"Do we need to update IVF protocols to use semen from shorter periods of
abstinence?"
Introduction: Men have usually been advised to limit sexual activity to increase the chances of pregnancy. A new study suggests sperm quality and pregnancy outcomes in IVF may be improved with frequent ejaculation,
Summary: Research carried out Da Li et aVaimed to determine the effects of a short period of abstinence on the quality of ejaculated sperm, as well as its effect on the pregnancy outcomes of 500 couples undergoing EVE Major molecular differences were seen between samples of semen depending on the duration of abstinence. Ejaculates from short (1-3 hours) compared with long (3-7 days) periods of abstinence showed increases in motile sperm count, sperm vitality, normal sperm morphology, acrosome reaction capacity, total antioxidant capacity, sperm mitochondria' membrane potential, high DNA stainability and a decrease in the sperm DNA fragmentation index (P<0.05). Sperm proteomic analysis showed 322 differentially expressed proteins (minimal fold change of ±1.5 or greater and P < 0.05), with 224 up-regulated and 98 down-regulated. These differentially expressed proteins are profoundly involved in specific cellular processes, such as motility and capacitation, oxidative stress and metabolism. Interestingly, protein trimethyllysine modification was increased and butyryllysine, propionyllysine and malonyllysine modifications were decreased in ejaculates from a short versus long abstinence (P < 0.051 Finally, the rates of implantation, clinical pregnancy and live births from in vitro fertilization treatments were significantly increased (by one-third in this study) in semen samples after a short abstinence. This study provides preliminary mechanistic insights into improved sperm quality and pregnancy outcomes associated with spermatozoa retrieved after a short ejaculatory abstinence.
Conclusion: These results collectively suggest that having more frequent sex produces sperm of a better quality and increases the likelihood of a successful pregnancy. Specifically, semen samples collected after only one to three hours of abstinence contained more motile sperm with a higher reproductive potential than samples collected after men who had abstained for three to seven days.
Source: https://www.indianfertilitysociety.org/fertility-news-october-2018-volume-3/
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