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Does smoking during pregnancy affect sons' sperm counts?

Lone Storgaard1, Jens Peter Bonde, Erik Ernst

  • 1Department of Occupational Medicine, Aarhus University Hospital, Denmark. lstor@akh.aaa.dk

Epidemiology (Cambridge, Mass.)
|July 16, 2003
PubMed
Summary
This summary is machine-generated.

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Maternal smoking during pregnancy, particularly over 10 cigarettes daily, significantly reduced sperm density and total sperm counts in adult sons. This finding may explain declining sperm quality trends.

Area of Science:

  • Reproductive Health
  • Environmental Epidemiology
  • Human Reproduction

Background:

  • Denmark has observed a decline in sperm density over five decades.
  • Danish women exhibit high rates of smoking in Europe.
  • The study investigates the impact of maternal smoking during pregnancy on male offspring's semen quality.

Purpose of the Study:

  • To examine the relationship between maternal tobacco smoking during pregnancy and semen quality in adult males.
  • To assess the association between prenatal smoke exposure and male reproductive hormones.

Main Methods:

  • Utilized data from the Danish Twin Registry and Civil Registration System.
  • Collected semen and blood samples from 316 men between November 1999 and May 2000.
  • Obtained prenatal tobacco exposure data from maternal questionnaires for 265 participants.

Related Experiment Videos

Main Results:

  • Sons of mothers smoking >10 cigarettes/day during pregnancy had 48% lower sperm density.
  • Reduced total sperm counts and inhibin-B levels were observed in this group.
  • Higher follicle-stimulating hormone levels were noted, though not statistically significant.

Conclusions:

  • High maternal smoking (>10 cigarettes/day) during gestation is linked to reduced sperm counts in sons.
  • This exposure may partially explain the observed secular decline in sperm density.
  • Findings highlight potential environmental impacts on male reproductive health across generations.