Turkije: Gehoorschade bij vooral vrouwelijke volwassen konijnen na blootstelling aan GSM. (upd+corr)
donderdag, 04 juni 2009 - Categorie: Onderzoeken
Bron: International Journal of Pediatric Otorhinolaryngology. 2009 May 26.
Effects of GSM-like Radiofrequency on distortion product otoacoustic emissions of rabbits: Comparison of infants versus adults.
Budak GG, Muluk NB, Budak B, Oztürk GG, Apan A, Seyhan N.
Gazi University Faculty of Medicine, Nanomedicine Research Laboratory, Ankara, Turkey.
OBJECTIVES: The aim of this study is to investigate the potential hazardous effects of 1800MHz Global System for Mobile Communications-like (GSM-like) Radiofrequency (RF) exposure on the cochlear functions of female infant and adult rabbits by measuring Distortion Product Otoacoustic Emission (DPOAE) - (Distortion-Product Otoacoustic Emission- Stopumts) - response amplitudes.
METHODS: Eighteen each one-month-old New Zealand White female rabbits and eighteen each 13-month-old adult rabbits were included into the study. They were randomly divided into four groups. Nine infant rabbits (Group 1) were not exposed to 1800MHz GSM-like RF (Infant Control, C-In). Nine infant rabbits (Group 2) were exposed to 1800MHz GSM-like RF, 15min daily for 7 days after they reached one-month of age (Infant RF, RF-In). Nine adult rabbits were not exposed to 1800MHz GSM-like RF, 15min daily for 7 (Adult Control, C-Ad). Nine adult rabbits were exposed to 1800MHz GSM-like RF, 15min daily for 7 days (Adult RF, RF-Ad). Cochlear functions were assessed by DPOAEs at 1.0-8.0kHz.
RESULTS: At 1.0-2.0 and 6.0kHz, the mean DPOAE values of Group 2 were significantly higher than that of Group 1. At 3.0-8.0kHz, the mean DPOAE values of Group 4 were significantly lower than that of Group 1. At 6.0-8.0kHz, the mean DPOAE values of Group 2 were significantly higher than that of Group 3. At 1.0-8.0kHz, the mean DPOAE values of Group 4 were significantly lower than that of Group 2. At 1.0-8.0kHz, the mean DPOAE values of Group 4 were significantly lower than that of Group 3.
CONCLUSION: Harmful effects of GSM-like 1800MHz RF exposure was detected more in the adult female rabbits than infant female rabbits by DPOAE measurement. Prolonged exposure and hyperthermia related to the power density of applied RFR, increasing the temperature in the ear canal, may decrease the DPOAE amplitudes. Water containing medium in the middle ear of infant rabbits may play the protective role **from the RF damage.
In dit verband is wellicht ook een artikel in Mens Health (Juni 2009) interessant waarin de volgende passage voorkomt:
Having trouble hearing the guy on the other side? Don't be quick to blame your mobile service provider, because it's probably your mobile harming your hearing, Indian researchers say. In a study of 100 cell users, the scientists found that four years of heavy usage (an hour a day) diminished the users' ability to hear high frequencies, making it hard for them to distinguish between certain sounds.
Always use a headset. ''The electromagnetic waves emitted by handsets can affect your inner-ear mechanics over time,'' says Dr Naresh Panda, the study's lead author. Using a headset moves your mobile away from your ear.
De passage kunt u vinden op:
Naresh Panda heeft veel onderzoek gedaan naar slechthorendheid. De genoemde studie is gepubliceerd op 19 september 2007 onder de titel Audiological Disturbances in Long-Term Mobile Phone Users
Authors: Naresh K. Panda, MBBS, MS, DNB, FRCSEd; Sanjay Munjal, PhD; Jaimanti Bakshi, MS (ORL), DNB
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