Magnetohydrodynamic Approach to Effective Blood-Flow Control Utilizing Extremely Low-Frequency Fields

In this paper, we investigated the magnetohydrodynamic effects of extremely low-frequency fields produced by a prototype diverted from an existing alternating magnetic therapy apparatus (AMTA). Diverting the use of a commercial AMTA, we prepared a prototype equipped with two additional coils for twisting the magnetic field of the apparatus. Five healthy male subjects ranging in age from 33 to 68 (two subjects each in their 30s and 40s, and one subject in his 60s) took part in this experiment. The heart beat fluctuation index [LF/HF: low frequency (LF) and high frequency (HF)] was measured with a prefrontal probe every 0.1 s during functional near-infrared spectroscopic (fNIRS) measurement sessions. Our experimental results showed the fact that the proper twisted magnetic fields induced from the prototyped machine were able to control the autonomic nervous system, judging from the LF/HF indexes on fNIRS measurements.