Browse 6,486 peer-reviewed studies on electromagnetic field health effects from 4 research libraries.
Showing 430 studies in Cardiovascular
Thuroczy G, Kubinyi G, Bodo M, Bakos J, Szabo LD, · 1994
At 30 mW/cm², total EEG power increased, while at 10 mW/cm² EEG did not change but cerebral blood flow increased. Brain-localized 4 GHz continuous-wave exposure at 42 mW/g SAR increased EEG delta power and REG amplitude simultaneously.
Schwartz JL, Mealing GA · 1993
Researchers investigated the effects of AM or CW modulated 1 GHz exposure on calcium efflux and contractile force of isolated atrial muscle stripes of frog heart in vitro. Calcium efflux from electrically stimulated, 45Ca(2+)-preloaded atrial strips of the frog heart was measured from perfusate samples collected at 2-min intervals for 32 min while contractile force was simultaneously monitored. The atrial strips were exposed for 32 min to constant or amplitude-modulated 1 GHz fields at SAR ranging from 3.2 microW/kg to 1.6 W/kg with modulation at 0.5 Hz or 16 Hz. Neither unmodulated nor 0.5 Hz or 16 Hz modulated 1 GHz waves affected the movement of calcium ions or the contractile force in isolated atrial strips of the frog heart.
Podkovkin VG · 1993
Researchers repeatedly exposed guinea pigs to microwave radiation at 1 mW/cm². This exposure inhibited anaphylactic response in some animals and increased blood levels of histamine, epinephrine, and norepinephrine. The increases were more pronounced in irradiated guinea pigs that died from anaphylactic shock compared with nonirradiated animals. Long-term stay in a perturbed weak geometric field reduced the microwave-induced effect.
Goldoni J, Durek M, Koren Z · 1993
Researchers examined two groups of workers occupationally exposed to microwaves and radiofrequency radiation and compared them with a control group. One group consisted of 49 radar operators from Zagreb Air Traffic Control who were examined twice over 18 months, and the other group comprised 46 workers at radio relay stations. A follow-up study found significant changes in haematological and biochemical parameters, electrical brain activity, and capillaroscopic and ophthalmological findings in the radar operators, and a cross-sectional analysis showed the highest rate of changes in general health status for that group.
Seaman RL, DeHaan RL · 1993
Researchers studied inter-beat intervals of aggregated cardiac cells from chicken embryos during 190-second exposures to 2.45 GHz microwaves. The inter-beat interval decreased during exposures at 42.0 W/kg and higher with continuous-wave or square-wave modulation, consistent with thermal effects. Increases occurred during continuous-wave exposures at 1.2-12.2 W/kg and decreases after pulse-modulated exposures at 8.4-12.2 W/kg, which were not consistent with simple thermal effects.
Schwartz JL, House DE, Mealing GA · 1990
R.P. Liburdy, A. Penn · 1984
Researchers exposed rabbit erythrocytes to 2450 MHz continuous-wave microwaves at 60 mW/g and used sham exposures with the waveguide unenergized. Sodium-22 influx increased by 75-100% only at the membrane phase transition temperature of 17.7-19.5 °C. The permeability increase was amplified at intracellular oxygen tension (0-5 mm Hg) and at hyperoxic conditions (760 mm Hg), but was least pronounced at arterial and atmospheric oxygen tension. Microwave exposure at the phase transition temperature caused shedding of at least 11 proteins under 28,000 D, including two unique bands at 26,000 and 24,000 D. Approximately 450 fg of protein were estimated to be released per erythrocyte.
Unknown authors · 1982
Researchers followed two men for 12 months after they were accidentally and acutely irradiated with X-band microwave radiation. Both men developed similar psychological symptoms including emotional lability, irritability, headaches, and insomnia. Several months later hypertension was diagnosed in both patients with no organic basis found for the psychological problems and no secondary cause for the hypertension.
Michael Ciano et al. · 1981
D.I. McRee, R. Faith, E.E. McConnell, A.W. Guy · 1980
A.W. Guy, P.O. Kramar, C.A. Harris, C.K. Chou · 1980
Researchers exposed four rabbits to 2450-MHz CW microwave radiation at 10-m W/cm² for 23 h per day for 180 days, while four control rabbits were sham-exposed. Periodic eye examinations and monitoring of body mass, urinary output, rectal temperature, hematocrit, hemoglobin, white cell count with differential, platelet count, and blood coagulation revealed no significant differences except a decrease in eosinophil percentage. Additional analyses at the National Institute of Environmental Health Sciences found significant decreases in albumin, calcium, and albumin/total globulin ratio, and a significant increase in myeloid/erythroid ratio in bone marrow of exposed rabbits.
R. B. Olcerst et al. · 1980
Without radiation, both ions showed four linear regions in Arrhenius plots with transitions at 8-13°C, 22.5°C, and 36°C. Microwave exposure increased efflux only at these transition temperatures, and at 22.5°C the efflux was significantly greater than a thermal prediction at all three absorption rates but did not rise monotonically with power.
René Males · 1979
M.J. Galvin, M. Lieberman and D.L. McKee · 1979
Researchers exposed Japanese quail embryos to 2.45 GHz microwaves at 5 mW/cm2 or 20 mW/cm2 for the first 8 days of development. Neither exposure level caused changes in embryonic heart morphology or myocardial ultrastructure. Lactate dehydrogenase and glutamic-oxaloacetic transaminase activities did not differ from controls. Creatine phosphokinase activity was lower at 20 mW/cm2 compared to control, but unchanged at 5 mW/cm2.
A. Ripamonti, R.B. Frankel, E.M. Ettienne · 1979
Researchers isolated sarcoplasmic reticulum vesicles from 10-14 day old chicks and exposed the microsomes to a 0.7 tesla magnetic field at 4°C for up to 60 minutes before adding them to a reaction mixture. After 30 minutes of exposure, calcium uptake rates rose from 800 to 6000 nanomoles per milligram per minute and total calcium sequestered rose from 175 to 350 nanomoles per milligram. Phosphate release from ATP hydrolysis fell from 6.0 to 3.5 nanomoles per milligram per minute over the same period.
James C. Lin, John C. Nelson, Merlin E. Ekstrom · 1979
Researchers exposed C3H mice to 148 MHz RF energy at 0.5 mW/cm2 for one hour a day, five days a week, for 10 weeks starting shortly after birth. They monitored body weight daily for ten weeks then weekly, drew blood at multiple ages for analysis, and performed necropsy with histopathology on randomly selected animals. No effects were found on blood cells, body mass, or lesion incidence, onset, prevalence, extent, or type compared to sham controls.
Kenneth Exworthy · 1979
Jana Pazderová-Vejlupková, Marcel Josífko · 1979
Alkaline phosphatase activity in neutrophils rose significantly in the first week of irradiation and fell transiently after irradiation ceased. In the post-irradiation interval, exposed rats displayed a significant decline in rate of body weight increase.
Clark W. Heath et al. · 1978
Unknown authors · 1978
Evoked potentials measured inside and outside the magnet were essentially the same, and the latency of fast and slow waves from limb to brain was not changed by the magnetic field. Heart rate was lower inside the magnet, while blood pressure results showed opposite directions in the two monkeys. Noticeable changes in blood hematology and chemistry can be attributed to the trauma caused by the implantation of the cortical electrodes. From the tests which were performed, as described above, we conclude that there were no observable effects in the two monkeys.
M. O'Donnell, J. W. Mimbs, B. E. Sobel, J. G. Miller · 1977
D. R. McNiven, D. J. Wyper · 1976
Microwave therapy produced a highly significant increase in muscle blood flow in all subjects, raising the mean from 2.9 ml/100g/min at rest to 11.4 ml/100g/min at the end of application. Short wave diathermy, infra red irradiation, pulsed electromagnetic therapy, ice and massage produced no significant effect on muscle blood flow. No significant correlation was found between athletic fitness and blood flow or between resting blood flow and the time delay before the increase, which varied from 5 to 12 minutes.
Dave Vanas · 1976
Elmqvist H · 1976
The paper describes interference mechanisms, the most common sources of external electromagnetic interference, and their influence on different types of pacemakers. It identifies three ways external electromagnetic interference can influence pacemaker function. Remote sources include microwave ovens, radar installations, and radio-transmitters, while direct contact sources include defibrillation, diathermy, short-wave treatment equipment, and household appliances with poor insulation. A survey of over 2200 patients found only 10 cases of interference with no serious consequences. Modern pacemakers use an interference filter that discriminates signals by repetition rate and a metal encapsulation that reduces microwave effects.
McRee DI · 1976