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Inter-Association Task Force on Exertional Heat Illnesses Consensus Statement

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Inter-Association Task Force on Exertional Heat Illnesses Consensus Statement Inter-Association Task Force on Exertional Heat Illnesses Consensus Statement These guidelines were established to increase safety and performance for individuals engaged in physical activity, especially in warm and hot environments. The risks associated with exercise in the heat are well documented, but policies and procedures often do not reflect current state-of-the-art knowledge. Many cases of exertional heat illness are preventable and can be successfully treated if onsite personnel identify the condition and implement appropriate care in a timely manner. Strategies to optimize proper care of dehydration, exertional heat stroke (EHS), heat exhaustion, heat cramps and exertional hyponatremia are presented here. This consensus statement was developed by medical/scientific experts experienced in the prevention, recognition and treatment of exertional heat illnesses. Overall Strategies for the Prevention of Exertional Heat and athlete's medical condition Illnesses • Lack of education and awareness of heat illnesses among Every athletic organization should have a policy, procedure or coaches, athletes and medical staff emergency plan established to address exertional heat illness- • No emergency plan to identify and treat exertional heat es. A thorough plan includes the key factors to prevent, identi- illnesses fy and treat exertional heat illnesses. • No access to shade during exercise or during rest breaks • Duration and number of rest breaks is limited Scientific evidence indicates the following factors may • Minimal access to fluids before and during practice and rest increase the risk associated with exercise in the heat. breaks Although some factors can be optimized (e.g., heat acclimati- • Delay in recognition of early warning signs zation), others cannot (e.g., health problems). Regardless, these factors may help in developing a proactive approach to pre- General Considerations for Risk Reduction venting exertional heat illnesses. • Encourage proper education regarding heat illnesses (for athletes, coaches, parents, medical staff, etc.). Education Intrinsic factors include: about risk factors should focus on hydration needs, • History of exertional heat illnesses acclimatization, work/rest ratio, signs and symptoms of • Inadequate heat acclimatization exertional heat illnesses, treatment, dietary supplements, • Lower level of fitness status nutritional issues and fitness status. • Higher percent body fat • Provide medical services onsite (e.g., certified athletic • Dehydration or overhydration trainer [ATC], emergency medical technician [EMT], • Presence of a fever physician). • Presence of gastrointestinal illness • Ensure pre-participation physical examination that includes • Salt deficiency specific questions regarding fluid intake, weight changes • Skin condition (e.g., sunburn, skin rash, etc.) during activity, medication and supplement use and history • Ingestion of certain medications (e.g., antihista- of cramping/heat illnesses has been completed. mines, diuretics, etc.) or dietary supplements (e.g., • Assure that onsite medical staff has authority to alter ephedra, etc.) work/rest ratios, practice schedules, amount of equipment • Motivation to push oneself/warrior mentality and withdrawal of individuals from participation based on • Reluctance to report problems, issues, illness, etc. environment and/or athlete's medical condition. • Pre-pubescence DEHYDRATION Extrinsic factors include: Factors Contributing to Onset of Condition • Intense or prolonged exercise with minimal breaks When athletes do not replenish lost fluids, they become • High temperature/humidity/sun exposure (Table 1 dehydrated. Mild dehydration (<2% body weight loss [BWL]) is and Figure 1), as well as exposure to heat/humidity in often unavoidable because athletes cannot always replenish preceding days fluids at a rate equal to that being lost. Dehydration as • Inappropriate work/rest ratios based on intensity, wet bulb minimal as 2% BWL can begin to hinder performance and globe temperature (WBGT), clothing, equipment, fitness thermoregulatory function. 1 Table 1 Wet Bulb Globe Temperature Risk Chart WBGT Flag Level of Risk Comments Color <65°F (<18°C) Green Low Risk low but still exists on the basis of risk factors 65°-73°F (18°-23°C) Yellow Moderate Risk level increases as event progresses through the day 73°-82°F (23°-28°C) Red High Everyone should be aware of injury potential; individuals at risk should not compete >82°F (>28°C) Black Extreme or Consider rescheduling or delaying the event until hazardous safer conditions prevail; if the event must take place, be on high alert. Take steps to reduce risk factors (e.g., more and longer rest breaks, reduced practice time, reduced exercise intensity, access to shade, minimal clothing and equipment, cold tubs at practice site, etc.). The WBGT can be measured with a WBGT meter. The calculation for the determination of WBGT is: WBGT = .7 (Wet Bulb Temperature) + .2 (Black Globe Temperature) + .1 (Dry Bulb Temperature). This table was originally printed in Roberts WO. Medical management and administration manual for long distance road racing. In: Brown CH, Gudjonsson B, eds. IAAF Medical Manual for Athletics and Road Racing Competitions: a Practical Guide. Monaco: International Association of Athletics Federations;1998:39-75. Optimal hydration is the replacement of fluids and • Athletes should begin exercise sessions properly hydrated. electrolytes in accordance with individual needs. Fluid intake Any fluid deficits should be replaced within 1 to 2 hours should nearly approximate fluid losses. Athletes must person- after exercise is complete. ally establish and monitor fluid requirements and modify • Given the nature of sweat and variability and timing of behavior to ensure optimal hydration status. Fluid intake nutritional intake, hydrating with a sports drink containing beyond fluid needs for many hours also can be quite harmful carbohydrates and electrolytes (i.e., sodium and potassium) (see Exertional Hyponatremia). before and during exercise is optimal to replace losses and provide energy. Because athletes replace only about half of Recognition the fluid lost when drinking water, a flavored sports drink Indicators include dry mouth, thirst, irritability, general dis- may promote an increase in the quantity of fluids consumed. comfort, headache, apathy, weakness, dizziness, cramps, chills, • Replacing lost sodium after exercise is best achieved by vomiting, nausea, head or neck heat sensations, excessive consuming food in combination with a rehydration fatigue and/or decreased performance. beverage. • Athletes should have convenient access to fluids Treatment throughout practice and be allowed to hydrate in addition The following procedures are recommended if dehydration is to prescribed breaks. These factors can minimize suspected: dehydration and may maximize performance. • Dehydrated athletes should move to a cool • A nauseated or vomiting athlete should seek medical environment and rehydrate. attention to replace fluids via an intravenous line. • Maintaining normal hydration (as indicated by baseline body weight) is critical to avoiding heat Return-to-Play Considerations illnesses. If an athlete's BWL is greater than 1% to If the degree of dehydration is minor and the athlete is symp- 2% within a given day or on consecutive days, that tom free, continued participation is acceptable. The athlete athlete should return to normal hydration status must maintain hydration status and should receive periodic before being allowed to practice. (Remember that checks from onsite medical personnel. pre-exercise/event/participation examination body weight baseline measures may not accurately assess EXERTIONAL HEAT STROKE hydration status if post-practice body weight is being Factors Contributing to Onset of Condition compared to a baseline that is measured in a Exertional heat stroke is a severe illness characterized by cen- dehydrated state. Urine specific gravity or urine tral nervous system (CNS) abnormalities and potentially tissue color can help with this assessment if an athlete is damage resulting from elevated body temperatures induced by suspected to be dehydrated at the time baseline strenuous physical exercise and increased environmental heat measurements are taken.) stress. 2 Recognition Provided that adequate emergency medical care is available The ability to rapidly and accurately assess core body onsite (i.e., ATC, EMT or physician), it is recommended to temperature and CNS functioning is critical to the proper cool first via cold water immersion, then transport second. evaluation of EHS; axillary, oral and tympanic temperatures Cooling can be successfully verified by measuring rectal tem- are not valid measures in individuals exercising in hot perature. If onsite rapid cooling via cold water immersion is environments. Medical staff should be properly trained and not an option or if other complications develop that would equipped to assess core temperature via rectal thermometer be considered life threatening (i.e., airway, breathing, circula- when feasible. tion), immediate transport to the nearest medical facility is essential. Most critical criteria for determination are (1) CNS dysfunc- tion (altered consciousness, coma, convulsions, disorienta- The following procedures are recommended if EHS is tion, irrational behavior, decreased mental acuity, irritability, suspected: emotional instability, confusion, hysteria, apathy) and (2) • Immediately immerse athlete in tub of cold water
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