Study type: Medical/biological study (experimental study)

Nonlinear Heart Rate Variability Measures Under Electromagnetic Fields Produced by GSM Cellular Phones. med./bio.

Published in: Electromagn Biol Med 2013; 32 (2): 173-181

Aim of study (acc. to author)

To study the nonlinear dynamics of heart rate variability during exposure to low-intensity electromagnetic fields. A group of 26 healthy subjects was investigated.

Background/further details

In the present study, an additional analysis of data of a previous study (Parazzini 2007) was performed.
Autonomic nervous system was evaluated in quiet condition (vagal prevalence; 13 minutes laying on a bed) and after a sympathetic activation (stand; after laying on a bed the subject was instructed to stand up,- also for 13 minutes). The subjects were exposed or sham exposed (at least 24 h apart).

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Modulation type: pulsed
Exposure duration: continuous for 26 min
  • power: 2 W (software controlled)
  • SAR: 0.02 W/g (10.5-13.5 cm deep)

Exposure 1

Main characteristics
Frequency 900 MHz
Type
Exposure duration continuous for 26 min
Modulation
Modulation type pulsed
Additional info

GSM

Exposure setup
Exposure source
Setup A phone positioning system (headband, adjustable arm, and phone holder) made of non-metallic plastic materials held the phone on the subject's dominant-hand side so that its longitudinal axis followed an imaginary line from the entrance to the ear canal to the corner of the mouth, in accordance with the "touch position" of CENELEC standard EN 50361 [2002].
Sham exposure A sham exposure was conducted.
Additional info Each session lasted 26 min: 13 min in supine rest condition followed by 13 min in stand condition.
Parameters
Measurand Value Type Method Mass Remarks
power 2 W - - - software controlled
SAR 0.02 W/g - - - 10.5-13.5 cm deep

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

The analysis of the data showed no statistically significant effect due to GSM exposure on the nonlinear dynamics of heart rate variability.

Study character:

Study funded by

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