Air ions and mood outcomes: a review and meta-analysis

BMC Psychiatry

Research Article

Dominik D Alexander¹  Vanessa Perez²  William H Bailey³ 

[1] Exponent, Inc., Health Sciences, Center for Epidemiology, Biostatistics, and Computational Biology, 4141 Arapahoe Avenue, Suite 101, 80303, Boulder, CO, USA;Exponent, Inc., Health Sciences, Center for Epidemiology, Biostatistics, and Computational Biology, 525 West Monroe Street, Suite 1050, 60661, Chicago, IL, USA;Exponent, Inc., Health Sciences, Center for Exposure Assessment and Dose Reconstruction, 17000 Science Drive, Suite 200, 20715, Bowie, MD, USA;

关键词: Mood disorders;    Depression;    Air ionization;    Ion exposure;    Epidemiology;    Systematic review;    Negative ion;    Positive ion;   

DOI  :  10.1186/1471-244X-13-29

 received in 2012-05-16, accepted in 2013-01-08,  发布年份 2013

来源: Springer

【 摘 要 】

BackgroundPsychological effects of air ions have been reported for more than 80 years in the media and scientific literature. This study summarizes a qualitative literature review and quantitative meta-analysis, where applicable, that examines the potential effects of exposure to negative and positive air ions on psychological measures of mood and emotional state.MethodsA structured literature review was conducted to identify human experimental studies published through August, 2012. Thirty-three studies (1957–2012) evaluating the effects of air ionization on depression, anxiety, mood states, and subjective feelings of mental well-being in humans were included. Five studies on negative ionization and depression (measured using a structured interview guide) were evaluated by level of exposure intensity (high vs. low) using meta-analysis.ResultsConsistent ionization effects were not observed for anxiety, mood, relaxation/sleep, and personal comfort. In contrast, meta-analysis results showed that negative ionization, overall, was significantly associated with lower depression ratings, with a stronger association observed at high levels of negative ion exposure (mean summary effect and 95% confidence interval (CI) following high- and low-density exposure: 14.28 (95% CI: 12.93-15.62) and 7.23 (95% CI: 2.62-11.83), respectively). The response to high-density ionization was observed in patients with seasonal or chronic depression, but an effect of low-density ionization was observed only in patients with seasonal depression. However, no relationship between the duration or frequency of ionization treatment on depression ratings was evident.ConclusionsNo consistent influence of positive or negative air ionization on anxiety, mood, relaxation, sleep, and personal comfort measures was observed. Negative air ionization was associated with lower depression scores particularly at the highest exposure level. Future research is needed to evaluate the biological plausibility of this association.

【 授权许可】

Unknown   
© Perez et al; licensee BioMed Central Ltd. 2013. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.