Grazie alla collaborazione
del dottor Ernesto Burgio di Palermo, ecco alcuni studi che fanno riferimento al
rapporto tra infertilità maschile e campi elettromagnetici.
Effects of extremely low frequency magnetic field on fertility of adult male and female rats.
Al-Akhras MA, Elbetieha A, Hasan MK, Al-Omari I, Darmani H, Albiss B.
Biophysics Laboratory, Department of Physics, Jordan University of Science & Technology, Irbid, Jordan. email@example.com
Bioelectromagnetics. 2001 Jul;22(5):340-4
To investigate the effects of an extremely low-frequency (ELF) magnetic field on their fertility, adult male and female Sprague-Dawley rats were exposed to a 50 Hz sinusoidal magnetic field of approximately 25 microT (rms) for 90 days before they were mated with unexposed counterparts. Exposure to a 50 Hz field reduced male rat fertility. The number of pregnant females was reduced when mated with exposed males, and the number of resorptions increased. The effects of magnetic field on male fertility were shown to be partly reversible, when the same exposed group of males were remated 45 and 90 days after being removed from the fields. Exposure of adult female rats to 50 Hz magnetic fields for 90 days before mating significantly reduced their fertility. The mean numbers of implantations and living fetuses per litter were statistically significantly decreased in the 50 Hz group. These results suggest that low frequency magnetic fields have some adverse effects on fertility of male and female rats.
Copyright 2001 Wiley-Liss, Inc.
Development of mouse testis and epididymis following intrauterine exposure to a static magnetic field.
Tablado L, Soler C, Nunez M, Nunez J, Perez-Sanchez F.
Departament de Biologia Animal, Facultat de Ciencies Biologiques, Universitat de Valencia, Burjassot, Spain.
Bioelectromag 21:19-24 (2000).
In order to test if the in utero exposure to static magnetic fields affects testis and epididymis development in mice, females were exposed to 0.5-0.7 T, generated by a permanent magnet, from day 7 of gestation to the day of birth. No significant differences were found between exposed and sham-exposed animals with respect to body weight gain of dam during the gestational period, litter size, body weight of male pups at the day of birth, and body or testis-epididymis weight gain of pups from birth to day 35. Histopathologic evaluation of testis and epididymis of pups of 1, 5, 15, and 35 days of age showed no detectable alterations due to in utero exposure to static magnetic fields.
Effects of a 1.5-Tesla static magnetic field on spermatogenesis and embryogenesis in mice.
Narra VR, Howell RW, Goddu SM, Rao DV.
Invest Radiol 31:586-590, 1996
Department of Radiology, UMDNJ-New Jersey Medical School, Newark 07103, USA.
RATIONALE AND OBJECTIVES: There is a trend toward the use of higher magnetic field strengths in magnetic resonance imaging procedures. Considering this trend and the lack of consensus on the biologic effects of static magnetic fields, it is of considerable interest to examine the biologic effects of a 1.5-tesla (T) static magnetic field on spermatogenesis and embryogenesis in mice. METHODS: Male and pregnant female Swiss Webster mice were exposed to a 1.5-T static magnetic field for 30 minutes. Effects on spermatogenesis in male mice were investigated by counting testicular spermheads and epididymal spermhead shape-abnormalities as a function of time after exposure. Pregnant female mice were exposed to the field at the two-cell embryo stage, sacrificed immediately, and the ability of these preimplantation embryos to mature into blastocysts was examined in vitro. RESULTS: Exposure to the static 1.5-T magnetic field caused a statistically significant reduction (15%) in testicular sperm on the 16th and 29th days after exposure. However, the increase in spermhead shape abnormalities above normal control values was minimal. A substantial effect was noted on the development of preimplantation embryos with a survival fraction of 0.56 compared with controls. CONCLUSIONS: A 30-minute exposure to a 1.5-T static magnetic field appears to cause some deleterious effects on spermatogenesis and embryogenesis in mice.
Is sperm motility maturation affected by static magnetic fields?
Tablado L, Perez-Sanchez F, Soler C.
Department of Animal Biology, University of Valencia, Burjassot, Spain
Environ Health Perspect 104:1212-1216, 1996.
Kinematic parameters were evaluated in mouse epididymal extracts to monitor maturation of sperm movement in animals exposed to static magnetic fields using the Sperm-Class Analyzer computerized image analysis system. For this purpose, animals were exposed to a field of 0.7 T generated by a permanent magnet over 10 or 35 days for either 1 or 24 hr/day. The values of the motion endpoints were similar in animals used as controls and in those exposed to the nonionizing radiation, whatever the period of exposure or daily dosage. Changes in motility were observed in all groups: the percentage of total motile and progressive motile spermatozoa increased during passage through the epididymis, with major changes between the caput and corpus epididymides, and the pattern of swimming changed clearly towards more rapid and straighter trajectories. The processes of initiation of sperm motility and maturation of displacement patterns were not then affected by magnetic treatment. Moreover, it appears that sperm production is unaffected because no changes were observed in testicular or epididymal weights after exposure to static magnetic fields.
Effects of static and time-varying (50-Hz) magnetic fields on reproduction and fetal development in rats.
Mevissen M, Buntenkotter S, Loscher W.
Department of Pharmacology, Toxicology, and Pharmacy, School of Veterinary Medicine, Hannover, Germany.
Teratology 50:229-237, 1994
Mated Wistar rats were chronically exposed to a static magnetic field (MF) from day 1 to day 20 of pregnancy. Flux density of the MF was 30 mTesla (mT), i.e., within the range of exposures of operators of magnetic resonance imaging (MRI) devices. For comparison with effects of this static field, a time-varying (50-Hz) MF of the same flux density was used. In both experiments, i.e., static or 50-Hz MF exposure, sham-exposed groups of dams served as controls. On day 20, the dams were sacrificed for reproductive and teratological assessment. The litters were evaluated for numbers of implantations, fetal deaths and resorptions, gross external, visceral, and skeletal malformations, and fetal weights. No adverse effects were seen in the dams during MF exposure. The mean number of living fetuses per litter was significantly decreased in the group with static MF exposure, but not the group with 50-Hz MF exposure. Further differences between the two types of field exposure were observed with respect to minor (skeletal) fetal anomalies which were increased in the 50-Hz but not the static MF group. No serious malformations were seen in any group. In both MF-exposed groups, increased skeletal ossification was found, possibly indicating an accelerated prenatal development. In a second experiment with static MF (30 mT) in which dams were exposed for the whole period of pregnancy, and postnatal growth and development of offspring were studied,
JA Evans et al: Infertility and pregnancy outcome among magnetic resonance imaging workers. J Occup Med 35:1191-1195, 1993.
M Nakagawa: Effects of magnetic fields on fertility, general reproductive performance and growth of mice. Nippon Eiseigaku Zasshi 34:488-495 (1979).
----- Original Message -----
Sent: Tuesday, June 07, 2005 2:36 PM
Subject: Re: [forum-elettrosmog] Referendum-Telefonino e Fecondazione assistita.
Mi può citare gli studi, dove viene rilevato un incremento dell'infertilità maschile in seguito a somminstrazione prolungata di radiazioni non ionizzanti?
E in particolar modo potrei avere le pubblicazioni dove si mettono in relazione le onde elettromagnetiche non ionizzanti e la riduzione di motilità degli spermatozoi?
Oggetto: Referendum -
Telefonino e Fecondazione assistita.
Mai come in questa occasione apprezziamo la Chiesa nei messaggi alla difesa della famiglia e della vita, valori tra i più importanti nel rispetto dell'uomo.
Ma perché il messaggio produca gli effetti sperati diviene imperativo dispiegare, con la massima fermezza e autorevolezza di cui è dotata, quella informazione occultata da autorità sanitarie e politiche e dai media stessi, timorosi di infastidire quei gruppi economici che hanno investito grandi capitali intorno ad un oggetto, utile certamente, ma sicuramente molto pericoloso.
Il telefonino, persino nella tasca dei bambini, si sta rivelando un vero e proprio strumento di sterilizzazione di massa: coppie affannate alla ricerca di eredi impegnate in esami clinici per scoprire eventuali deficienze nascoste, non a loro imputabili, ma a quante di eminenze scientifiche tacitate e pressate da quei grandi interessi.
Ognuno si esprima come vuole al referendum, ma deve anche sapere che i figli sono il risultato di una coppia giustamente informata; permanentemente in tasca, le onde elettromagnetiche, rallentano la motilità degli spermatozoi generando infertilità: favore per chi non vuole figli, sfortuna per chi li cerca.
Ricorrere al prestito per avere figli , alternativa insostituibile per deficienze naturali, rende pressoché inutile l'istituto del matrimonio: ognuno si accoppierà come e quando riterrà più opportuno.
Come sempre è l'informazione corretta e obiettiva a rendere liberi nelle loro scelte gli uomini.
Centro Documentazione Campi Elettro Magnetici
INFORMAZIONI ed INIZIATIVE sull'Inquinamento Elettromagnetico