Two groups of acute cardiac events and environmental physical activity

Recent studies have shown correlation between environmental physical activity and the number of cardiovascular risk events and factors. The aim of this study was to check possible links between the courses of two groups of acute cardiac events - sudden cardiac death (SCD) and occurrence of acute myocardial infarction (AMI), and solar (SA), geomagnetic (GMA) and cosmic ray (CRA) activities. Daily medical data (1096 days in 2003-2005) were taken from the Grand Baku Area's Ambulance Stations. We studied 788 SCD, 4919 AMI patients and 440 AMI fatal events before their admission to hospital. The studies have revealed a rise in both SCD and AMI numbers on days of the extreme (high and low) GMA levels. Due to rare GMA storms in the considered middle latitudes the most cardiac events are concentrated at the GMA lowest levels accompanied by comparatively high levels of CRA (neutron activity at the Earth surface). The correlation between GMA and relevant CRA was more significantly expressed for monthly SCD, fatal AMIs, and for all the AMIs. Despite the daily raise of AMI mortality at highest GMA levels, the days of lowest GMA and accompanied high CRA levels are much more predominant for AMI occurrence and acute (prehospital) mortality. In monthly comparison it was also an inverse correlation of both acute cardiac events with SA and GMA. We have concluded that both SCD mortality and AMI occurrence increase in low GMA and accompanied high CRA (neutron) levels and, GMA and CRA may be considered as one of the significant regulating factors in human homeostasis. Not only high, but also low levels of GMA affect the number of the considered acute cardiac events.