Heart Rate and Blood Pressure Changes during Radiofrequency Irradiation andEnvironmental Heating

摘要

A primary effect of exposure to high levels of radio-frequency radiation (RFR) isan increase in body temperature. Although temperature gradients normally exist in the mammalian body in studies of environmental heating, core to skin thermal gradients are often assumed to be minimal. During RFR exposures, however, particularly at high frequencies, relatively large thermal gradients may occur. Absorption patterns of RFR are often complex and depend on variable experimental parameters, such as carrier frequency, distance from the RFR source, and orientation of the animal with respect to the field. For example, the depth of penetration of RFR energy is greater at lower frequencies. At higher frequencies, surface heating occurs more quickly than internal heating and larger thermal gradients exist within the animal. On the other hand, RFR at certain frequencies penetrates deeply and directly heats internal sites in the body. Localized hot spots may also occur.