Medizinische/biologische Studie (experimentelle Studie)

Effects of mobile phone exposure on time frequency fine structure of transiently evoked otoacoustic emissions med./bio.

[Wirkungen einer Mobilfunk-Exposition auf die Zeit-Frequenz-Feinstruktur transitorisch evozierter otoakustischer Emissionen]

Von: Paglialonga A, Tognola G, Parazzini M, Lutman ME, Bell SL, Thuroczy G, Ravazzani P

Veröffentlicht in: J Acoust Soc Am 2007; 122 (4): 2174-2182

Ziel der Studie (lt. Autor)

Es sollten mögliche feine Veränderungen der Kochlea-Funktion bewertet werden, indem transitorisch evozierte otoakustische Emissionen (TEOAEs) bei normal-hörenden Testpersonen nach Exposition bei elektromagnetischen Feldern, ausgesendet durch ein GSM-Mobiltelefon, gemessen wurden.

Hintergrund/weitere Details

TEOAEs wurden bei 27 gesunden jungen Erwachsenen vor und nach einer 10-minütigen tatsächlichen Exposition oder Schein-Exposition aufgezeichnet.

Endpunkt

Kochlea-Funktion (transitorisch evozierte otoakustische Emissionen)

Exposition/Befeldung (teilweise nur auf Englisch)

Exposition	Parameter
Exposition 1: 900 MHz Modulationsart: gepulst Expositionsdauer: kontinuierlich für 10 min	Leistung: 2 W SAR: 0,41 W/kg Maximum
Exposition 2: 1.800 MHz Modulationsart: gepulst Expositionsdauer: kontinuierlich für 10 min	Leistung: 1 W SAR: 0,19 W/kg Maximum

Allgemeine Informationen

Half of the participants were exposed at 900 MHz and 1800 MHz, respectively.

Exposition 1

Hauptcharakteristika

Frequenz	900 MHz
Typ	elektromagnetisches Feld
Expositionsdauer	kontinuierlich für 10 min

Modulation

Modulationsart	gepulst
Zusatzinfo	GSM

Expositionsaufbau

Expositionsquelle	Mobiltelefon GSM, at full power, software-controlled
Aufbau	The phone was positioned in accordance with CENELEC standard EN 50361 by a system consisting of three main parts, all made of non-metallic plastic materials: a headband, an adjustable arm and a phone holder attached to a bracket glued to the battery pack of the phone.
Schein-Exposition	Eine Schein-Exposition wurde durchgeführt.
Zusatzinfo	The procedure was performed twice in a double-blind design on separate days (at least 24 h apart). A 50 Ω resistive load and an open-circuit dummy load were connected to the remote antenna connector of the phone for sham and real exposure, respectively. The effectiveness of the load was confirmed by near field surface scanning of the phone.

Parameter

Messgröße	Wert	Typ	Methode	Masse	Bemerkungen
Leistung	2 W	-	gemessen	-	-
SAR	0,41 W/kg	Maximum	gemessen	-	-

Zusätzliche Parameterdetails

A controlled sound exposure, consisting of running speech to which the participant was asked to attend, was delivered in both exposure conditions via an insert earphone at a level equivalent to free field speech material at 60 dB(A).

Mess- und Berechnungsdetails

The power of the phone had previously been measured at the external antenna output using a frequency and power meter and circulators. SAR measurements were made in standard brain tissue equivalent liquid in a phantom using a three-dimensional step motor robot system, internal E-field probe and a non-metallic positioning system holding the phone in the "touch position" according to CENELEC standard EN 50361. These measurements were made at a distance of 30 mm below the surface of the phantom which corresponds approximately to that of the cochlea.

Exposition 2

Hauptcharakteristika

Frequenz	1.800 MHz
Typ	elektromagnetisches Feld
Expositionsdauer	kontinuierlich für 10 min

Modulation

Modulationsart	gepulst
Zusatzinfo	GSM

Expositionsaufbau

Expositionsquelle	gleicher Aufbau wie Exposition 1
Schein-Exposition	Eine Schein-Exposition wurde durchgeführt.

Parameter

Messgröße	Wert	Typ	Methode	Masse	Bemerkungen
Leistung	1 W	-	gemessen	-	-
SAR	0,19 W/kg	Maximum	gemessen	-	-

Exponiertes System:

Mensch
Teilkörperexposition: Kopf

Methoden Endpunkt/Messparameter/Methodik

Kochlea-Funktion (transitorisch evozierte otoakustische Emissionen; Breitband-Analyse und temporäre und spektrale Feinstruktur)

Untersuchtes System:

Untersuchung am lebenden Organismus

Untersuchtes Organsystem:

Untersuchungszeitpunkt:

vor der Befeldung
nach der Befeldung

Hauptergebnis der Studie (lt. Autor)

Die Ergebnisse zeigen, dass es keine messbare Wirkung auf transitorisch evozierte otoakustische Emissionen (TEOAEs) direkt nach einer 10-minütigen Exposition bei maximaler Leistung eines GSM-Handys gibt, weder bei Analyse des gesamten Frequenz-Bereichs noch bei Analyse der Zeit-Frequenz-Feinstruktur.

Studienmerkmale:

medizinische/biologische Studie
experimentelle Studie
Voll-/Hauptstudie

Studie gefördert durch

European Project GUARD ("Potential adverse effects of GSM cellular phones on hearing")
European Union (EU)/European Commission

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