Yoga may increase fertility by reducing fertility problems that are caused by stress. It is also believed that using specific yoga poses helps to boost fertility by promoting blood flow to the pelvis, stimulating hormone-producing glands and releasing muscle tension.
Chronic psychological stress increases the production of the stress hormones cortisol and epinephrine in the body, and it causes alpha-amylase enzymes to circulate throughout the body. A study published in the journal Fertility and Sterility found that women who have high levels of both cortisol and alpha-amylase have increased difficulty conceiving, while excess epinephrine constricts uterine blood flow. Hormonal imbalances that are caused by chronic stress can lead to problems with ovulation, as well as egg fertilization and implantation issues in women.
Chronic stress may also lead to impotence in men. A study found that fertility patients who practice yoga styles that are designed to reduce stress, such as hatha or Anusara, increased their fertility by at least 35 percent. Another study found that those who practice yoga regularly have higher levels of the hormone gamma-aminobutyric acid, which helps to regulate mood. Insufficient amounts of gamma-aminobutyric acid have been found to increase anxiety and depression, which can lead to chronic stress.