منابع مشابه
Declining worldwide sperm counts: disproving a myth.
This article explores in detail the issue of the alleged decline in semen quality. The impetus for a comprehensive re-evaluation at this time is threefold: (1) the potential impact of a real decline in semen quality and subsequent human fertility is a priori critical to human welfare; (2) governments have begun to enact "anti-endocrine disruptor" legislation that is based, in part, on selected ...
متن کاملDeclining sperm counts in the United States? A critical review.
PURPOSE Recent reports suggest declining sperm counts in the United States. These reports did not include all available data and did not account for geographic variations noted in prior studies. We examined all available data on U.S. sperm counts and evaluated whether geographic variations account for the decline suggested. MATERIALS AND METHODS We reviewed all 29 U.S. studies from 1938 to 19...
متن کاملCounting your sperm before they fertilize: are sperm counts really declining?
A purported global decline in sperm counts has been a source of controversy since the early 1990s. Numerous studies performed since then, as well as reanalysis of the original data, show either no changes, or even increases, in sperm concentrations over time. In this review, we discuss the 1992 meta-analysis that initiated the continuing debate on whether sperm concentrations are declining, and...
متن کاملAre sperm counts declining? Or did we just change our spectacles?
he popular and scientific debates about a possible decline in semen quality over the past decades are largely based on retrospective analyses of semen analysis data performed in the past. This article will argue that the conclusions from such analyses are significantly weakened because the methods of laboratory andrology have changed considerably since the 1950s. In the last 20–30 years, there ...
متن کامل#492 - What Causes Declining Sperm
A month ago, Ms. Kolata savagely attacked the new book, OUR STOLEN FUTURE,[2] claiming that "careful studies" (none of which she cited) had "refuted" the premise of the book. (See REHW #486.) OUR STOLEN FUTURE reviewed hundreds of studies published in peer-reviewed journals. The book offers substantial evidence that industrial pollutants may be interfering with the hormones that regulate growth...
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ژورنال
عنوان ژورنال: BMJ
سال: 1996
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.312.7029.457