# Schumann Resonances and the Human Body: Questions About Interactions, Problems and Prospects
## 3 Results
### Earth's Magnetic Field and Schumann Resonance Frequencies: Origin and Essence
This was interpreted by the researchers as evidence that the daily functioning of the autonomic nervous system responds to changes in geomagnetic and solar activity, synchronizing with time-varying magnetic fields that are associated with SRs and geomagnetic field line resonances. In 2018, a long-term study to investigate the relationship between solar and magnetic factors and the reactions of the autonomic nervous system to changes in solar and geomagnetic activity was carried out [116]. To achieve this, a group of participants under went weekly 72 h heart rate variability recordings over a five-month period. The study established correlations between geomagnetic and solar variables and measures of heart rate variability. The results of these studies established that the daily functioning of the autonomic nervous system responds to changes in solar and geomagnetic activity. The increase in solar wind intensity correlated with an increase in heart rate, and this was interpreted by the researchers as a biological response of the human body to stress. Increases in parasympathetic activity and heart rate variability were observed with increasing solar radio flux, cosmic ray flux and Schumann resonance power. 4.2 Results of Studying the Interaction of Schumann Resonances with the Cardiovascular System of the Human Body  
Scientific research has aimed at identifying the relationships between SRs and generally accepted indicators of the functional activity of the cardiovascular system such as heart rate/pulse, blood pressure and heart rate variability. In 2005, scientists from the Oriental Medical Center and Telecommunications University (Tokyo, Japan) and from the Chronobiology Laboratory of the University of Minnesota (USA) found a significant decrease in the group average values of diastolic blood pressure, systolic blood pressure, mean arterial pressure and pulse on days when an increase in SRs was observed. Disease-related illnesses had a negative correlation with the response of blood pressure, systolic blood pressure, diastolic blood pressure, mean blood pressure and double product to SRs. This led to the assumption that on days with elevated SRs, patients with lower blood pressure levels have better health. Health-related lifestyle had a negative correlation with the responses of blood pressure, diastolic blood pressure and mean arterial pressure to SRs. Gender differences were found: men had higher reactivity in blood pressure, diastolic blood pressure and mean arterial pressure compared to women [117]. In 2017, based on assessing the parameters of the intervals between heartbeats, an international team of scientists developed a new method for analyzing the degree of synchronization of the physiological state of the human body with changes in the Earth's magnetic field [118]. The results of the study confirmed the fact that slow rhythms of heart rate variability can synchronize with changes in local magnetic field data and that the degree of synchronization is influenced by the quality of interpersonal relationships. In 2021, a global study was carried out to study heart rate synchronization with the Earth's time-varying magnetic field [99], which involved volunteers from California, Lithuania, Saudi Arabia, New Zealand and England. It was found that changes in geomagnetic conditions affect the rhythms of the brain and heart and the activity of the autonomic nervous system. An alternative direction of research was the exploration of the influence of the Earth's magnetic field on the occurrence of diseases in the cardiovascular system. The idea of such studies was that in patients with NCDs, the body's adaptive reserves have been exhausted, and the stress of changes in the Earth's electromagnetic field will be a factor that will lead to an exacerbation or emergence of a life-threatening condition. For example, in 2023, the results of a five-year study examining the relationship between the Earth's local magnetic field and acute myocardial infarction were published [119].