Weak electromagnetic field configuration differentially shapes cellular redox and metabolic responses

Abstract Weak electromagnetic fields (WEMF) can modulate cellular redox biology, but whether biological outcomes are determined by field intensity alone or by field configuration remains unclear. Therapeutic nuclear magnetic resonance (tNMR) combines a low-intensity magnetic sweep field (SF) with an orthogonal radiofrequency (RF) component. Here, we separated the tNMR components and exposed NIH3T3 cells to SF, RF, or full tNMR during hypoxia. Following reoxygenation, cellular responses were analyzed using compartment-specific reactive oxygen species measurements, bioenergetic profiling, metabolite analysis, and redox-cofactor readouts. SF appeared to induce a redox-partitioned response profile marked by increased extracellular H₂O₂​ and reduced mitochondrial H₂O₂. RF produced a metabolite and redox-cofactor profile characterized by an increased calculated cytosolic NAD⁺/NADH ratio and reduced intracellular lactate. Full tNMR, in turn, was associated with a modest increase in the mitochondrial MitoSOX signal, most apparent immediately after reoxygenation, and a larger total cellular NADP(H) pool. Despite these distinct redox-metabolic profiles, the derived respiratory and glycolytic stress-test parameters remained comparable among groups. Together, these findings identify field configuration, rather than field intensity alone, as a key determinant of cellular redox and metabolic responses.