Heat-related illness is one of the most serious, and most preventable, risks in student athletics. NFMSS requires every member program to understand this risk, prepare for it deliberately, and respond to it without hesitation.

Why This Matters

Every year, student athletes are seriously injured, and in rare cases die, from heat-related illness during practice or competition. The physiology is not complicated: the body produces enormous amounts of heat during physical activity, and if that heat cannot be released fast enough, core body temperature rises to dangerous levels. Nearly every serious case is preventable through proper preparation, hydration, and recognition. There is no excuse for a middle school athlete suffering a heat emergency that appropriate planning would have caught.

Heat illness does not affect every athlete equally. Younger athletes regulate body heat less efficiently than older athletes and adults, which makes middle school student-athletes a genuinely higher-risk population, not a smaller version of a high school or adult concern.

Recognizing Heat Illness

Coaches, athletic staff, and parents should immediately remove an athlete from activity and seek evaluation if the athlete shows any of the following:

  • Heavy sweating that suddenly stops, or an unusual absence of sweating altogether
  • Cool, pale, or clammy skin, or skin that becomes hot, red, and dry
  • Muscle cramping, especially in the legs or abdomen
  • Dizziness, lightheadedness, confusion, or slurred speech
  • Headache
  • Nausea or vomiting
  • Rapid, weak pulse or rapid, shallow breathing
  • Fainting or loss of consciousness
  • Combativeness, disorientation, or behavior that seems “not right” for that athlete

Heat stroke, the most severe form of heat illness, is a life-threatening medical emergency. Any athlete who is confused, unresponsive, or has lost consciousness in a hot environment should be treated as a heat stroke emergency until proven otherwise. Cooling should begin immediately, and emergency services should be contacted without delay.

Hydration Standards

Proper hydration is one of the simplest and most effective tools available to prevent heat illness, and every NFMSS program should treat it as a requirement, not a suggestion.

  • Water must be available and unrestricted at every practice, at every break, and throughout every competition.
  • Athletes should begin activity already hydrated. A reasonable guideline is 16 ounces of fluid roughly two hours before activity, and another 8 to 16 ounces in the 15 minutes before activity begins.
  • During activity, athletes should drink approximately 4 to 8 ounces of fluid every 15 to 20 minutes. Athletes who sweat heavily may need more.
  • After activity, athletes should rehydrate with roughly 16 to 20 ounces of fluid for every pound of body weight lost during the session.
  • Athletes should never rely on thirst alone. By the time an athlete feels thirsty, mild dehydration has often already begun. Hydration should happen on a schedule, not only in response to feeling thirsty.
  • Coaches should be aware that overhydration is also a real, if rare, risk. Athletes who drink excessive amounts of water without adequate sodium intake can develop a dangerous condition involving abnormally low blood sodium. Balanced hydration, not simply “more water,” is the goal.

Heat Acclimatization

An athlete’s body needs time to adapt to exercising in heat. This adaptation, called heat acclimatization, meaningfully reduces the risk of heat illness, but it only works if programs give athletes that time rather than starting the season at full intensity.

NFMSS recommends a structured acclimatization period at the start of any season involving outdoor or high-intensity activity in warm conditions:

Days 1 and 2
Limit practice to a single session per day. Reduce or remove protective equipment where the sport allows it. Focus on lower-intensity conditioning and skill work rather than full-contact or maximum-exertion activity.

Days 3 through 5
Gradually increase intensity and equipment as athletes show they are tolerating the workload. Continue to limit teams to one practice session per day.

Day 6 and beyond
Full practice intensity and equipment may be introduced, provided athletes have tolerated the first five days without signs of heat-related distress.

Throughout this entire period, coaching staff should watch closely for early warning signs in individual athletes, particularly those who are new to the team, returning from injury or illness, out of playing shape, or otherwise more vulnerable than their teammates. Acclimatization is not just a calendar. It is an ongoing coaching responsibility.

Adjusting Practice to Real Conditions

Heat risk changes day to day, and practice plans should change with it rather than following a fixed schedule regardless of conditions. NFMSS expects member programs to assess actual heat and humidity conditions before each practice and adjust accordingly:

  • Lower-risk conditions: Practice may proceed normally, with regular hydration breaks maintained.
  • Moderate-risk conditions: Increase the frequency and length of rest and hydration breaks. Coaching staff should watch at-risk athletes more closely.
  • High-risk conditions: Significantly reduce practice intensity and time. Reduce or remove protective equipment where possible. Rest and hydration breaks become mandatory, not optional.
  • Extreme-risk conditions: Outdoor activity should be suspended entirely until conditions improve. Indoor activity should only continue if the indoor environment is meaningfully cooler and properly ventilated.

Air temperature alone does not tell the full story. Humidity, direct sun exposure, and wind all affect how much heat an athlete’s body can actually release. Programs are strongly encouraged to use a heat index or wet bulb temperature tool, where available, rather than relying on air temperature alone.

Additional Risk Factors

Certain athletes face elevated risk in hot conditions and deserve additional attention from coaching staff:

  • Athletes who are new to a sport or out of playing shape
  • Athletes returning from a prior illness, injury, or absence from training
  • Athletes with a prior history of heat illness
  • Athletes wearing heavier equipment or dark-colored uniforms
  • Athletes taking certain medications that affect sweating or heat tolerance
  • Athletes with a fever, or recent vomiting or diarrhea, who should not participate in hot conditions

Coaches do not need to diagnose these conditions. They need to know which athletes may be at elevated risk and adjust their attention accordingly.

Emergency Action Plan

Every NFMSS member program is expected to maintain a written, practiced emergency action plan specific to heat illness. At minimum, this plan should identify:

  • How staff will recognize a possible heat emergency
  • Immediate cooling steps, including access to water, ice, and shade
  • Who is responsible for calling emergency services and who will meet responders on arrival
  • The location of emergency equipment for every practice and competition venue
  • How parents or guardians will be contacted
  • How the incident will be documented afterward

Heat stroke is a true medical emergency. Cooling the athlete should begin immediately, before and during transport to further care, not delayed until arrival at a hospital or clinic. Every minute matters.

A Shared Responsibility

Heat safety is not the responsibility of one person on a coaching staff. Athletic directors are responsible for ensuring programs have a plan and the resources to follow it. Coaches are responsible for applying that plan every single day, in real conditions, not just when it is convenient. Parents and athletes are responsible for reporting symptoms honestly and taking them seriously. No middle school athlete should ever feel pressure to hide how they are feeling in the heat to stay on the field.