Motility characteristics of human sperm, nonfrozen and cryopreserved

B. A. Keel, A. M. Karow

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Ejaculates (1651) obtained by masturbation from 88 donors were evaluated for count, motility, and kinetics. After the initial evaluation the ejaculates were frozen in liquid nitrogen, thawed 24 hr later, and assessed for postthaw motility and kinetics. The ejaculates were then divided into seventeen groups according to sperm count and evaluated to determine if direct relationships exist between prefreeze and thawed seemen characteristics. The average sperm count was 151 × 106 sperm/ml. The freezing process resulted in a reduction of motility from a mean of 85% to a mean of 52%. Postthaw motility increased with sperm count up to 120 × 106 sperm/ml where there appeared to be no further effect. Linear regression analysis demonstrated a high correlation between prefreeze motility and postthaw motility (r = 0.947). Cryopreservation of human spermatozoa results in a significant reduction of motility. A direct relationship exists between prefreeze and postthaw motility and prefreeze motility may be an important factor in evaluating the potential of an ejaculate to withstand cryopreservation.

Original languageEnglish (US)
Pages (from-to)205-212
Number of pages8
JournalSystems Biology in Reproductive Medicine
Issue number3
StatePublished - 1980
Externally publishedYes


  • Nonfrozen and cryopreserved sperm
  • Sperm
  • Sperm kinetics
  • Sperm motility

ASJC Scopus subject areas

  • Reproductive Medicine
  • Urology


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