A kid practicing in heat gets a sudden cramp in the calf or hamstring. It locks tight. The kid drops to the ground in pain. Most parents and coaches default to “drink water.” That is part of the answer but not the whole answer. Heat cramps respond to a specific protocol that includes sodium replacement, not just fluid.
This piece is the framework.
What heat cramps are.
Heat cramps are exercise-associated muscle cramps that occur during or after exercise in heat. The published mechanism, per National Athletic Trainers’ Association (NATA) and Korey Stringer Institute (KSI):
Sweating produces water and sodium loss.
When sodium loss exceeds intake, blood sodium drops.
Muscle excitability increases at lower sodium levels.
Muscle fibers spasm.
Heat cramps are typically painful, involuntary, and affect specific muscle groups (calves, hamstrings, quads, abdominal muscles most commonly).
Heat cramps are distinct from heat exhaustion. The kid with isolated cramps but no other heat-illness symptoms is in early heat-related stress, not in heat exhaustion. Different protocol.
The protocol.
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Stop activity. Get the kid to shade or air-conditioning.
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Gentle stretching of the affected muscle. Hold the stretch for 15 to 30 seconds. Massage the muscle gently. Aggressive stretching can worsen pain; gentle works.
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Fluid AND sodium. This is the part most adults get wrong. Plain water alone often does not resolve heat cramps because the underlying issue is sodium loss, not just fluid loss.
The published protocol: a sports drink with sodium content (typically 100 to 200 milligrams of sodium per 8 ounces, like Gatorade, Powerade, Liquid IV, LMNT). Drink 16 to 24 ounces over 10 to 20 minutes.
Alternative: pickle juice (1 to 2 ounces). The acetic acid and sodium content addresses heat cramps in some kids surprisingly quickly. Some athletic trainers carry it.
Alternative: salt tablets or electrolyte tabs dissolved in water. Effective but requires availability.
What does not work as well: plain water. Coconut water (low sodium relative to typical sports drinks). Milk (slow absorption).
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Rest for 30 to 60 minutes after symptoms resolve. The kid does not return immediately. The underlying sodium balance takes time to restore.
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Monitor for progression to heat exhaustion or heatstroke. The kid with new symptoms (confusion, severe headache, vomiting, mental status changes) is moving toward heat exhaustion or heatstroke. Different protocol then.
When to call medical attention.
Cramps that do not resolve within 30 minutes despite proper protocol.
Cramps that recur immediately after activity resumption.
Cramps in a kid with concerning underlying conditions (sickle cell trait, electrolyte imbalances, kidney issues).
Cramps with any signs of progression: nausea, vomiting, dizziness, confusion, severely elevated body temperature.
For non-emergency cramps that respond to protocol, pediatrician follow-up is appropriate if cramps are recurring across practices or seasons.
The prevention.
Pre-practice hydration. 16 to 24 ounces of fluid in the 2 hours before practice.
Sports drinks during long or intense heat practice, not just water. The American Academy of Pediatrics (AAP) supports sports drinks for practices over 60 to 90 minutes in significant heat. Plain water is fine for shorter sessions.
Sodium intake at meals. Kids on low-sodium diets are at higher risk for heat cramps during heat-acclimatization periods.
Heat acclimatization. NATA’s Preseason Heat-Acclimatization Guidelines reduce all heat-related issues including cramps when followed.
For kids who cramp routinely despite adequate hydration, evaluation for underlying conditions (sickle cell trait, particularly in African-American athletes; thyroid function; electrolyte imbalances) is reasonable.
The “muscle cramp” that is not heat-related.
Some cramps in young athletes are not heat-related:
Exercise-associated muscle cramps in cool conditions. Often related to overload, technique, or muscle fatigue rather than electrolyte loss. Different protocol; gentle stretching, rest, technique review.
Stress cramps. Cramping from emotional or performance anxiety. Pre-game cramps without preceding exertion are sometimes anxiety-related.
Cramps from medications. Some medications produce muscle cramping as a side effect. Worth reviewing with the pediatrician if cramps are unusual.
Cramps from underlying conditions. Persistent unexplained cramping warrants evaluation.
For most cramps in obvious heat-and-exertion contexts, the protocol above resolves the situation. For cramps in unusual circumstances, the cause matters.
The sickle cell trait consideration.
Athletes with sickle cell trait (more common in African-American and African-descent populations) are at elevated risk for serious exertional issues including cramping that can progress to rhabdomyolysis or sudden cardiac events.
NCAA and many high school programs require sickle cell trait screening for athletes. The published recommendations for athletes with sickle cell trait include:
Gradual acclimatization.
Avoidance of all-out exertion without rest periods.
Hydration.
Heat avoidance when possible.
Prompt response to cramping or unusual symptoms.
For families with kids who have sickle cell trait, the athletic-trainer or sports-medicine consultation about exertion guidelines matters.
For coaches.
Recognize cramps and respond with the sodium-plus-fluid protocol, not just water.
Carry sports drinks or electrolyte products at practices in heat.
Document recurring cramps in specific athletes; consult the team’s medical personnel.
Modify practice intensity for the kid with active cramps. Do not push.
For parents.
For a kid who cramps routinely, sports-medicine consultation about underlying causes.
Adequate dietary sodium for kids practicing heavily in heat. Most kids on standard Western diets have adequate sodium; kids on heart-healthy or low-sodium diets may be at higher risk.
Communication with coaches about the kid’s cramping pattern.
The honest read. Heat cramps are recoverable with the right protocol. The “drink more water” framing addresses only half the problem; sodium is the other half. The kid who gets the fluid-and-sodium combination within 10 to 20 minutes typically recovers fully and can finish the day at reduced intensity (after the 30 to 60 minute rest). The kid who only gets water often continues to cramp.
For programs and families, the sports drink with sodium content is the practical answer. Knowing why protects the kid.