Key result
Nighttime exposure to 60 Hz magnetic fields fails to alter heart rate variability in men.
Why the study?
Previous research showed intermittent exposure to 60 Hz magnetic fields altered HRV in men during sleep, but results were inconsistent under different conditions.
In previous research, intermittent exposure to sinusoidal 60 Hz magnetic fields at a resultant flux density of 28.3 microT was found to alter heart rate variability (HRV) in men during night sleep. When the 24 men in the present study were exposed under similar conditions, HRV was not altered. The previous studies included the hourly collection of blood samples via an indwelling venous catheter, while the present study did not. This may account for the observed differences in results. Further research is needed to determine if field exposure interacts with physiological arousal mechanisms to alter autonomic nervous system control over cardiac rhythms.
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Graham et al. (2000) studied this question. Intermittent exposure to sinusoidal 60 Hz magnetic fields was evaluated on Heart rate variability (HRV). Intermittent exposure to sinusoidal 60 Hz magnetic fields at 28.3 microT did not alter heart rate variability in men during night sleep.
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