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Can explicit suggestions about the harmfulness of EMF exposure exacerbate a nocebo response in healthy controls?

Journal Article


Abstract


  • © 2018 Elsevier Inc. While there has been consistent evidence that symptoms reported by individuals who suffer from Idiopathic Environmental Intolerance attributed to Electromagnetic Fields (IEI-EMF) are not caused by EMF and are more closely associated with a nocebo effect, whether this response is specific to IEI-EMF sufferers and what triggers it, remains unclear. The present experiment tested whether perceived EMF exposure could elicit symptoms in healthy participants, and whether viewing an ‘alarmist’ video could exacerbate a nocebo response. Participants were randomly assigned to watch either an alarmist (N = 22) or control video (N = 22) before completing a series of sham and active radiofrequency (RF) EMF exposure provocation trials (2 open-label, followed by 12 randomized, double-blind, counterbalanced trials). Pre- and post-video state anxiety and risk perception, as well as belief of exposure and symptom ratings during the open-label and double-blind provocation trials, were assessed. Symptoms were higher in the open-label RF-ON than RF-OFF trial (p <.001). No difference in either symptoms (p =.183) or belief of exposure (p =.144) was observed in the double-blind trials. Participants who viewed the alarmist video had a significant increase in symptoms (p =.041), state anxiety (p <.01) and risk perception (p <.001) relative to the control group. These results reveal the crucial role of awareness and belief in the presentation of symptoms during perceived exposure to EMF, showing that healthy participants exhibit a nocebo response, and that alarmist media reports emphasizing adverse effects of EMF also contribute to a nocebo response.

Publication Date


  • 2018

Citation


  • Verrender, A., Loughran, S., Dalecki, A., Freudenstein, F. & Croft, R. (2018). Can explicit suggestions about the harmfulness of EMF exposure exacerbate a nocebo response in healthy controls?. Environmental Research, 166 409-417.

Scopus Eid


  • 2-s2.0-85048834548

Number Of Pages


  • 8

Start Page


  • 409

End Page


  • 417

Volume


  • 166

Place Of Publication


  • United States

Abstract


  • © 2018 Elsevier Inc. While there has been consistent evidence that symptoms reported by individuals who suffer from Idiopathic Environmental Intolerance attributed to Electromagnetic Fields (IEI-EMF) are not caused by EMF and are more closely associated with a nocebo effect, whether this response is specific to IEI-EMF sufferers and what triggers it, remains unclear. The present experiment tested whether perceived EMF exposure could elicit symptoms in healthy participants, and whether viewing an ‘alarmist’ video could exacerbate a nocebo response. Participants were randomly assigned to watch either an alarmist (N = 22) or control video (N = 22) before completing a series of sham and active radiofrequency (RF) EMF exposure provocation trials (2 open-label, followed by 12 randomized, double-blind, counterbalanced trials). Pre- and post-video state anxiety and risk perception, as well as belief of exposure and symptom ratings during the open-label and double-blind provocation trials, were assessed. Symptoms were higher in the open-label RF-ON than RF-OFF trial (p <.001). No difference in either symptoms (p =.183) or belief of exposure (p =.144) was observed in the double-blind trials. Participants who viewed the alarmist video had a significant increase in symptoms (p =.041), state anxiety (p <.01) and risk perception (p <.001) relative to the control group. These results reveal the crucial role of awareness and belief in the presentation of symptoms during perceived exposure to EMF, showing that healthy participants exhibit a nocebo response, and that alarmist media reports emphasizing adverse effects of EMF also contribute to a nocebo response.

Publication Date


  • 2018

Citation


  • Verrender, A., Loughran, S., Dalecki, A., Freudenstein, F. & Croft, R. (2018). Can explicit suggestions about the harmfulness of EMF exposure exacerbate a nocebo response in healthy controls?. Environmental Research, 166 409-417.

Scopus Eid


  • 2-s2.0-85048834548

Number Of Pages


  • 8

Start Page


  • 409

End Page


  • 417

Volume


  • 166

Place Of Publication


  • United States