title: Microtesla extremely low frequency magnetic fields may ameliorate hypertension.
abstract: We studied the effects of a micro-Tesla extremely low frequency magnetic field (microT ELFMF) on blood pressure. A 1-muT magnetic field was generated by Helmholtz coils (L, 3.0 meters; H, 1.7 meters) with 8/6-Hz alternating current. This study was carried out between March 2004 and March 2005, and data from a total of 30 volunteers were analyzed. The subjects' blood pressure was measured before and after exposure, at baseline, and 1, 2 and 3 months after the first ELFMF session. The mean age of the subjects was 46.5 years (range, 28-72 years). The median number of ELFMF sessions was 31.5, and the median duration of each session was 10.0 min (range, 2.0-120.0 minutes). In the hypertensive and normotensive subgroups, the difference between the baseline and 3-month pre-exposure systolic blood pressure (SBP) measurements was statistically significant (p<0.001, p=0.013, respectively; paired t-test). The SBP of the hypertensive subgroup decreased more than that of the normotensive subgroup. These data suggest that the microT ELFMF may have a hypotensive effect on subjects, particularly hypertensive subjects.
authors.affiliation: Department of Clinical Trial Design and Management, Translational Research Center, Kyoto University Hospital, Kyoto, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nishimura
authors.forename: Kaneo
authors.initials: K
authors.lastname: Mohri
authors.forename: Harue
authors.initials: H
authors.lastname: Tada
authors.forename: Junichi
authors.initials: J
authors.lastname: Yamada
authors.forename: Masahiro
authors.initials: M
authors.lastname: Suzumura
authors.forename: Masanori
authors.initials: M
authors.lastname: Fukushima
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001794:Blood Pressure / Q000502:physiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006973:Hypertension / Q000503:physiopathology / Q000628:therapy*; D008280:Magnetics / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D016896:Treatment Outcome