Ch. 21 Heat Related Emergencies

how the body stays cool
the body works constantly to disperse the heat it produces
when heat is produced faster than the body can lose it, heat illness results (heat cramp, heat exhaustion, heatstroke)
water loss helps cool body
electrolyte loss helps cool body

water loss
adult body weight is 50-60% water
when the body loses water faster than it take it in, dehydration occurs
drink 8 ounces of water every 20 minutes

electrolyte loss
sweat and urine contain potassium and sodium
essential electrolytes that control the movement of water in and out of cells
most people require only water
sports drinks can be useful during vigorous physical activity

effects of humidity
sweat can cool the body only if it evaporates
sweat will not evaporate in high humidity
the higher the humidity, the lower the temperature at which heat risk begins

who is at risk for heat related emergencies
elderly people because of increase in cardiac output and decreased ability to sweat
infants and young children
children and pets when left in cars

heat illnesses
include a range of disorders
some are common but only heatstroke is life threatening

recognizing heat cramps
sudden, painful muscle spasms
occurs in back of leg or abdomen
occurs during or after physical exertion

care for heat cramps
have victim stop activity and rest in cool place
stretch cramped muscle
remove excess or tight clothing
provide water or sports drink

recognizing heat exhaustion
heavy perspiration with normal or slightly above normal body temperature
heavy sweating
severe thirst

care for heat exhaustion
have victim stop activity and rest in cool place
remove excess or tight clothing
provide water or sports drink
have victim lie dow; raise legs 6-12 inches
apply cool, wet towels to victim
seek medical care if condition does not improve

recognizing heatstroke
body temperature becomes extremely high
rapid intervention is needed

signs of heatstroke
extremely hot, dry skin

care for heatstroke
have victim stop activity and move to cool place
call 911
if unresponsive, open airway, check breathing and provide care
rapidly cool patient with cool, wet towels, fanning, cold packs

Radiation -Heat transfer from surface of one object to surface of another object without direct contact -Primary way the body loses heat Convection -Cold air in immediate contact with the skin is warmed by the skin -Heated molecules move away, …

Heat exhaustion: This condition often occurs when people exercise in a hot, humid place and body fluids are lost through sweating, causing dehydration and overheating of the body. Temperature may be elevated, but not above 104 F (40 C). Occurs …

True 1. True or False If you have to be out in hot environments, you must take precautions to prevent heat emergencies. Digesting salt pulls water away from your muscles. 2. Why should you stay away from salt if you …

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Exertional heat exhaustion is caused by the sudden onset of thermoregulatory failure, which can lead to death if untreated False, Exertional heat stroke would cause this Death is imminent if the core body temperature rises above 104 F for an …

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