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Medical/biological Study (experimental study)

The cardiovascular response to an acute 1800-microT, 60-Hz magnetic field exposure in humans. med./biol.

By: McNamee DA, Corbacio M, Weller JK, Brown S, Prato FS, Thomas AW, Legros AG
Published in: Int Arch Occup Environ Health 2010; 83 (4): 441 - 454 ( open external web page PubMed Entry , open external web page Journal web site )

Aim of study (according to author)
To study the effects of 1h exposure to an 1800 µT, 60 Hz magnetic field on human microcirculation (skin blood perfusion) and macrocirculation (heart rate, low frequency heart rate variability (0.04-0.15 Hz), and high frequency heart rate variability (0.15-0.4 Hz)).
Background/further details:
58 subjects participated in this study consisting of two testing sessions (real exposure and sham exposure) administered on separate days. Each session included four consecutive blocks of measurements, separated by 15 min rest periods.

Endpoint

Exposure
General category: magnetic field, low frequency field, 50/60 Hz (AC)

Field characteristicsParameters
60 Hz
exposure duration: continuous for 1 h		magnetic flux density: 1800 µT
current density: 10 mA/cm² (induced current)

FIELD View further expo parameters

Exposed system:
human
whole body exposure

Methods
Endpoint/Measurement parameters/Methodology

investigation on living organism
investigated organ system: cardiovascular system

time of investigation: before, during and after exposure

Main outcome of study (according to author)
No effect of a 60 Hz magnetic field exposure at 1800 µT was demonstrated on skin blood perfusion or any of the ECG parameters recorded. The data suggest that magnetic field exposure tends to marginally increase skin surface temperature, mainly when a subject is exposed first prior to the sham exposure condition. However, small fluctuations in ambient room temperature might have been a confounder in this experiment. Indeed, the fact that skin surface temperatures remained steady over the exposure session while decreasing in the sham exposure session might be the consequence of a small room heating effect of half a degree produced by the exposure system functioning. Nevertheless, the hypothesis of a magnetic field effect on superficial skin temperature regulation cannot be excluded.

(Study character: medical/biological study, experimental study, full/main study, double-blind study)

Study funded by

  • Hydro-Québec, Canada
  • Canadian Institutes of Health Research (CIHR)
  • Canadian Foundation for Innovation (CFI), Canada
  • Ontario Research and Development Challenge Fund (ORDCF), Canada

Related articles i
Glossary: 60 Hz, AC, biological, blood perfusion, cardiovascular system, confounder, current, current density, double-blind study, ECG, endpoint, exposed, exposure, full/main study, heart rate, heart rate variability, high frequency, human, hypothesis, Hz, induced, laser-Doppler flowmetry, low frequency, magnetic field, magnetic flux density, microcirculation, session, sham exposure, skin, subject, thermoregulation, whole body exposure

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