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Volume 52, Number 2 >

Iodine intake as a possible cause of discontinuous decline in sperm counts : A re-evaluation of historical and geographic variation in semen quality

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/jjvr.52.2.85

Title: Iodine intake as a possible cause of discontinuous decline in sperm counts : A re-evaluation of historical and geographic variation in semen quality
Authors: Sakamoto, Kentaro Q Browse this author →KAKEN DB
Ishizuka, Mayumi Browse this author →KAKEN DB
Kazusaka, Akio Browse this author
Fujita, Shoichi Browse this author
Keywords: geographical variation
iodine intake
sperm count
Issue Date: Aug-2004
Publisher: The Graduate School of Veterinary Medicine, Hokkaido University
Journal Title: Japanese Journal of Veterinary Research
Volume: 52
Issue: 2
Start Page: 85
End Page: 94
Abstract: In order to examine whether iodine supplements may have caused a global decline in sperm concentrations during the past several decades, the synchronicity of the decline in mean sperm counts and the introduction of iodine supplements was analyzed statistically. A positive correlation between the incidence of thyroid disease and sperm counts has been detected in Europe. In addition, it has been shown that sperm counts began falling around 1965 in the United States, 40 years after iodine supplements were introduced. Mean sperm counts before and after 1965 were 111 x 10⁶/ml and 70 x 10⁶/ml, respectively, in calculations weighted by the number of subjects included in each individual publication. The timing of the declines coincided with the introduction of iodine supplements in the United States, France, and the United Kingdom. The implications are that the global decline in sperm concentrations may be caused by iodine intake. Geograohical variation in the types of sperm count decline also appears to be present.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/10513
Appears in Collections:Japanese Journal of Veterinary Research > Volume 52, Number 2

Submitter: 坂本 健太郎

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