Overview

Heat exhaustion occurs when the body struggles to regulate its temperature in hot and humid conditions, especially when combined with insufficient hydration, excessive physical activity, and inappropriate clothing. Children and adolescents take time to acclimatise because of temperature changes: studying temperature fluctuations in children and adolescents. They also generate more heat during activity than adults and have a lower sweating rate. Sweating is a natural mechanism of the body for cooling down the body. Children and teens often forget to take a break or hydrate while playing or engaging in physical activities, which increases the risk of heat-related illness. 

Heat sickness can be more severe in children and teens with chronic diseases or those taking certain medicines. Also included are children and teens who are overweight or wear heavy clothing during physical activities in a marching band or football team, for instance.¹

Heat exhaustion

It is caused by the body's loss of water and electrolytes. It happens when working in hot conditions and producing too much sweat without a matching replacement of water and salts. The body’s natural cooling system (i.e., sweating) can become overwhelmed if fluids are not replenished, leading to a dangerous imbalance. Heat exhaustion is caused by the body's failure to dissipate heat adequately; if the condition persists without treatment, it can turn out to be a dangerous heat stroke, a life-threatening condition.¹

Causes

Heat exhaustion develops when a person is exposed to high temperatures and exercises, which makes them sweat a lot and develop shortness of breath.²

1. Exposure to heat: among them, heat exhaustion is common in hot climates or in high-risk, hot environments that are poorly ventilated or shaded
2. Dehydration: Sweating causes the body to lose vital fluids and electrolytes, and it is even more so during exercise or after exposure to direct sunlight. Such fluids and electrolytes should be replenished by drinking water or beverages containing electrolytes, since depletion results in rapid dehydration
3. Inadequate fluid intake: This insufficiency can be worsened by inadequate fluid intake, particularly water, during hot weather or any form of physical exertion, thereby disturbing the normal body temperature range, so it is crucial to drink water or electrolyte-containing beverages
4. Increased risk factors: predisposing factors include wearing a rigid dress that hampers heat dissipation, advancing age or young children, certain illnesses and certain treatments like cardiac disease, hypertension, or the use of drugs or alcohol that are likely to alter the body’s heat stress response
5. Physical activity: strenuous exercise develops heat in the body, and this is made worse by exercises in hot climates. But if the body cannot lose heat to such through sweating or other factors such as water scarcity, then it results in heat stroke

Signs and symptoms

Heat exhaustion results in a variety of signs and symptoms:²

1. Heavy sweating: Profuse sweating without the typical cooling effects can be an early sign of heat exhaustion.  This is the body’s way of trying to reduce temperature, but it is dangerous since it leads to dehydration and other problems
2. Pale, cool, and moist skin: skin may be cold and clammy, although the temperature of the body is elevated or even normal. This is because the body cools the skin through the beads of sweat formed through evaporation
3. Muscle cramps: tense swelling due to cramps in the legs, arms, or abdomen and within the muscles is another problem that can result from the loss of electrolytes through sweat
4. Fatigue and weakness: Some people may experience minor symptoms such as fatigue and weakness, sometimes dizziness or light-headedness may set in while the body tries to regulate its temperature to cool down
5. Headache: temperature may bring pulsating headaches accompanied by nausea and dizziness, especially when one is dehydrated
6. Nausea or vomiting: the body’s stress and discomfort signals can contribute to having diarrhoea, nausea, or vomiting as the body tries to cope with overheating
7. Rapid heartbeat: The heart rate may rise as the body works harder to attain an optimum body temperature, and the blood is diverted towards the skin to aid in heat dissipation
8. Dark urine: Peculiarly dark-coloured or concentrated urine is one of the symptoms of dehydration and often accompanies heat exhaustion

Treatment

When ignored, heat exhaustion may develop into heat stroke, which is even more dangerous; therefore, early treatment is crucial.³

1. Move to a cooler environment: move the person to a cooler area of the house,  to an area that is in the shade, or even just to an air-conditioned indoor location to help cool down
2. Rest and rehydrate: encourage the person to sit or lie down. Remind them to take cool water or electrolyte drinks to help them regain their fluids. Avoid alcohol or caffeinated products, as these dehydrate the body
3. Cooling measures: examples include giving the person cool showers or wet compressions, dousing the patient with cold water, or using fans to enhance the evaporation of sweat to bring their body temperature down
4. Loosen clothing: assist the person if they can let them undo or strip off some of their tight or unnecessary clothes for cooling purposes
5. Monitor symptoms: sit with the person and observe what happens to them. However, if mild symptoms worsen or if there is no improvement within half an hour, then the doctor must be seen immediately
6. Medical evaluation: vomiting, a temperature of 104°F or 40°C, or prolongation of the symptoms after initial treatment should be a signal that the person has a heat stroke, and medical help should be sought immediately

Prevention

Measures can be taken to avoid heat exhaustion, which includes measures to avoid growing more and more worn out with the heat or while out in the hot sun and other cases that may involve undertakings in hot regions:²

1. Stay hydrated: ensure you consume lots of liquids, water, or other fluids other than alcoholic and caffeine-containing drinks, even if your body is not thirsty. That is why water should be preferred, but other electrolyte-containing beverages will replenish salts lost in sweat
2. Avoid direct sun: avoid going out during the worst times, that is, from 10 in the morning to 4 in the afternoon. If you have to go out in the sun, stay under trees or use an umbrella or a broad-brimmed hat to avoid the sun
3. Wear appropriate clothing: the clothes should be lightweight, like cotton, unrestricted, and light in colour to produce the effects of the arcades, which hasten the evaporation of sweat
4. Use sunscreen: sunburn can impair your body's ability to cool down, so ensure you wear sunscreen with a higher SPF
5. Take breaks: when you are outdoors, either jogging, fishing, or working under the sun, try to take your break under tree shade or in a cool region. These are good periods to either take a sip of water or maybe take a little nap
6. Adjust your body: if you’re not accustomed to working or exercising outdoors, start off at a gradually progressing intensity over a few days, depending on the heat
7. Cool your environment: the body should be cooled using fans, air conditioners or cool water baths and showers after coming from a hot place to help your body recover
8. Know your limits: listen to your body, and if the person starts to fumble and get warm, it is high time to turn off the equipment and have a proper break
9. Monitor weather conditions: people should become familiar with the type of weather, especially during the hot season, and adjust this schedule to the weather forecast. In case it is possible, try to do those activities at certain times of the day with cooler temperatures, like morning or evening
10. Protect vulnerable individuals: be especially alert for heat-causing factors in infants, children, elderly people, and persons with chronic diseases or those on medications that affect heat tolerance.

Long-term measures to avoid heat exhaustion

1. Maintain physical fitness: The pedometer says that exercise enhances heat tolerance, but it must be gradual: start with low-intensity exercises, then gradually increase the intensity
2. Nutrition: taking foods with the right proportions of electrolyte balance, such as sodium and potassium, helps maintain body hydration
3. Workplace adjustments: employees who work under extreme heat, employers should ensure that employees have access to water, are allowed to take breaks, and have shaded or air-conditioned areas to rest

How does heat exhaustion relate to excessive sweating?

Heat exhaustion normally causes sweating, and when the body fails to regulate the heat, it is secreted profusely. When in warm water or exercising, the body starts to perspire to reduce temperature. However, it needs to be noted that if a person is not properly hydrated or in a high humidity condition, then this sweating is not enough to help regulate body temperature. This can lead to symptoms of heat exhaustion, including excessive sweating, weakness, dizziness, and nausea. There are several indicators that the body’s extremities may be overheating and that heat exhaustion or heat stroke may be imminent, including sweating profusely.⁴

Summary

High temperatures and high humidity, especially coupled with insufficient drinking, lead to heat injuries in children and teens. These include raised temperatures, physical activities, age, illnesses, use of drugs, type of dress code, lack of water, and the environment in which one lives. Signs and symptoms include excessive salivation, pallor, muscle twitches, lethargy, lightheadedness, and vomiting. Treatment includes going to the stimulated area and avoiding any extra exertion, drinking fluids, applying cool techniques, and consulting a doctor if the signs get worse. As for prevention strategies, they range from drinking water to avoiding exposure to direct sunlight, wearing proper clothing, taking a break, heat acclimatisation, cooling the environment, knowing one’s limitations, and protecting vulnerable persons. Long-term implications involve sustaining issues related to fitness, nutrition, and workplace adaptations. Other than clamminess and breathing being hard or rapid it could also be an indication that the body is struggling to manage heat efficiently enough.