Unknown authors · 2011
Researchers analyzed singleton live births and stillbirths in metropolitan areas of Québec from 1998 to 2007, calculating residential distance to power transmission lines. They used generalized estimating equations to compute odds ratios for stillbirth across distance categories, accounting for individual and area factors. No association was found between distance and preterm stillbirth. Term stillbirth odds were higher for residences within 25 meters compared to 100 meters or more (OR 2.25, 95% CI 1.14 to 4.45), but no dose-response pattern appeared.
Unknown authors · 2011
Researchers conducted a meta-analysis using primary data from 1980 to 2010 across 9 studies on electric and magnetic field exposure and acute myeloid leukemia in adults. The overall estimated odds ratio was 1.24 with a 95 percent confidence interval of 1.11 to 1.37. For exposure levels of 0.1 to 0.2 microtesla and 0.2 microtesla or higher compared with less than 0.1 microtesla, the odds ratios were 1.17 and 1.51 respectively.
Unknown authors · 2011
The study used a prospective cohort design in which 626 children were followed for up to 13 years and their mothers carried meters to measure magnetic field levels during pregnancy. After adjusting for confounders, each 1-milligauss increase in maternal magnetic field level during pregnancy was associated with a 15% higher asthma rate in offspring (adjusted hazard ratio 1.15, 95% CI 1.04-1.27). When magnetic field levels were categorized, children of mothers with high exposure (>2.0 mG) had a 3.5-fold higher asthma rate compared to those with low exposure (≤0.3 mG), while medium exposure (>0.3-2.0 mG) was associated with a 74% higher rate. A statistically significant synergistic interaction was found between magnetic field exposure and maternal history of asthma and firstborn birth order.
Unknown authors · 2011
Researchers conducted a case-control study of 162 children with acute lymphocytic leukemia and 565 matched controls in São Paulo, Brazil. Exposure to extremely low frequency magnetic fields was assessed by measurements inside homes and distance to power lines. For 24-hour bedroom measurements, magnetic fields of 0.3 microtesla or higher showed no increased leukemia risk compared to levels below 0.1 microtesla (OR 1.09, 95% CI 0.33-3.61). Nighttime measurements gave an odds ratio of 1.52 (95% CI 0.46-5.01), while living within 200 meters of power lines gave an odds ratio of 1.67 (95% CI 0.49-5.75) and within 50 meters an odds ratio of 3.57 (95% CI 0.41-31.44).
Unknown authors · 2011
Researchers measured extremely low frequency magnetic fields (ELF-MF) in 39 apartments across 18 Swiss buildings that contained transformer stations. Apartments fully adjacent to a transformer room had an arithmetic mean ELF-MF of 0.59 μT, while those only partly touching the transformer room averaged 0.14 μT, and the remaining apartments averaged 0.10 μT. The researchers concluded that apartment location relative to the transformer room could reduce the effort of exposure assessment and may help eliminate selection bias in future epidemiologic studies.
Reid A et al · 2011
Researchers conducted an Australian case–control study of acute lymphoblastic leukaemia in children aged under 15 years and asked parents about tasks they undertook in each job. Exposure variables were created for any occupational exposure before the birth of the child, in jobs 2 years before birth, in jobs 1 year before birth and up to 1 year after birth. There was no association between maternal (odds ratio (OR)=0.96; 95% CI=0.74–1.25) or paternal (OR=0.78; 95% CI=0.56–1.09) exposure to ELF any time before the birth and risk of childhood ALL.
Unknown authors · 2011
The review addressed an ongoing scientific controversy about whether the association between residential ELF-MF exposure and childhood leukemia is causal or due to methodological shortcomings. Recent pooled analyses confirmed an approximately two-fold risk increase for childhood leukemia at exposures ≥0.4 μT and showed consistency across countries and methods. For childhood brain tumours, recent pooled analyses show little evidence of an association with ELF-MF, even at exposures ≥0.4 μT. The assessment that ELF-MF are a possible carcinogen and may cause childhood leukemia remains valid.
Unknown authors · 2011
Unknown authors · 2011
Unknown authors · 2011
Over eight years, the VINČA Institute performed spot broadband measurements of ELF and RF fields in over 35 Serbian municipalities. The study was motivated by public requests for information about exposure levels in living spaces. Measured values in households under overhead power lines were far below the recommended safe levels.
Unknown authors · 2011
The Health Council of the Netherlands examined whether exposure limits should shift from specific absorption rate to a maximum allowable temperature increase. The council evaluated this change across six criteria including consistency, applicability, and causality. The council concluded that changing the dosimetric quantity would not advance the debate on non-thermal effects from long-duration, low-intensity exposure. The council recommended keeping the current system of basic restrictions and reference levels expressed as SAR and in V/m or µT.
Unknown authors · 2011
The comment appeared in the International Journal of Epidemiology in August 2011. It addresses social and economic patterning in the Interphone study. The comment references earlier Interphone study publications from June and August 2010.
Unknown authors · 2011
Researchers exposed two human cancer cell lines to a 2.2 GHz pulse-modulated radar-like signal for 24 hours at an average SAR of 0.023 W/kg. The exposure was subthermal with a temperature rise below 0.1 °C. NB69 neuroblastoma cells showed a 13.5% reduction in cell number and increases in G0/G1 and G2/M phase proportions, while HepG2 hepatocarcinoma cells did not respond.
Unknown authors · 2011
Researchers examined trends in newly diagnosed brain cancer cases in England between 1998 and 2007. No overall time trends in brain cancer incidence were observed for either gender or any age group. Small increases in temporal lobe cancer rates were seen in men and women, while rates for parietal lobe, cerebrum, and cerebellum cancers decreased in men.
Unknown authors · 2011
In part B, mice were transplanted intraperitoneally with ascites (Ehrlich-Lettre ascites, strain E) carcinoma cells and then exposed to 112 MHz amplitude-modulated radiation at 16 Hz and 2.45 GHz radiation separately for 14 days. No tumor development occurred in mice exposed to radiofrequency or microwave radiation after a single topical dose of DMBA. Mice transplanted with Ehrlich-Lettre ascites carcinoma cells and exposed to the fields showed a slight but insignificant increase in cell numbers compared to controls.
Unknown authors · 2011
The commentary states the Interphone Study used a case-control design with recall of past exposures that had substantial inaccuracy. It also notes the study had low participation rates. The author questions the wisdom of this design choice. The commentary argues funding should have been used for a large-scale cohort study that could examine endpoints beyond cancer.
Unknown authors · 2011
The study found no effect on the hematopoietic system in rats exposed to 900 MHz CW RF at 2 W/kg SAR. The exposure level was the ICNIRP public exposure limit for localized SAR.
Unknown authors · 2011
The authors reviewed published reports on DNA responses to electromagnetic fields across different frequency ranges and characterized DNA's properties as an antenna. They examined reports of increased stress protein levels and DNA strand breaks from EMF interactions, both indicating DNA damage. EMF interactions with DNA were found to be similar across non-ionising frequencies including extremely low frequency and radio frequency ranges. DNA was concluded to possess the structural characteristics of fractal antennas: electronic conduction and self symmetry.
Unknown authors · 2011
The random sample consisted of 34 people who were supplied with a personal exposure meter for seven consecutive days and kept a time-location-activity diary. A total of 225,414 electric field strength measurements were recorded in 12 different RF bands. Summary statistics were calculated with the robust regression on order statistics method. The study found evidence for statistically significant variability of individual RF exposure across days of the week, though the relative magnitude of the differences observed was small. Larger studies are needed to validate these results and determine whether day of the week is an important determinant for inclusion in individual RF exposure prediction models.
Unknown authors · 2011
This review updated a previous systematic review on the association between radiofrequency electromagnetic field (RF-EMF) exposure and health-related quality of life that included studies published before August 2007. Nine randomized trials addressed short-term close-to-body RF-EMF exposures such as mobile phones, and six randomized trials addressed short-term far-field exposure from base stations, while eight studies evaluated environmental far-field RF-EMF exposure. In most of the randomized trials, no exposure-response association was observed. Similarly, most of the recent observational studies did not show associations between RF-EMF exposure and non-specific symptoms.
Unknown authors · 2011
Typical general public exposures around mobile radio service base stations consume only tiny fractions of exposure levels. Mobile phones cause higher exposures to the user than base stations. Both base stations and mobile phones apply power control mechanisms that can significantly reduce transmit power and exposure.
Unknown authors · 2011
Researchers exposed cultured human dermal papilla cells to 1,763 MHz RF radiation at a specific absorption rate of 10 W/kg. IGF-1 mRNA expression was significantly induced, leading to increased BCL-2 and CCND1 proteins and increased phosphorylation of MAPK1. Exposure for 1 hour per day over 7 days significantly enhanced hair shaft elongation in ex vivo hair organ cultures. In follicular matrix keratinocytes, Ki-67 expression increased and TUNEL signaling decreased. The authors suggest that 1,763 MHz RF exposure stimulates hair growth in vitro through IGF-1 induction in dermal papilla cells.
Unknown authors · 2011
The document lists high priority and other research needs for health effects research. The research needs are subdivided into epidemiology, human studies, animal studies, cellular studies and mechanisms, and social science research.
Unknown authors · 2011
Unknown authors · 2011
