Study type: Medical/biological study (experimental study)

The Short-Term Effect of Occupational Levels of 50 Hz Electromagnetic Field on Human Heart Rate Variability med./bio.

Published in: Bioelectromagnetics 2021; 42 (1): 60-75

Aim of study (acc. to author)

The effects of a short‐term effect exposure of healthy males to a 50 Hz magnetic field on heart rate and heart rate variability should be investigated.

Background/further details

Healthy males were randomly assigned to an exposure group (n=17) and sham exposure group (n=17).



Exposure Parameters
Exposure 1: 50 Hz
Exposure duration: 5 minutes

Exposure 1

Main characteristics
Frequency 50 Hz
Exposure duration 5 minutes
Exposure setup
Exposure source
Chamber specially prepared, quiet room with an ambient temperature of 25°C
Setup coils were made of 2 mm copper wire wound on a 70 cm diameter circular frame, with 350 turns per coil; epoxy was layered between the loops to glue them together to minimize vibration noise when the coils were activated; the two coils were mounted 35 cm apart on a wooden framework so that the magnetic field was horizontal; the participants were asked to lie supine on a wooden stretcher placed in the center of the Helmholtz coil system to provide a homogeneous 15 × 15 × 15 cm3 magnetic field area in the participants' heart region
Sham exposure A sham exposure was conducted.
Measurand Value Type Method Mass Remarks
magnetic flux density 28 µT - measured - ±2 μT; at the heart position
magnetic flux density 4 µT - measured - ±1 μT; at the head position

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

SDNN, RMSSD, LF and HF were significantly increased in the exposure group compared to the sham exposure group during the exposure to the magnetic field.
The authors concluded that short‐term effect exposure of healthy males to a 50 Hz magnetic field could influence heart rate variability indicating a possible enhancement of parasympathetic predominance.

Study character:

Study funded by

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