Quantitative analysis and safety assessment for biological effects of ELF electromagnetic environment

本研究的第一个目的是建立分析和评估人体电场暴露的方法。第二个目标是利用生物遥测技术定量地阐明电场的生物效应。这项研究包括发展数值分析技术和测量技术，测量活体中的照射剂量，以及寻找可以定量评估的生物效应。通过本研究，取得了以下成果：1）开发了适用于活体的电场数值分析技术和电场测量技术。电场和感应电流的分布可以在人体的所有部位成功地测量。2）使用研究中开发的技术，当人体暴露于电场治疗仪器中的电场时，测量人体中的电场和感应电流。3）利用该方法可以得到人体表面电场和感应电流的分布。结果揭示了人体特定部位的场集中方式。同时也揭示了感应电流密度变高的现象（热点）在身体的某些部位。4）通过本研究的定量分析，明确了场知觉的部分机制和知觉水平个体差异的原因。5）作为电场暴露引起的生理变化，新发现了人体表面的血流变化现象，完成了本研究的大部分目的，并获得了一些有意义的新发现。

The first aim of this study is to establish the methods for the analysis and the evaluation of the electric field exposure to a human body. The second aim is to clarify the biological effect of electric field quantitatively using biotelemetry techniques. This study included the development of numerical analysis techniques and measurement techniques, the measurement of exposure dose in a living human body and the search for the biological effects that can be evaluated quantitatively. Through this study, the following results were obtained.1) We have developed a numerical analysis technique and a measurement technique of an electric field, which are applicable to a living human body. The distribution of the electric field and the induced current could be measured successfully over all parts of a human body.2) Using the techniques developed in the study, the electric field and the induced current were measured in the human body when it was exposed to the electric field in the instrument of an electric field therapy.3) We could obtain the distribution of the surface electric field and the induced current with a living human body. The results revealed the manners of the field concentration on specific parts of the body. It also revealed that the density of the induced current became high (hot spots) at some parts of the body.4) Through the quantitative analysis of this study, a part of the mechanism of the field perception and the cause of the individual difference in the perception level were made clear.5) As a physiological change caused by the electric field exposure, the phenomenon of blood flow change in a human body surface was newly discovered.In conclusion, the most part of the purpose of this study was accomplished, and some significant new findings were obtained.