Microwave Radiation and Heat-Beat Rate of Rabbits

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Abstract
Each of three adult New Zealand rabbits, 2 male and 1 female albinos, was exposed dorsally or vaurally, to 2450-MHz plane waves for 20 min under each of several field conditions: 1) to continuous waves (CW) at 5 m W/cm1; 2) to pulsed waves (PW) of 1-µs width that recurred 700 pps at an average of 5 m W/cm2 and at a peak of 7.1 W/cm2; 2) to PW of 10-µs width at a peak of 13.7 W/cm2 that were synchronized with and triggered by the R wave of the electro-cardiogram (EKG) ai various delay times (0, 100, and 200 ms; and 4) to CW at 80 m W/cm1. Carbon-loaded Teflon electrodes were used to record the. EKG from forelimbs of an animal before, during, and after irradiation whilst it was maintained in a constant exposure geometry in a wooden squeeze box. Field induced changes in the heart-beat rate were observed at SO mW/cnr but not ai lower average power densities, although a weak positive chronotropic effec might have been occasioned by PW introduced at 100 and 200 ms after the R wave peak. No cumulative effect was observed over a period of four months. Thermographic analysis revealed relatively little absorption of microwave energy by the myocardium irrespective of anatomical aspect of exposure.

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