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Evidence-Based Complementary and Alternative Medicine
Volume 1, Issue 2, Pages 187-191
http://dx.doi.org/10.1093/ecam/neh024
Original Article

Study on Application of Static Magnetic Field for Adjuvant Arthritis Rats

1Kansai College of Oriental Medicine, Sennan-gun, Osaka, Japan
2Department of Pharmacology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
3Department of Science, Pip-Fujimoto Co., Ltd, Chuo-ku, Osaka, Japan

Received 15 January 2004; Accepted 30 April 2004

Copyright © 2004 Norimasa Taniguchi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In order to examine the effectiveness of the application of static magnetic field (SMF) on pain relief, we performed a study on rats with adjuvant arthritis (AA). Sixty female Sprague–Dawley (SD) rats (age: 6 weeks, body weight: approximately 160 g) were divided into three groups [SMF-treated AA rats (Group I), non-SMF-treated AA rats (Group II) and control rats (Group III)]. The SD rats were injected in the left hind leg with 0.6 mg/0.05 ml Mycobacterium butyrium to induce AA. The rats were bred for 6 months as chronic pain model. Thereafter, the AA rats were or were not exposed to SMF for 12 weeks. We assessed the changes in the tail surface temperature, locomotor activity, serum inflammatory marker and bone mineral density (BMD) using thermography, a metabolism measuring system and the dual-energy X-ray absorptiometry (DEXA) method, respectively. The tail surface temperature, locomotor activity and femoral BMD of the SMF-exposed AA rats were significantly higher than those of the non-SMF-exposed AA rats, and the serum inflammatory marker was significantly lower. These findings suggest that the pain relief effects are primarily due to the increased blood circulation caused by the rise in the tail surface temperature. Moreover, the pain relief effects increased with activity and BMD of the AA rats.