Melatonin Levels and Low‐Frequency Magnetic Fields in Humans and Rats: New Insights From a Bayesian Logistic Regression

Abstract

The present analysis revisits the impact of extremely low-frequency magnetic fields (ELF-MF) on melatonin (MLT) levels in human and rat subjects using both a parametric and non-parametric approach. In this analysis, we use 62 studies from review articles. The parametric approach consists of a Bayesian logistic regression (LR) analysis and the non-parametric approach consists of a Support Vector analysis, both of which are robust against spurious/false results. Both approaches reveal a unique well-ordered pattern, and show that human and rat studies are consistent with each other once the MF strength is restricted to cover the same range (with B ≲ 50 μT). In addition, the data reveal that chronic exposure (longer than ∼22 days) to ELF-MF appears to decrease MLT levels only when the MF strength is below a threshold of~30 μT (, i.e., when the man-made ELF-MF intensity is below that of the static geomagnetic field. Studies reporting an association between ELF-MF and changes to MLT levels and the opposite (no association with ELF-MF) can be reconciled under a single framework. Bioelectromagnetics. 2019;40:539-552.

MusE GAs FLOw and Wind (MEGAFLOW) VI. A study of C iv and Mg ii absorbing gas surrounding [O ii] emitting galaxies

“…Using the 22 MEGAFLOW MUSE fields, we searched for [O ii] emitters at redshift z =1.0-1.5 and found a total of 215 emitters down to a flux limit of ≈ 10 −17 erg s −1 cm −2 (Schroetter et , 2019Zabl et al 2019). For each of these 215 [O ii] galaxies, we searched in our catalog of C iv systems with REW > 0.05 Å for matches within 500 km s −1 and b < 250 kpc.…”

A 50 Hz magnetic field affects hemodynamics, ECG and vascular endothelial function in healthy adults: A pilot randomized controlled trial

“…Moreover, objective assessment should be conducted for symptomatic patients with muscle fatigue and pain, in more severe cases, patients with ischemic disorders such as atherosclerosis and diabetes, to clarify the effects and mechanisms of 50 Hz MFs on ischemic regions. In addition, by exposure to 50 Hz MFs, there is a possibility that some specific biomarkers, such as melatonin, cortisol, serotonin and dopamine, could be affected [ 43 , 44 ] and/or pain perception pathways via opioid receptors could be inhibited [ 45 ]. Further studies should be needed to investigate the MF-based therapeutic applications and elucidate the underlying mechanisms of MF effects on pain relief and recovery of muscle fatigue.…”