Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Exposure of Frog Hearts to CW or Amplitude-Modulated VHF Fields: Selective Efflux to Calcium Ions at 16 Hz.
Author Schwartz, J. L. ; House, D. E. ; Mealing, G. A. R. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC. ;National Research Council of Canada, Ottawa (Ontario).
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/416;
Stock Number PB91-171710
Additional Subjects Electromagnetic radiation ; Calcium ; Biological transport ; Heart ; Rana catesbeiana ; Frequency ; Nerve tissue ; Statistical analysis ; Radiation dose-response relationship ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB91-171710 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/04/1991
Collation 12p
The effects of continuous and amplitude-modulated radiofrequency electromagnetic waves on calcium efflux from 45 Ca preloaded frog hearts were examined. Frog hearts, electrically stimulated at their natural beating frequency, were exposed for 30 min to 240 MHz radiowaves in a Crawford irradiation cell. Exposures at incident power levels of 0.5, 0.8, 1.0, 1.2, 5.0 and 10.0 Watts (corresponding to calculated specific absorption rates (SAR) of 0.15, 0.24, 0.30, 0.36, 1.50, and 3.00 mW/kg) were tested either in the continuous wave mode or using sinusoidal amplitude modulation at 0.5 Hz, the average beating frequency of the frog hearts, or at 16 Hz. Continuous at 0.5 Hz amplitude-modulated waves did not affect calcium efflux from the hearts. However, 16 Hz amplitude-modulated electromagnetic radiation resulted in statistically significant increases in calcium efflux. The effect was most significant at the 1 W incident power level (17.9%, p<0.01) but was also observed at 0.5 W(21.0%, p<0.05). Therefore, it appears that frog hearts are affected by electromagnetic radiation at particular power levels and 16 Hz modulation frequency, a bioelectromagnetic interaction displaying power and frequency windows comparable to those reported by other investigators in calcium efflux studies on neural tissue.