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INFLUENCE OF REGULAR MAXIMAL BREATH-HOLDS ON CARDIAC STATUS IN ELITE BREATH-HOLD DIVERS

I.E. ZELENKOVA (1,3), P.S. CHOMAHIDZE (1), Е. Е. ACHKASOV (1,2) 1 -SECHENOV FIRST MOSCOW STATE MEDICAL UNIVERSITY, MOSCOW, RUSSIA 2 -SCIENTIFIC CENTER OF BIOMEDICAL TECHNOLOGIES OF FMBA OF RUSSIA, MOSCOW, RUSSIA 3 -ANOKHIN INSTITUTE OF NORMAL PHYSIOLOGY, MOSCOW, RUSSIA
Thirty volunteers (mean age – 34.5±1.6 years) weredevidedintwogroups. GroupI: 15 male breath-hold divers with training experience more then two years. Group II: 15 healthy untrained males. The mean heart rate was: group I 58±3.7 beats/min, group II 66,1±3,2 beats/min. Minimum heart rate was 50±3.3 beats/ min in group I and 41.6±2.1 beats/min in group II. The maximum heart rate in group II was 118±9.6 beats/min and 126.4±7.3 beats/min in group I. The main characteristic of breath-hold divers was the registration of group supraventricular arrhythmias: in 4 people (27%) supraventricular couplets and triplets were registered. Just three (20%) cases of coming AV block-I, and II at night was registered in group I. In group II such changes were not found. Ultrasound study showed increased seizes of left ventricular, left atrium and right ventricular volume comparing with group I. These changes found in breath-hold divers are not clinical significant and do not limit the athlete performance.
Keywords: 
breath-hold divers, arrythmia, freediving, ECG, hypoxia, physical exercise, sports medicine.