Binboğa Erdal, Tok Serdar, Munzuroğlu Mustafa
Department of Biophysics, Faculty of Medicine, Ege University, Izmir, Turkey.
Faculty of Sport Sciences, Celal Bayar University, Manisa, Turkey.
Bioelectromagnetics. 2021 Jan;42(1):60-75. doi: 10.1002/bem.22308. Epub 2020 Nov 19.
Previous studies have indicated that there is no consensus on the effects of extremely low-frequency electromagnetic (ELF-EMF) exposure on the cardiovascular system. This study aimed to explore the short-term effect of ELF-EMF exposure on heart rate (HR) and HR variability (HRV). The sample consisted of 34 healthy males aged 18-27 years. The participants were randomly assigned to the EMF (n = 17) or the Sham group (n = 17). We employed a double-blind repeated-measures design consisting of three 5 min experimental periods. The chest region of each individual in the EMF group was exposed to 50 Hz, 28 μT, linear polarized, continuous EMF during the EMF exposure period. HR and HRV data were recorded continuously by using a photoplethysmography sensor. Within-subject statistical analysis indicated a significant HR deceleration in both the EMF and Sham groups. However, the standard deviation of the NN intervals (SDNN), root mean square of successive differences (RMSSD), low-frequency (LF), and high-frequency (HF) powers increased only in the EMF group and remained stable in the Sham group. We also compared the same HRV indices measured during the EMF and Sham periods between the two experimental groups. The between-subject analysis results demonstrated significantly higher SDNN, RMSSD, LF, and HF values in the EMF group than in the Sham group. The LF/HF ratio did not change significantly within and between groups. On the basis of these results, we concluded that short-term exposure of the chest region to ELF-EMF could potentially enhance parasympathetic predominance during the resting condition. Bioelectromagnetics. 2021;42:60-75. © 2020 Bioelectromagnetics Society.
先前的研究表明，对于极低频电磁（ELF - EMF）暴露对心血管系统的影响尚无共识。本研究旨在探讨ELF - EMF暴露对心率（HR）和心率变异性（HRV）的短期影响。样本包括34名年龄在18 - 27岁的健康男性。参与者被随机分配到电磁场（n = 17）组或假刺激组（n = 17）。我们采用了双盲重复测量设计，包括三个5分钟的实验周期。在电磁场暴露期间，电磁场组中每个个体的胸部区域暴露于50Hz、28μT、线性极化、连续的电磁场。使用光电容积脉搏波描记传感器连续记录HR和HRV数据。受试者内统计分析表明，电磁场组和假刺激组的心率均有显著减慢。然而，只有电磁场组的正常到正常间期标准差（SDNN）、逐次差值的均方根（RMSSD）、低频（LF）和高频（HF）功率增加，而假刺激组保持稳定。我们还比较了两个实验组在电磁场和假刺激期间测量的相同HRV指标。受试者间分析结果表明，电磁场组的SDNN、RMSSD、LF和HF值显著高于假刺激组。组内和组间的LF/HF比值没有显著变化。基于这些结果，我们得出结论，胸部区域短期暴露于ELF - EMF可能会在静息状态下增强副交感神经优势。《生物电磁学》。2021；42：60 - 75。© 2020生物电磁学协会。
