Many women are concerned about menstrual cycle changes caused by COVID-19 vaccines. And it is that several studies have associated these injections with heavier bleeding or with a longer cycle duration. Now, a new investigation has revealed that the key to avoiding these alterations in the period would be to choose the moment in which to give the injection, specifically, they recommend inoculating the doses after the ovulation period.
The authors of this study, which has been coordinated by the Artificial Intelligence Research Institute (IIIA-CSIC), highlight the protective role that ovulation control could have when getting the coronavirus vaccine. As they explain, doing it in the luteal phase – the time between ovulation and the menstrual cycle – would help prevent the menstrual cycle from lasting longer.
In the work, 1,855 cycles of 371 women who provided this data through a mobile application called App Lunar that monitors the menstrual cycle have been analyzed. The data collected were the length of the cycle, time with the period, variations in bleeding and intensity level of perceived pain.
One more day of cycle when vaccinated before ovulation
The results, which have been published in the American Journal of Obstetrics and Gynecology, indicated that of all the study participants who had been vaccinated in the follicular phase, 11% had an increase in the length of their menstrual cycle of more than eight days, a clinically important value.
11% of women vaccinated before ovulation saw their menstrual cycle increased by more than eight days
Borja Velasco, coordinator of the project, has stated that in addition “it was observed that people who had been vaccinated during the follicular phase, that is, before ovulation, presented an average increase in the duration of the cycle of one day, while people who had been vaccinated during the luteal phase did not show any increase.
The findings were found across different types and brands of vaccines, and, according to the authors, is a major discovery on a subject for which there is little scientific evidence. The experts would like more research to be carried out in this regard to corroborate these results and to be able to respond to all those women who are reluctant to vaccines due to the possible changes in the menstrual cycle that they could bring about.
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