Unknown authors · 2003
The study investigated electrosensibility in 708 adults aged 17 to 60 years using perception thresholds to 50 Hz electric currents. Analysis of perception threshold distributions revealed a subgroup with significantly increased electrosensibility that could be differentiated from the general population. The variation in electrosensibility was significantly larger than estimated by nonionizing radiation protection bodies but much smaller than claimed by hypersensitivity self-aid groups. The investigation method presented is capable of exclusion diagnostics for persons suffering from the hypersensitivity syndrome.
D'Costa H et al. · 2003
Researchers recorded EEG from ten awake subjects while a mobile phone behind the head emitted radiofrequency fields. The study tested a GSM phone at full radiated power and a phone in active standby mode, each with five active and five sham exposures in randomized five-minute intervals. The experiment was single-blind and compared average EEG band power between active and sham recordings. Statistical tests showed significant differences in the full-power trial for EEG alpha (8-13 Hz) and beta (13-32 Hz) bands. Analysis of median spectral power across 32 discrete frequencies found significant differences in 7 frequencies overall.
McNamee, J. · 2003
Unknown authors · 2003
Researchers exposed cultured fibroblasts from six healthy donors of different ages to intermittent ELF-EMF at 50 Hz and 1 mT for 1 to 24 hours. Basal DNA strand break levels correlated with donor age. The maximum DNA strand break response occurred at 15 to 19 hours of exposure. This response was more pronounced in cells from older donors, suggesting an age-related decrease in DNA repair efficiency.
Unknown authors · 2003
Unknown authors · 2003
Researchers exposed human immune cells to 60 Hz electromagnetic fields (like power lines) along with a known cancer-causing chemical called benzo(a)pyrene. They found that EMF exposure significantly increased genetic damage when combined with the chemical, compared to the chemical alone. The study suggests EMF may act as an amplifier of cancer-causing processes rather than directly causing cancer itself.
Unknown authors · 2003
Researchers studied 15 men chronically exposed to 50-Hz magnetic fields for 1–20 years and 15 unexposed controls. Exposure levels for the exposed group ranged from 0.1 to 2.6 μT weekly geometric mean. Blood samples were taken hourly from 2000 to 0800 and nighttime urine was also collected and analyzed. The study found no changes in plasma melatonin, urinary 6-sulfatoxymelatonin, or circadian rhythm in the exposed group.
Unknown authors · 2003
Researchers studied 15 men exposed to 50-Hz magnetic fields at work and home for 1-20 years, measuring their melatonin levels around the clock. Despite chronic exposure to fields up to 2.6 microTesla, the workers showed no changes in melatonin production or sleep hormone rhythms compared to unexposed controls. The findings challenge the theory that magnetic fields disrupt melatonin and cause health problems.
Unknown authors · 2003
Residential magnetic field exposure was calculated as a time-weighted average from 1967 until diagnosis using distance, line configuration, and current load, while occupational exposure was classified by an expert panel into three levels based on hours per week above background. The two highest residential exposure categories showed increased odds ratios for women (2.01 and 2.68) but not for men (1.70 and 1.37), and occupational exposure showed no significant association.
Unknown authors · 2003
This nested case-control study tested whether exposure to electromagnetic fields from high-voltage power lines increases hematological cancer incidence in adults. Residential time-weighted average magnetic fields were calculated from 1967 until diagnosis using cut-off points at 0.05 and 0.20 microT. The two highest residential exposure categories showed non-significant elevated odds ratios for all leukemia combined (OR 1.3, 95% CI 0.7-2.5 and OR 1.5, 95% CI 0.8-3.0). The increased risk was confined to chronic lymphocytic leukemia, acute lymphocytic and acute myeloid leukemia. Occupational exposure showed no significant association for any cancer site.
Monfrecola G, Moffa G, Procaccini EM. · 2003
The study assessed the effects of non-ionizing electromagnetic radiation emitted by CFs on cutaneous blood flow in 30 healthy volunteers aged 18 to 53 years. Cutaneous blood flow was measured on the ear skin with a laser Doppler He-Ne flowmeter under controlled temperature and humidity. Microflow was recorded across phases T0 through T6, including no CF contact, CF off touching the ear, CF on, CF on and receiving, then back through CF on, CF off, and no contact. During phases T1 to T5 microflow increased by 61.38% to 157.67% relative to baseline, and all these phases showed statistically significant elevations compared with baseline.
Aweda MA, Gbenebitse S, Meidinyo RO · 2003
Researchers studied the effects of 2.45 GHz microwave exposure on the lipid peroxidation status of 120 Wistar rats at a power density of 6 mWcm(-2). Lipid peroxidation status in the rats was monitored for 8 weeks after irradiation using the thiobarbituric acid method. Microwave exposure raised the lipid peroxidation status from a mean control value of 4.18 x 10(-6)g 1(-1) to a maximum of 6.50 x 10(-6) g 1(-1) within the first 24 hours, after which it gradually returned toward the control value. The results demonstrated that microwave exposures cause a significant increase in lipid peroxidation status and that ascorbic acid and alpha-tocopherol had protective effects.
Aweda MA, Gbenebitse S, Meidinyo RO. · 2003
Researchers exposed rats to 2.45 GHz microwave radiation (WiFi frequency) and found it increased cellular damage by 56% within 24 hours. Vitamins C and E provided significant protection when given beforehand, suggesting antioxidants may help reduce microwave-induced oxidative stress in living tissue.
Aweda MA, Gbenebitse S, Meidinyo RO · 2003
Researchers exposed 120 rats to 2.45 GHz microwave radiation (the same frequency as microwave ovens) and found it significantly increased harmful oxidative stress in their bodies. However, giving the rats antioxidants like vitamin C and vitamin E before exposure provided substantial protection against this cellular damage.
Unknown authors · 2003
Researchers isolated pineal glands from Wistar rats at 10:00 h and exposed them to a 50 Hz, 1 mT magnetic field for 4 hours in vitro. Basal melatonin release and enzyme activities were unchanged by magnetic field exposure alone. When magnetic field exposure preceded norepinephrine addition by 30 minutes, NAT activity, HIOMT activity, and melatonin release increased significantly. This effect did not occur when magnetic field and norepinephrine were applied together or in sonicated glands.
Unknown authors · 2003
Researchers exposed rat pineal glands to 50 Hz magnetic fields (the same frequency as power lines) and found the fields enhanced melatonin production when combined with norepinephrine stimulation. The magnetic fields didn't directly affect the melatonin-producing enzymes but instead altered the cellular signaling pathway that controls melatonin release.
Zhang MB, Jin LF, He JL, Hu J, Zheng W. · 2003
The study aimed to investigate the combined DNA-damaging effects of low-intensity 2,450 MHz microwave radiation with three chemical mutagens on human lymphocyte DNA. Microwave exposure alone did not significantly increase comet tail length compared with controls at 0 h or 21 h incubation. When lymphocytes were incubated with 30.00 micro mol/L or 3.00 micro mol/L MMC, microwave exposure significantly increased comet tail lengths compared with MMC alone. Combinations of microwave with BLM or MMS did not produce significantly greater DNA damage than BLM or MMS alone.
McNamee et al. · 2003
Researchers examined the effect of 24-hour continuous-wave and pulsed-wave 1.9 GHz radiofrequency fields on primary DNA damage and micronucleus induction in human leukocyte cultures. No significant differences in primary DNA damage were observed between sham controls and any exposed cultures when assessed by the alkaline comet assay immediately after exposure. Similarly, no significant differences were found in micronucleus incidence, micronucleated binucleated cells, binucleated cell frequency, or proliferation index between sham and exposed cultures.
McNamee et al. · 2003
Researchers exposed human white blood cells to 1.9 GHz radiofrequency radiation (similar to what cell phones emit) for 24 hours at power levels up to 10 watts per kilogram. They found no DNA damage or genetic changes in the cells, even after this extended exposure period at levels much higher than typical phone use.
Unknown authors · 2003
Higuchi Y et al. · 2002
Researchers performed a left-sided hemilaminectomy in adult Sprague-Dawley rats to expose the C6 dorsal root ganglion. Rats received pulsed radiofrequency, continuous radiofrequency, or sham treatment with the electrode on the ganglion for 120 seconds. Pulsed radiofrequency significantly increased cFOS-immunoreactive neurons in the superficial dorsal horn laminae three hours after treatment, while continuous radiofrequency did not. The authors concluded that pulsed radiofrequency activates pain-processing neurons in the dorsal horn without tissue heating.
Tice RR, Hook GG, Donner M, McRee DI, Guy AW. · 2002
DNA damage in leukocytes was assessed with the alkaline comet assay and chromosomal damage in lymphocytes with the micronucleus assay. No significant increase in DNA damage was seen after 3 or 24 hours, and no increase in micronucleated lymphocytes occurred after 3 hours. However, 24-hour exposures at 5.0 or 10.0 W/kg significantly increased micronucleated lymphocytes about fourfold, regardless of signal type, modulation, or frequency.
Unknown authors · 2002
Human diploid fibroblasts were exposed to continuous or intermittent ELF-EMF at 50 Hz, sinusoidal, for 24 hours at 1000 microT. The alkaline and neutral comet assays were used to evaluate DNA single-strand and double-strand breaks. Intermittent fields reproducibly resulted in a significant increase of DNA strand break levels, mainly DSBs, compared to non-exposed controls. The highest DNA strand break levels occurred with 5 minutes field-on and 10 minutes field-off intermittence.
Unknown authors · 2002
Austrian researchers exposed human skin cells to 50 Hz electromagnetic fields (like power lines) for 24 hours and found that intermittent exposure caused significant DNA strand breaks, while continuous exposure did not. The study revealed that pulsed EMF exposure was more damaging than steady exposure, with the worst damage occurring during 5-minute on/10-minute off cycles.
Burch JB et al. · 2002
Researchers evaluated cellular telephone use and melatonin metabolite excretion in two groups of male electric utility workers. Participants collected urine samples and recorded telephone use over three workdays while personal magnetic field and light exposures were measured. In Study 1, no change in 6-OHMS excretion was observed with daily cellular telephone use over 25 minutes.
