交流磁場曝露が血流速度に与える影響に関する評価

抄録

This study focuses on the acute influence of non-thermal alternating current (AC) electromagnetic field (EMF) exposure (50 Hz, peak magnetic flux density Bmax180 mT, 15-min duration of exposure) on blood flow velocity in healthy human subjects. Healthy subjects (11 males, age range 21-56 years) participated after signing an informed consent form approved by the university's institutional review board. The values of the blood flow velocity in an ulnar artery in a biceps brachii were measured and compared with two different exposures, i.e., the sham control (CTL) exposure and the EMF exposure. The EMF exposure was randomly applied to either forearm or neck. In a randomized, double-blind, and counterbalanced manner, the CTL exposure and the EMF exposure were carried out. The values of the blood flow velocity in the CTL exposure were significantly decreased compared with the baseline value (indicated as 100%), probably due to immobility stress-induced ischemic conditions by preventing the arm from moving. In forearm exposure, the values of the blood flow velocity were significantly increased by the EMF exposure during and after exposure periods compared with the CTL exposure. In neck exposure, the values of the blood flow velocity were not significantly changed by the EMF exposure, but there were significant differences between the control and EMF groups. When considering the physiological significance of the non-thermal EMF effects, these results imply that the physiological role of the EMF-enhanced blood circulation might help eliminate the metabolic waste products and endogenous pain producing substances inducing muscle stiffness and pain.