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【Share】Laptop Exposure Associated With Nonthermal Effect on Sperm Quality
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Exposure to laptop computers might adversely affect male fertility by inducing DNA fragmentation and decreasing progressive motility, according to research presented here at the American Society for Reproductive Medicine 66th Annual Meeting. In the first study of its kind to evaluate the effect of laptop computers receiving wireless Internet signals on human spermatozoa, researchers evaluated semen samples from 15 men. The samples were separated into 2 incubation groups: one that was exposed to a laptop computer receiving a WiFi signal for 4 hours, and another that was not. Despite the fact that the 2 groups were kept at a controlled temperature (25 °C) to rule out thermal effects, the results showed significant DNA damage and decreased sperm motility in the laptop-exposed group. "We controlled and fixed the temperature to avoid thermal effects," said Conrado Avendano, PhD, lead author of the study and director of research at the Nascentis Reproductive Medical Center in Cordoba, Argentina. Prior to incubation, the sperm was assessed for parameters such as concentration, motility, morphology, and vitality. Evaluation after incubation showed decreased sperm motility in the laptop-exposed group (73.5 ± 8.2 vs 63.6 ± 7.3; P < .05), increased sperm immotility (18.8 ± 6.9 vs 28.3 ± 7.3; P < .05), and an increase in sperm DNA fragmentation (6.3 ± 8.1 vs 13.1 ± 9.2; P < .05), compared with the nonexposed group. Previous studies looking at the effects of cell phones have shown that the devices can reduce semen quality, and laptop studies have looked at the thermal effects of laptop computers; however, this is the first study to show the effect of exposure to a laptop computer and to radio frequency electromagnetic waves from its WiFi signal on sperm quality in an in vitro model. The study's limitations include its small size and the fact that it was an in vitro study. Dr. Avendano said that future research will probe the possible mechanisms behind the effect. In the meantime, he said, the preliminary findings represent a red flag in regard to laptop use. "This is a very interesting but very preliminary study. The effect of laptops on real people's testis is still unknown, and this study does not shed light on this," he said. "However, the study does provide hints as to what might be happening, and [points us toward] the kinds of studies in humans that would answer the question about the effect of laptops on male fertility," Dr. Jarvi said. |
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5楼2011-02-17 09:31:11
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