title: [Effect of successive ejaculation on semen analysis parameters in normal men].
abstract: OBJECTIVE
  To study the effect of successive ejaculation on semen analysis parameters in normal men.
  
  
  METHODS
  Eight ejaculates were collected at daily intervals from 8 normal men. The semen parameters were analyzed according to WHO laboratory manual for the examination of human semen and sperm-cervical mucus interaction.
  
  
  RESULTS
  The semen volumes and total sperm counts decreased gradually day by day, significantly lower from the 5th to the 8th day than the 1st (P < 0.01). The sperm densities also declined day by day, but not significantly. The sperm viability and motility (a + b grade) presented an increasing trend, but with no significance except on the 7th day.
  
  
  CONCLUSIONS
  With the increase of the ejaculatory frequency, human semen volumes and the total counts significantly decrease, while sperm viability and motility gradually increase. Successive ejaculation does not affect the quality of human semen.
authors.affiliation: National Research Institute for Family Planning, Beijing 100081, China.
authors.forename: Kaiyan
authors.initials: K
authors.lastname: Pei
authors.forename: Yabin
authors.initials: Y
authors.lastname: Xu
authors.forename: Mengchun
authors.initials: M
authors.lastname: Jia
mesh_terms: D000328:Adult; D004542:Ejaculation / Q000502:physiology*; D006801:Humans; D008297:Male; D012661:Semen / Q000502:physiology*; D013076:Sperm Count; D013081:Sperm Motility