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How to keep high school athletes safe from heat illness in a brutally hot summer

August 6, 2022
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How to keep teen athletes safe from heat illness as sports practice begins amid a brutally hot summer
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Staying hydrated is part of staying safe during summer workouts. Shawn Patrick Ouellette/Portland Portland Press Herald via Getty Images

As temperatures rise, heat illnesses are becoming an increasing risk for athletes, particularly in the first few weeks of practice. We asked Susan Yeargin, a co-author of the National Athletic Trainers Association’s position statement on heat illness, to explain the risks and what coaches and players need to remember to keep kids safe.

Table of Contents

  • Why are athletes particularly vulnerable to heat during the first few weeks of training?
  • At what point do temperatures start getting dangerous for young athletes?
  • How can you tell when someone is suffering from heat illness?
  • What do athletic trainers recommend for keeping athletes safe in the heat, particularly in those first weeks?

Why are athletes particularly vulnerable to heat during the first few weeks of training?

When an athlete of any age begins to exercise or train for a sport in hot conditions, the body needs time to adapt. In a natural outdoor environment, this is called heat acclimatization.

In the first three days of heat exposure, the body hasn’t started to adapt, which is why those are the riskiest days for heat illness. Most acclimatization happens by the 10th day, but it takes about two weeks for the body to reach its peak heat acclimatization.

High school football players in shorts and minimal pads at a summer practice.
There are good reasons that players start the first few weeks of preseason practice slowly.
Ben Hasty/MediaNews Group/Reading Eagle via Getty Images

The most important change within the body is plasma volume expansion, giving the body more blood to help dissipate heat and supply exercising muscles. In short, it allows the cardiovascular system to work more efficiently.

The rate of sweating also increases, allowing more heat to dissipate from the body. The body increases its retention of salt, which is good because it allows for better electrolyte balance within the body to maintain hydration and keep muscles working optimally. The heart rate decreases, so there is less strain on the cardiovascular system. And the core body temperature decreases, representing a lower risk for exertional heat stroke.

But even with all of these adaptations, the body isn’t fully protected from heat illness, which is why other prevention strategies are needed.

Also, just because athletes have been training over the summer doesn’t mean they are fully adapted to heat under the conditions that a sport season imposes. The sports season brings new exercise intensity, often higher heat than earlier in the summer, and heavier equipment, like pads and helmets, and an increased pressure to perform.

At what point do temperatures start getting dangerous for young athletes?

That varies across the country. Athletes who live in milder climates should not be practicing in environmental conditions over 86.2 degrees Fahrenheit (30.1 degrees Celsius), based on wet bulb globe temperature. For those in traditionally hotter climates, like Texas, the recommended cutoff temperature for canceling practice is 92 F (32.2 C).

The risk is about more than the temperature – it’s also about humidity, sun and wind. Humidity hinders sweat evaporation, the body’s primary heat dissipation mechanism. So when humidity is high, no matter the air temperature, that creates a heat safety concern.

A young man with a bag of ice on his head.
An athlete cools off in California during an August practice.
Terry Pierson/MediaNews Group/The Press-Enterprise via Getty Images

Athletic trainers often use wet bulb globe temperature – which takes all four of those variables into account – to determine when teams should shorten or cancel practice and how often rest and cooling breaks should be required. It’s a better gauge of risk than the heat index, which uses only air temperature and humidity.

Anyone can check their area’s projected wet bulb globe temperature using a National Weather Service website.

How can you tell when someone is suffering from heat illness?

There are several conditions that fall within the realm of “heat illnesses,” but these are the primary ones:

  • Heat cramps, also referred to as exercise-associated muscle cramps, are caused either by dehydration and electrolyte losses or tired muscle groups. They’re easy to spot when a muscle group tightens and knots. Heat cramps can typically be treated with rest, stretching and hydration with electrolytes. If someone is complaining of cramps but the muscles are not knotted and tight to the touch, then that person could be experiencing an emergency condition related to sickle cell trait called exertional sickling.

  • Heat exhaustion can occur when a person is dehydrated and exercising in warm conditions. Eventually, the body is unable send enough blood to both the working muscles and the skin for heat dissipation. It will prioritize the heat dissipation, and the person either collapses or can’t continue exercising. This should be treated by placing the person in shade or air conditioning, giving them something to drink, and cooling them with fans or cold towels. If they don’t respond quickly, they may need medical attention.

  • Exertional heat stroke is a medical emergency in which a person’s body temperature is over 105 F (40.6 C). Unfortunately, traditional temperature devices like oral and forehead thermometers don’t measure body temperature accurately in these situations. If a person has been exercising in warm conditions and their personality changes, they start acting weird or different or become confused, you should suspect exertional heat stroke. First responders should place the heat stroke victim in a cold water immersion tub up to their shoulders and make the water as cold as possible with ice. If that’s not available, any kind of water immersion like a baby pool, creek, tarp filled with water, or dousing should be used. EMS should be called immediately.

An important clue in all of these heat illnesses is that the person is almost always sweating. It is a myth that the person will stop sweating; this rarely happens.

What do athletic trainers recommend for keeping athletes safe in the heat, particularly in those first weeks?

Teams should follow heat acclimatization guidance to gradually increase the length of training sessions and the intensity of workouts. For example, an expert group that reviewed research on youth sports recommended always keeping training or practice sessions under two hours and only once a day in the first week. Conditioning, such as repetitive running and timed drills, should be held in an air-conditioned area or not integrated for the first two weeks.

In addition, teams should pay attention to wet bulb globe temperature tables for their part of the country and avoid exercising in the hottest part of the day, generally 10 a.m. to 6 p.m.

The National Athletic Trainers Association also recommends: using “weight charts” to help players understand how much they need to drink to stay hydrated; having on-site athletic trainers with treatment resources, such as cold-water tubs; encouraging good sleep and nutrition; and providing a safe work-to-rest ratio during conditioning and practice sessions. Breaks should be in the shade, ideally with cooling devices such as fans, misters and cold towels. If a hard or intense drill is completed, players should have an equally long break.

A buddy system is also beneficial. With a buddy, someone is more likely to notice when an athlete isn’t feeling well or is starting to act out of character and needs to be stopped for evaluation.

The Conversation

Susan Yeargin is affiliated with Korey Stringer Institute Medical and Science Advisory Board and the NATA Foundation Research and Pronouncements Committees.

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