Key result
Occupational electromagnetic field exposure links to subtle autonomic cardiac regulation and circadian rhythm disturbances.
Why the study?
The effects of occupational exposure to electromagnetic fields on autonomic cardiac regulation and circadian rhythms in workers at AM broadcasting stations were unclear.
Does occupational exposure to electromagnetic fields affect autonomic cardiac regulation in adult male workers?
Observational (n=93)
Does occupational exposure to electromagnetic fields affect autonomic cardiac regulation in adult male workers?
Occupational exposure to EM fields exceeding 100-150 V/m may cause slight, clinically insignificant disturbances in autonomic cardiac regulation.
Answers are grounded in this paper and cite their sources.
Occupational EM exposure >100-150 V/m may disturb autonomic regulation; leaves open clinical relevance and need for prospective confirmation.
Ninety-three adult males working at AM broadcasting stations (0.738–1.503 MHz) or radio line stations volunteered for cardiological examinations. The examinations included routine electrocardiogram (ECG) at rest, analysis of heart rate variability (HRV), Holter 24-h ECG, and 24-h ambulatory blood pressure (ABP). Results of cardiological examinations were correlated with individual exposure to EM fields (maximum exposure levels during working shift, daily exposure dose, and cumulative lifetime exposure). Of the 93 subjects qualified for the study, 71 (76.3%) experienced occupational RF exposure, while the remaining 22 (23.7%) had no history of regular EM exposure. ECG abnormalities or pathological changes were recorded quite frequently (50–70%) in both exposed and control populations. There was no correlation with exposure levels. We found measurable effects in the HRV and ABP parameters in the EM-exposed population, but none could be assigned clinical significance. The results suggest that exposure of workers to EM fields can cause slight disturbances in autonomic cardiac regulation and slight dysregulation of circadian rhythms in workers exposed to EM fields exceeding 100–150 V/m.
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Bortkiewicz et al. (1995) conducted an observational in Occupational electromagnetic field exposure (n=93). Occupational RF exposure (EM fields) vs. No history of regular EM exposure was evaluated on ECG abnormalities, heart rate variability, and ambulatory blood pressure. ECG abnormalities occurred in 50-70% of both groups, but occupational exposure to EM fields >100-150 V/m caused slight disturbances in autonomic cardiac regulation and circadian rhythms.
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