Rafati A, Rahimi S, Talebi A, Soleimani A, Haghani M, Mortazavi S M J
Physiology Department, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
Medical Physics and Medical Engineering Department, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
J Biomed Phys Eng. 2015 Sep 1;5(3):133-42. eCollection 2015 Sep.
The rapid growth of wireless communication technologies has caused public concerns regarding the biological effects of electromagnetic radiations on human health. Some early reports indicated a wide variety of non-thermal effects of electromagnetic radiation on amphibians such as the alterations of the pattern of muscle extractions. This study is aimed at investigating the effects of exposure to radiofrequency (RF) radiation emitted from mobile phone jammers on the pulse height of contractions, the time interval between two subsequent contractions and the latency period of frog's isolated gastrocnemius muscle after stimulation with single square pulses of 1V (1 Hz).
Frogs were kept in plastic containers in a room. Animals in the jammer group were exposed to radiofrequency (RF) radiation emitted from a common Jammer at a distance of 1m from the jammer's antenna for 2 hours while the control frogs were only sham exposed. Then animals were sacrificed and isolated gastrocnemius muscles were exposed to on/off jammer radiation for 3 subsequent 10 minute intervals. Isolated gastrocnemius muscles were attached to the force transducer with a string. Using a PowerLab device (26-T), the pattern of muscular contractions was monitored after applying single square pulses of 1V (1 Hz) as stimuli.
The findings of this study showed that the pulse height of muscle contractions could not be affected by the exposure to electromagnetic fields. However, the latency period was effectively altered in RF-exposed samples. However, none of the experiments could show an alteration in the time interval between two subsequent contractions after exposure to electromagnetic fields.
These findings support early reports which indicated a wide variety of non-thermal effects of electromagnetic radiation on amphibians including the effects on the pattern of muscle extractions.
无线通信技术的迅速发展引发了公众对电磁辐射对人类健康生物效应的关注。一些早期报告指出，电磁辐射对两栖动物有各种各样的非热效应，比如肌肉收缩模式的改变。本研究旨在调查暴露于手机信号干扰器发出的射频（RF）辐射对青蛙离体腓肠肌在1V（1Hz）单方形脉冲刺激后的收缩脉冲高度、两次连续收缩之间的时间间隔以及潜伏期的影响。
青蛙饲养在室内的塑料容器中。干扰器组的动物在距离干扰器天线1米处暴露于普通干扰器发出的射频（RF）辐射下2小时，而对照青蛙仅进行假暴露。然后处死动物，将离体腓肠肌在随后的3个10分钟间隔内暴露于干扰器开/关辐射下。离体腓肠肌用一根绳子连接到力传感器上。使用PowerLab设备（26 - T），在施加1V（1Hz）单方形脉冲作为刺激后监测肌肉收缩模式。
本研究结果表明，肌肉收缩的脉冲高度不受电磁场暴露的影响。然而，暴露于射频的样本的潜伏期有显著改变。然而，没有任何实验能表明暴露于电磁场后两次连续收缩之间的时间间隔有变化。
这些发现支持了早期报告，即电磁辐射对两栖动物有各种各样的非热效应，包括对肌肉收缩模式的影响。
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