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A condition of elevated body temperature.



the accumulation of excess heat in the body of humans or animals, with an elevation of body temperature, caused by external factors that hinder the transfer of heat to the external environment or increase heat intake from outside the body. Hyperthermia arises when there is maximum strain on the physiological mechanisms of thermoregulation (perspiration, dilation of cutaneous blood vessels, and so forth); if the causes are not removed, it progresses, ending with heat stroke at a body temperature of approximately 41°-42° C.

Hyperthermia is accompanied by an increase of metabolism and qualitative disturbances of it, loss of water and salts, and disruption of blood circulation and the delivery of oxygen to the brain, causing agitation and sometimes convulsions and fainting. High temperature during hyperthermia is tolerated less readily than it is in other feverish diseases. The development of hyperthermia is promoted by an increase in heat production (for example, during muscular work), disruption of thermoregulation mechanisms (with narcosis, drunkenness, and certain diseases), or age-related failure of these mechanisms (in very young children). Artificial hyperthermia is used in treating certain nervous and slowly progressing chronic diseases.


References in periodicals archive ?
All athletes, coaches, athletic trainers and parents and guardians should be aware of the risk factors for heat illness, follow recommended strategies and be prepared to respond quickly to symptoms of illness," the study's authors wrote.
1) Heat exhaustion is the most common form of exercise related heat illness, and realistically, likely encompasses the first three subcategories of heat illness.
The symptoms of heat illness include feeling hot, thirsty, tired, sick, dizzy and irritable.
Varying degrees of signs and symptoms of heat illness may be present depending upon the magnitude of exposure, individual's age, and previous health status.
Heat prostration is a relatively mild form of heat illness.
California's Heat Illness Prevention Standard--the first in the nation--demonstrates the effectiveness of this collaborative approach.
Industries affected by high heat procedures are: Agriculture, Construction, Landscaping, Oil and gas extraction, Transportation or delivery of agricultural products, construction materials or other heavy materials Californias Heat Illness Prevention Standard requires employers to train workers on the signs and symptoms of heat illness, provide shade when temperatures exceed 80 degrees, allow workers to take cool down rest breaks in the shade and develop emergency response procedures and train workers on how to execute those procedures when necessary.
People in supervisory positions such as coaches, trainers, and lifeguards should be giving training specifically to recognize signs of heat illness and other kinds of preventive measures.
Heat illness expert George Havenith also claimed "inadequate" planning for the treatment of casualties contributed to the deaths of James Dunsby, Craig Roberts and Edward Maher.
Both Lance Corporals were pronounced dead on the Brecon Beacons, having succumbed to heat illness, while Cpl Dunsby died later in Birmingham's Queen Elizabeth Hospital.