Table 2 Summary of magnetic and HRV frequency ranges used in measurements.

From: Long-Term Study of Heart Rate Variability Responses to Changes in the Solar and Geomagnetic Environment

Measurement frequency ranges
Schumann resonance power 3.5–36
Magnetic field ULF power 0.002–3.5
Total power 0–0.4
Very low frequency 0.003–0.04
Low frequency 0.04–0.15
High frequency 0.15–0.4