Bhubaneswar, May 27 -- New York: In women with history of miscarriage, higher levels of physical activity have been associated with a greater risk of subclinical, or very early pregnancy loss, warn researchers.

The study, published in the journal Fertility and Sterility, found that there was roughly a two-fold higher risk of very early pregnancy loss for women who were highly active compared to those who were less active.

"Risk related to physical activity is different for pregnancy failure close to the time of implantation compared with that for later, clinical pregnancy loss," said study lead author Lindsey Russo from the University of Massachusetts in the US.

"The implantation period may represent a time of vulnerability, when high-...