noun - Hyperthermia is an abnormally high body temperature, usually resulting from warm water, warm temperatures, bright skies and/or humidity, during open water races, especially common during intense competitions or complicated due to dehydration. Several degrees of severity exist, starting with Heat Edema with the swelling of hands and feet. Heat Stroke is a medical emergency with potential for profound confusion, loss of coordination, hallucinations and coma, typically with a core body temperature of greater than 104°F. Between these two extremes there are intermediate degrees of severity, including (in order) Heat Syncope, Heat Cramps and Heat Exhaustion.
The doctors were ready to deal with cases of hyperthermia due to the hot water conditions under sunny skies.