Miscarriage Over 40 Prevention - Go Easy On ExerciseI have always suspected that too much exercise will not only affect your ability to get pregnant, but also your ability to stay pregnant (especially in early pregnancy). I actually address this in my book. I don't know the science behind it, but it just makes logical sense to me that if your body is bouncing around with high impact exercise, it would be harder for an embryo to "take hold" and implant the way it should. So many sources basically dismiss any association between exercise and miscarriage. However, this article talks about a study that was done on exercise in early pregnancy and how it does seem to increase the risk of miscarriage:
After collecting the data about the participants, the researchers compared women who did not take any exercise at all with those who exercised more than seven hours a week or played “high-impact” sports, such as ball games and racket sports.
It was found that women who played "high-impact" sports or who exercised for more than seven hours a week were approximately three-and-a-half times more likely to miscarry.
The researchers also found that miscarriage was far rarer later in pregnancy, and that the association between exercise and miscarriage disappeared
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"The results of this study suggest that leisure time exercise during pregnancy, and particularly high-impact exercise, is associated with an increased risk of miscarriage in the early stage of pregnancy," the BBC quoted the authors of the study as writing in the British Journal of Obstetrics and Gynaecology.
However, the study has also shown that swimming, which is one of the most popular exercises among pregnant women, does not increase the risk of miscarriage.