The SR and the cardiovascular system (HRV, blood pressure)

Some studies suggest correlations between the parameters of the Schumann resonance or broader geomagnetic activity on the one hand and cardiovascular indicators on the other — especially heart rate variability (HRV) and blood pressure. These works tend to be cited as a hint that the external electromagnetic environment may be related to the autonomic regulation of the circulation.

The results, however, are not consistent: they differ in both the sign and the size of the effect, often work with small samples and find it difficult to separate the influence of the SR from geomagnetic activity, weather, time of day and lifestyle. Correlation moreover does not imply causation — an observed association may be mediated by a third variable. For this reason this area must be read as a hypothesis supported by ambiguous correlational data, not as a proven influence of the SR on the heart and blood vessels. No health recommendations can be drawn from these data.