoid synthetic
based materials as they will just trap the heat next to your body. The moisture
wicking fabrics are much better suited to summer exercise. When it's steamy,
shorts and a tank top are really what you should be wearing.
Frozen Towels
You just take a small (hand-sized) towel, get it wet - then
throw it in the freezer overnight. When you leave for your morning run, you
grab it and drape it around your neck. Having a cold towel on the back of your
neck makes your whole body feel cooler, and it will stay cold for quite a while
in the heat. Plus you get the added protection from sunburn on your neck.
Post-Run Cleanup
It is always a good idea to bring a few clean towels and a
change of clothes. with you for when you are finished with your exercise
routine. Wiping off that oily film of sweat will help open your pores and let
your body cool down easier when you are finished, as will having some nice dry
clothes to wear. This is especially helpful for preventing heat rash.
Conclusion
Heat-related injuries and illnesses are easily preventable,
all that is required is a little care and common sense. Make sure you stay
hydrated - bring water or a sports drink with you every time, even if you are
only going to be running 20 minutes. Be mindful of the temperature forecast -
and remember that it will feel almost twenty degrees hotter than it really is
once your heart starts pumping.
If you start to exhibit signs of heat related illness, stop
immediately, get into the shade or air conditioning, and drink lots of fluids.
If you do not recover within a reasonable amount of time you may need to seek
medical attention as heat stroke can be life-threatening.
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