Underwater bradycardia.
D001049:Apnea / Q000150:complications; D001919:Bradycardia / Q000209:etiology*; D006339:Heart Rate; D006801:Humans; D007101:Immersion; D008297:Male; D005082:Physical Exertion; D013178:Sports Medicine; D013550:Swimming; D013997:Time Factors