1
|
Kim HS, Lee YH, Choi HD, Lee AK, Jeon SB, Pack JK, Kim N, Ahn YH. Effect of Exposure to a Radiofrequency Electromagnetic Field on Body Temperature in Anesthetized and Non-Anesthetized Rats. Bioelectromagnetics 2019; 41:104-112. [PMID: 31828817 DOI: 10.1002/bem.22236] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 11/25/2019] [Indexed: 02/06/2023]
Abstract
Exposure to a radiofrequency (RF) signal at a specific absorption rate (SAR) of 4 W/kg can increase the body temperature by more than 1 °C. In this study, we investigated the effect of anesthesia on the body temperature of rats after exposure to an RF electromagnetic field at 4 W/kg SAR. We also evaluated the influence of body mass on rats' body temperature. Rats weighing 225 and 339 g were divided into sham- and RF-exposure groups. Each of the resulting four groups was subdivided into anesthetized and non-anesthetized groups. The free-moving rats in the four RF-exposure groups were subjected to a 915 MHz RF identification signal at 4 W/kg whole-body SAR for 8 h. The rectal temperature was measured at 1-h intervals during RF exposure using a small-animal temperature probe. The body temperatures of non-anesthetized, mobile 225 and 339 g rats were not significantly affected by exposure to an RF signal. However, the body temperatures of anesthetized 225 and 339 g rats increased by 1.9 °C and 3.3 °C from baseline at 5 and 6 h of RF exposure, respectively. Three of the five 339 g anesthetized and exposed rats died after 6 h of RF exposure. Thus, anesthesia and body mass influenced RF exposure-induced changes in the body temperature of rats. Bioelectromagnetics. 2020;41:104-112. © 2019 Bioelectromagnetics Society.
Collapse
Affiliation(s)
- Hye Sun Kim
- Department of Neurosurgery, Ajou University School of Medicine, Suwon, Republic of Korea.,Neuroscience Graduate Program, Department of Biomedical Sciences, Graduate School of Ajou University, Suwon, Republic of Korea
| | - Yu Hee Lee
- Department of Neurosurgery, Ajou University School of Medicine, Suwon, Republic of Korea.,Neuroscience Graduate Program, Department of Biomedical Sciences, Graduate School of Ajou University, Suwon, Republic of Korea
| | - Hyung-Do Choi
- Radio Technology Research Department, Electronics and Telecommunications Research Institute, Daejeon, Republic of Korea
| | - Ae-Kyoung Lee
- Radio Technology Research Department, Electronics and Telecommunications Research Institute, Daejeon, Republic of Korea
| | - Sang Bong Jeon
- Radio Technology Research Department, Electronics and Telecommunications Research Institute, Daejeon, Republic of Korea
| | - Jeong-Ki Pack
- Department of Radio Sciences and Engineering, College of Engineering, Chungnam National University, Daejeon, Republic of Korea
| | - Nam Kim
- School of Electrical and Computer Engineering, Chungbuk National University, Cheongju, Republic of Korea
| | - Young Hwan Ahn
- Department of Neurosurgery, Ajou University School of Medicine, Suwon, Republic of Korea.,Neuroscience Graduate Program, Department of Biomedical Sciences, Graduate School of Ajou University, Suwon, Republic of Korea
| |
Collapse
|
2
|
Zhu W, Cui Y, Feng X, Li Y, Zhang W, Xu J, Wang H, Lv S. The apoptotic effect and the plausible mechanism of microwave radiation on rat myocardial cells. Can J Physiol Pharmacol 2016; 94:849-57. [PMID: 27203380 DOI: 10.1139/cjpp-2015-0537] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Microwaves may exert adverse biological effects on the cardiovascular system at the integrated system and cellular levels. However, the mechanism underlying such effects remains poorly understood. Here, we report a previously uncharacterized mechanism through which microwaves damage myocardial cells. Rats were treated with 2450 MHz microwave radiation at 50, 100, 150, or 200 mW/cm(2) for 6 min. Microwave treatment significantly enhanced the levels of various enzymes in serum. In addition, it increased the malondialdehyde content while decreasing the levels of antioxidative stress enzymes, activities of enzyme complexes I-IV, and ATP in myocardial tissues. Notably, irradiated myocardial cells exhibited structural damage and underwent apoptosis. Furthermore, Western blot analysis revealed significant changes in expression levels of proteins involved in oxidative stress regulation and apoptotic signaling pathways, indicating that microwave irradiation could induce myocardial cell apoptosis by interfering with oxidative stress and cardiac energy metabolism. Our findings provide useful insights into the mechanism of microwave-induced damage to the cardiovascular system.
Collapse
Affiliation(s)
- Wenhe Zhu
- a Department of Biochemistry, Ji Lin Medical University, Ji Lin 132013, China
| | - Yan Cui
- b First Hospital of Jilin University, Changchun, Jilin, China
| | - Xianmin Feng
- a Department of Biochemistry, Ji Lin Medical University, Ji Lin 132013, China
| | - Yan Li
- a Department of Biochemistry, Ji Lin Medical University, Ji Lin 132013, China
| | - Wei Zhang
- a Department of Biochemistry, Ji Lin Medical University, Ji Lin 132013, China
| | - Junjie Xu
- a Department of Biochemistry, Ji Lin Medical University, Ji Lin 132013, China
| | - Huiyan Wang
- a Department of Biochemistry, Ji Lin Medical University, Ji Lin 132013, China
| | - Shijie Lv
- a Department of Biochemistry, Ji Lin Medical University, Ji Lin 132013, China
| |
Collapse
|
3
|
Ohtani S, Ushiyama A, Maeda M, Hattori K, Kunugita N, Wang J, Ishii K. Exposure time-dependent thermal effects of radiofrequency electromagnetic field exposure on the whole body of rats. J Toxicol Sci 2016; 41:655-66. [DOI: 10.2131/jts.41.655] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Shin Ohtani
- Department of Hygienic Chemistry, Meiji Pharmaceutical University
| | - Akira Ushiyama
- Department of Environmental Health, National Institute of Public Health
| | - Machiko Maeda
- Department of Hygienic Chemistry, Meiji Pharmaceutical University
| | - Kenji Hattori
- Department of Hygienic Chemistry, Meiji Pharmaceutical University
| | - Naoki Kunugita
- Department of Environmental Health, National Institute of Public Health
| | - Jianqing Wang
- Department of Computer Science and Engineering, Nagoya Institute of Technology
| | - Kazuyuki Ishii
- Department of Hygienic Chemistry, Meiji Pharmaceutical University
| |
Collapse
|
4
|
Masuda H, Hirata A, Kawai H, Wake K, Watanabe S, Arima T, Poulletier de Gannes F, Lagroye I, Veyret B. Local exposure of the rat cortex to radiofrequency electromagnetic fields increases local cerebral blood flow along with temperature. J Appl Physiol (1985) 2011; 110:142-8. [DOI: 10.1152/japplphysiol.01035.2010] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Few studies have shown that local exposure to radiofrequency electromagnetic fields (RF) induces intensity-dependent physiological changes, especially in the brain. The aim of the present study was to detect reproducible responses to local RF exposure in the parietal cortex of anesthetized rats and to determine their dependence on RF intensity. The target cortex tissue was locally exposed to 2-GHz RF using a figure-eight loop antenna within a range of averaged specific absorption rates (10.5, 40.3, 130, and 263 W/kg averaged over 4.04 mg) in the target area. Local cerebral blood flow (CBF) and temperatures in three regions (target area, rectum, and calf hypodermis) were measured using optical fiber blood flow meters and thermometers during RF exposure. All parameters except for the calf hypodermis temperature increased significantly in exposed animals compared with sham-exposed ones during 18-min exposures. Dependence of parameter values on exposure intensity was analyzed using linear regression models. The elevation of local CBF was correlated with temperature rise in both target and rectum at the end of RF exposure. However, the local CBF elevation seemed to be elevated by the rise in target temperature, but not by that of the rectal temperature, in the early part of RF exposure or at low-intensity RF exposure. These findings suggest that local RF exposure of the rat cortex drives a regulation of CBF accompanied by a local temperature rise, and our findings may be helpful for discussing physiological changes in the local cortex region, which is locally exposed to RF.
Collapse
Affiliation(s)
- Hiroshi Masuda
- University of Bordeaux, IMS Laboratory, Pessac cedex, France
| | - Akimasa Hirata
- Department of Computer Science and Engineering, Nagoya Institute of Technology, Aichi, Japan
| | - Hiroki Kawai
- Electromagnetic Compatibility Group, Applied Electromagnetic Research Center, National Institute of Information and Communications Technology, Tokyo, Japan
| | - Kanako Wake
- Electromagnetic Compatibility Group, Applied Electromagnetic Research Center, National Institute of Information and Communications Technology, Tokyo, Japan
| | - Soichi Watanabe
- Electromagnetic Compatibility Group, Applied Electromagnetic Research Center, National Institute of Information and Communications Technology, Tokyo, Japan
| | - Takuji Arima
- Electromagnetic Compatibility Group, Applied Electromagnetic Research Center, National Institute of Information and Communications Technology, Tokyo, Japan
- Department of Electrical and Electronics Engineering of Tokyo University of Agriculture and Technology, Tokyo, Japan; and
| | | | - Isabelle Lagroye
- University of Bordeaux, IMS Laboratory, Pessac cedex, France
- Bioelectromagnetics Laboratory, École Pratique des Hautes Études, Pessac cedex, France
| | - Bernard Veyret
- University of Bordeaux, IMS Laboratory, Pessac cedex, France
- Bioelectromagnetics Laboratory, École Pratique des Hautes Études, Pessac cedex, France
| |
Collapse
|
5
|
Jauchem JR. The role of autacoids and the autonomic nervous system in cardiovascular responses to radio-frequency energy heating. ACTA ACUST UNITED AC 2006; 26:121-40. [PMID: 16553641 DOI: 10.1111/j.1474-8673.2006.00362.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Among the potential effects of exposure to high levels of radio-frequency energy (RFE) (which includes microwaves), an increase in body temperature is the primary consequence. Release of autacoids and activity of the autonomic nervous system may influence (or be directly responsible for) some of the physiological changes that occur in conjunction with this hyperthermia. The main focus of this review is the interaction of autacoids and the autonomic nervous system with cardiovascular changes during heating. Differences between environmental and RFE-induced heating (such as rate of temperature change and degree of skin vs. core heating) may be important when considering these effects. Antihistamines exhibited no beneficial effect on circulatory collapse during RFE-induced heating. The serotonergic blocker methysergide decreased survival time in rats during terminal RFE exposure, despite no effects on heart rate (HR) or blood pressure. Although blockade of platelet-activating factor resulted in lower HR before RFE exposure, there was a lack of effect on the subsequent increase in HR during heating. Nitric oxide did not contribute to the hypotension that occurs due to rapid heating by RFE exposure. There have been either no or very limited studies of effects of prostaglandins, bradykinin, or angiotensin on RFE-induced heating responses. beta-Adrenoceptor antagonism with propranolol resulted in significantly decreased survival times and lower final colonic temperatures during RFE exposure. A lack of effects of nadolol on survival time and temperature, coupled with its poor ability to traverse the blood-brain barrier, suggests that central beta-adrenergic stimulation rather than peripheral stimulation may alter thermoregulation. Effects of the autonomic nervous system (as studied by adrenoceptor blockade) on potassium changes during heating have not been fully investigated. Such changes could be important in animals' responses to RFE and other modalities of heating, and should be studied in future.
Collapse
Affiliation(s)
- J R Jauchem
- Air Force Research Laboratory, Directed Energy Bio-Effects Division, Radio-Frequency Radiation Branch, Brooks City-Base, TX 78235-5147, USA
| |
Collapse
|
6
|
Kim MJ, Rhee SJ. Effects of Green Tea Catechin on Serum Lipid Composition and Angiotensin- Converting Enzyme Activity in Rats Exposed to Microwave. Prev Nutr Food Sci 2004. [DOI: 10.3746/jfn.2004.9.2.156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
|
7
|
Jauchem JR, Ryan KL, Frei MR. Cardiovascular and thermal effects of microwave irradiation at 1 and/or 10 GHz in anesthetized rats. Bioelectromagnetics 2000; 21:159-66. [PMID: 10723015 DOI: 10.1002/(sici)1521-186x(200004)21:3<159::aid-bem2>3.0.co;2-#] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Relatively large thermal gradients may exist during exposure of an animal to microwaves (MWs), particularly at high frequencies. Differences in thermal gradients within the body may lead to noticeable differences in the magnitude of cardiovascular changes resulting from MW exposure. This study compares the thermal distribution and cardiovascular effects of exposure to a single MW frequency with effects of simultaneous exposure to two frequencies. Ketamine-anesthetized male Sprague-Dawley rats (n = 58) were exposed individually to one of three conditions: 1-GHz, 10-GHz, or combined 1- and 10-GHz MWs at an equivalent whole-body specific absorption rate of 12 W/kg. The continuous-wave irradiation was conducted under far-field conditions with animals in E orientation (left lateral exposure, long axis parallel to the electric field) or in H orientation (left lateral exposure, long axis perpendicular to the electric field). Irradiation was started when colonic temperature was 37.5 degrees C and was continued until lethal temperatures were attained. Colonic, tympanic, left and right subcutaneous, and tail temperatures, and arterial blood pressure, heart rate, and respiratory rate were continuously recorded. In both E and H orientations, survival time (i.e., time from colonic temperature of 37.5 degrees C until death) was lowest in animals exposed at 1-GHz, intermediate in those exposed at 1- and 10-GHz combined, and greatest in the 10-GHz group (most differences statistically significant). At all sites (with the exception of right subcutaneous), temperature values in the 1- and 10-GHz combined group were between those of the single-frequency exposure groups in both E and H orientations. During irradiation, arterial blood pressure initially increased and then decreased until death. Heart rate increased throughout the exposure period. The general, overall patterns of these changes were similar in all groups. The results indicate that no unusual physiological responses occur during multi-frequency MW exposure, when compared with results of single-frequency exposure. Bioelectromagnetics 21:159-166, 2000. Published 2000 Wiley-Liss, Inc.
Collapse
Affiliation(s)
- J R Jauchem
- Air Force Research Laboratory, Human Effectiveness Directorate, Directed Energy Bioeffects Division, Radio Frequency Radiation Branch, Brooks Air Force Base, Texas 78235-5324, USA.
| | | | | |
Collapse
|
8
|
|