Every summer, athletes head back to practices, conditioning sessions, camps, and tournaments, often during the hottest days of the year. While warm-weather exercise is part of many sports, exertional heat illness is almost entirely preventable with proper planning, hydration, and recognition of early warning signs.
At ActiveKidMD, we want parents, coaches, and athletes to understand how heat illness develops, how to recognize it early, and what steps can help keep young athletes safe.
Why Heat Illness Matters
Heat illness occurs when the body generates more heat than it can effectively remove. During exercise, working muscles produce significant amounts of heat. When environmental temperatures and humidity are high, or when an athlete is not acclimated to the heat, the body’s cooling system can become overwhelmed.
The good news? Research has shown that children and adolescents tolerate exercise in the heat similarly to adults when appropriate precautions are taken. This means prevention strategies, rather than age alone, are the key to reducing risk.
The Spectrum of Heat Illness
Heat illness ranges from mild muscle cramps to a life-threatening medical emergency.
Heat Cramps
Heat cramps are often the earliest form of heat illness.
Signs include:
- Sudden, painful muscle cramps
- Tight, hard muscles
- Usually affects a specific muscle group
- Pain can be intense enough to stop activity immediately
Treatment includes stopping activity, moving to a cooler location, drinking fluids, and allowing the affected muscles to recover. The athlete should not immediately return to full activity if cramping continues or movement remains painful.
Heat Exhaustion
Heat exhaustion develops when the body struggles to maintain adequate circulation and temperature regulation during exercise.
Common symptoms include:
- Weakness
- Dizziness
- Headache
- Nausea
- Fainting or feeling like you may faint
- Excessive fatigue
- Heavy sweating
- Cool or clammy skin
Unlike heat stroke, body temperature is typically below 104°F (40°C), and mental status remains normal.
An athlete with suspected heat exhaustion should stop activity immediately, move to a cool or shaded environment, remove unnecessary clothing or equipment, begin cooling measures, and replace fluids under appropriate supervision.
Exertional Heat Stroke: A Medical Emergency
Exertional Heat Stroke: A Medical EmergencyExertional heat stroke is the most serious form of heat illness. It is defined by:
- Core body temperature above 104°F (40°C)
- Changes in brain function, including confusion, disorientation, unusual behavior, seizures, or loss of consciousness
Heat stroke can rapidly lead to organ damage if treatment is delayed.
One of the most important messages for coaches and parents is this:
An athlete who develops confusion or altered behavior during or immediately after exercise in the heat should be treated as having heat stroke until proven otherwise.
The Importance of Rapid Cooling
When exertional heat stroke is suspected:
- Activate emergency medical services.
- Begin rapid cooling immediately.
- Remove excess clothing and protective equipment.
- When available and supervised by trained personnel, cold-water immersion is the preferred cooling method.
- Cooling should begin before transportation whenever possible.
Accurate core temperature is best measured using a rectal thermometer by trained medical personnel, as oral, ear, forehead, and underarm thermometers are not reliable during exertional heat illness.
Early recognition and immediate cooling dramatically improve outcomes.
Who Is at Higher Risk?
Several factors increase the likelihood of heat illness, including:
- Poor physical conditioning
- Lack of heat acclimatization
- Inadequate hydration
- Limited access to water
- High temperatures and humidity
- Multiple practices or competitions in a short period
- Heavy uniforms or protective equipment
- Dark clothing that reduces heat loss from the body
- Limited access to shade and cooling areas
- Lack of an emergency action plan
Many of these risk factors can be reduced through preparation and appropriate practice policies.
Also see: Exercise When Sick: How to Make the Best Call
Heat Acclimatization Saves Lives
The body becomes more efficient at handling heat when exposure and exercise intensity are increased gradually.
A heat-acclimatization period of approximately 10 to 14 days can help athletes:
- Sweat earlier and more efficiently
- Maintain lower body temperatures
- Improve cardiovascular performance in hot environments
- Reduce the risk of heat illness
During this period, practices should gradually increase in duration and intensity. The use of heavy protective equipment should also be introduced progressively rather than all at once.
This is why preseason heat-acclimatization guidelines have become standard recommendations in high school athletics.
Also see: Back to School – Back to Sports
Hydration: Water First
Hydration: Water FirstProper hydration is one of the simplest and most effective ways to reduce the risk of heat illness.
Young athletes should:
- Begin practices and competitions well hydrated.
- Drink water regularly throughout activity.
- Avoid waiting until they feel thirsty to drink.
- Have unrestricted access to water.
- Take scheduled hydration breaks throughout practices.
- Continue replacing fluids after activity ends.
Sports drinks may have a role during vigorous exercise lasting longer than one hour, when replacing carbohydrates and electrolytes becomes more important. For most youth sports participation, however, water remains the preferred source of hydration.
Also see: Best Sports Drink – What is the Best Choice?
Monitoring for Dehydration
Monitoring for DehydrationSome athletes arrive at practice already dehydrated, particularly during busy tournament schedules or multiple-practice days.
Possible signs of dehydration include:
- Dark-colored urine
- Dry mouth
- Headache
- Unusual fatigue
- Dizziness
- Reduced athletic performance
Adjusting Activity for Environmental Conditions
Heat safety requires more than checking the air temperature. Humidity, direct sunlight, wind, protective equipment, and the intensity of activity can all affect heat stress.
Many organizations recommend using the Wet Bulb Globe Temperature, or WBGT, to guide practice modifications. When WBGT is not available, the heat index may offer useful information.
On-site certified athletic trainers can be valuable resources in addressing risk and making key modifications to reduce risk of heat illness.
As heat risk increases, coaches should progressively:
- Increase hydration opportunities
- Extend rest breaks
- Reduce practice intensity
- Remove unnecessary equipment
- Shorten outdoor sessions
- Schedule practices during cooler parts of the day
- Move activities indoors when possible
- Cancel or postpone outdoor activity when conditions become unsafe
Having the authority to modify or cancel practice based on environmental conditions is an essential part of athlete safety.
Every Team Needs an Emergency Action Plan
Preparation saves lives. Every school, sports league, camp, and training program should have:
- A written emergency action plan
- Personnel trained to recognize heat illness, including an on-site certified athletic trainer
- Access to cooling equipment
- Clearly assigned responsibilities
- Clear communication procedures
- Regular rehearsal of emergency protocols
The best emergency plan is one that everyone already knows before an emergency occurs.
When Should Parents Seek Immediate Medical Care?
Seek emergency medical attention immediately if an athlete develops:
- Confusion or unusual behavior
- Difficulty staying awake
- Collapse during exercise
- Seizure
- Loss of consciousness
- Persistent vomiting
- Difficulty walking or coordinating movements
- Symptoms that do not rapidly improve after stopping activity and beginning cooling
When exertional heat stroke is suspected, do not delay cooling while waiting for emergency personnel to arrive.
Safe Return to Play
An athlete should not return to activity simply because initial symptoms have improved.
After mild heat cramps, the athlete may be able to return once the cramping has fully resolved, hydration has been restored, and normal movement is comfortable. The athlete should be monitored closely for returning symptoms.
An athlete who experiences heat exhaustion should not return to activity on the same day. Medical evaluation may be appropriate, particularly when symptoms are severe, prolonged, or accompanied by fainting or vomiting.
Return to play after exertional heat stroke requires medical supervision. The athlete should be fully recovered, have normal laboratory results when indicated, and receive clearance from a qualified healthcare professional. Return should occur gradually, beginning with light activity in a controlled environment before progressing to more intense exercise and heat exposure (see also, Return to Sport – Plan to Turn Injury Tears into Comeback Cheers).
The return-to-play plan should be individualized based on the severity of the illness, the athlete’s health, and the demands of the sport.
The Bottom Line
The Bottom LineExertional heat illness is one of the most preventable medical emergencies in youth sports.
By emphasizing gradual heat acclimatization, proper hydration, environmental monitoring, scheduled rest breaks, and rapid recognition of warning signs, parents, coaches, schools, and healthcare providers can dramatically reduce the risk of serious heat-related illness.
Parents, coaches, schools, athletic trainers, and healthcare providers all play an important role in protecting young athletes.
Our goal is simple: keep every young athlete healthy, safe, and enjoying the sports they love.
Is Your Athlete Ready for the Season?
A preseason physical is an opportunity to review your child’s medical history, previous heat-related symptoms, hydration needs, medications, conditioning level, and any health concerns that could affect safe participation.
Our team can help develop an individualized plan for safe participation, heat acclimatization, hydration, injury prevention, and return to play.
Contact ActiveKidMD today to schedule an appointment and help your young athlete enter the season prepared, confident, and ready to compete safely.
