Swimming and loss of consciousness.
Under certain circumstances, even a good swimmer may drown during swimming exercise. Two cases of drowning, a survivor and a dead, during swimming exercise in swimming-pool are described. These cases and experimental researches with dogs indicate that the initial aspiration of water may cause extremely low heart rate and low blood pressure by reflex vagal inhibition, which deprive a good swimmer of his consciousness and make him drown.
D001049:Apnea / Q000473:pathology; D001794:Blood Pressure; D002648:Child; D003645:Death, Sudden / Q000473:pathology*; D004332:Drowning; D004569:Electroencephalography; D006339:Heart Rate; D006801:Humans; D001239:Inhalation; D008297:Male; D013550:Swimming; D014474:Unconsciousness / Q000473:pathology*