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Objective The present study aimed to test whether exposure to radiofrequency electromagnetic fields(RF-EMF) emitted by mobile phone base stations may have effects on salivary alpha-amylase,immunoglobulin A(IgA),and cortisol levels. Methods Fifty seven participants were randomly allocated to one of three different experimental scenarios(22 participants to scenario 1,26 to scenario 2,and 9 to scenario 3).Each participant went through five 50-minute exposure sessions.The main RF-EMF source was a GSM-900-MHz antenna located at the outer wall of the building.In scenarios 1 and 2,the first,third,and fifth sessions were“low”(median power flux density 5.2μW/m~2) exposure.The second session was“high”(2126.8μW/m~2), and the fourth session was“medium”(153.6μW/m~2) in scenario 1,and vice versa in scenario 2.Scenario 3 had four“low”exposure conditions,followed by a“high”exposure condition.Biomedical parameters were collected by saliva samples three times a session.Exposure levels were created by shielding curtains.Results In scenario 3 from session 4 to session 5(from“low”to“high”exposure),an increase of cortisol was detected,while in scenarios 1 and 2,a higher concentration of alpha-amylase related to the baseline was identified as compared to that in scenario 3.IgA concentration was not significantly related to the exposure.Conclusions RF-EMF in considerably lower field densities than ICNIRP-guidelines may influence certain psychobiological stress markers.
Objective The present study aimed to test whether exposure to radiofrequency electromagnetic fields (RF-EMF) emitted by mobile phone base stations may have effects on salivary alpha-amylase, immunoglobulin A (IgA), and cortisol levels. Methods Fifty Seven participants were randomly assigned to one of three different experimental scenarios (22 participants to scenario 1, 26 to scenario 2, and 9 to scenario 3). Each participant went through five 50-minute exposure sessions. The main RF-EMF source was a GSM-900-MHz antenna located at the outer wall of the building. scenarios 1 and 2, the first, third, and fifth sessions were “low ” (median power flux density 5.2 μW / m ~ 2) exposure.The second session was high “(2126.8 μW / m ~ 2), and the fourth session was” medium “(153.6 μW / m ~ 2) in scenario 1, and vice versa in scenario 2. Scenario 3 had four ” low exposure conditions, followed by a “high ” exposure condition.Biomedical parameters were collected by saliva samples three times a session.Exposure levels were created by shielding curtains.Results In scenario 3 from session 4 to session 5 (from “low ” to “high ” exposure), an increase of cortisol was detected, while in scenarios 1 and 2, a higher concentration of alpha -amylase related to the baseline was identified as compared to that in scenario 3. IgA concentration was not significantly related to the exposure. Confc RF-EMF in significantly lower field densities than ICNIRP-guidelines may influence certain psychobiological stress markers.