title: Exposure to magnetic fields and the risk of poor sperm quality.
abstract: We conducted a population-based case-control study among healthy sperm donors to study exposure to magnetic fields (MFs) and poor sperm quality. All participants wore a meter to capture daily MF exposure. After controlling for confounders, compared to those with lower MF exposure, those whose 90th percentile MF level > or = 1.6mG had a two-fold increased risk of abnormal sperm motility and morphology (odds ratio (OR): 2.0, 95% confidence interval (CI): 1.0-3.9). Increasing duration of MF exposure above 1.6 mG further increased the risk (p=0.03 for trend test). Importantly, the association and dose-response relationship were strengthened when restricted to those whose measurement day reflected their typical day of the previous 3 months (a likely period of spermatogenesis). Age-adjusted Spearman Rank Order Correlations showed an inverse correlation between MF exposure and all semen parameters. Our study provides some evidence for the first time that MF exposure may have an adverse effect on sperm quality.
authors.affiliation: Division of Research, Kaiser Foundation Research Institute, Kaiser Permanente Northern California, 2000 Broadway, Oakland, CA 94612, United States. dkl@dor.kaiser.org
authors.forename: De-Kun
authors.initials: DK
authors.lastname: Li
authors.forename: Bei
authors.initials: B
authors.lastname: Yan
authors.forename: Zheng
authors.initials: Z
authors.lastname: Li
authors.forename: Ersheng
authors.initials: E
authors.lastname: Gao
authors.forename: Maohua
authors.initials: M
authors.lastname: Miao
authors.forename: Dongming
authors.initials: D
authors.lastname: Gong
authors.forename: XiaoPing
authors.initials: X
authors.lastname: Weng
authors.forename: Jeannette R
authors.initials: JR
authors.lastname: Ferber
authors.forename: Wei
authors.initials: W
authors.lastname: Yuan
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D004574:Electromagnetic Fields / Q000009:adverse effects; D004781:Environmental Exposure / Q000009:adverse effects*; D006801:Humans; D008280:Magnetics; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D013076:Sperm Count; D013081:Sperm Motility; D013094:Spermatozoa / Q000002:abnormalities / Q000502:physiology*; D014019:Tissue Donors