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Serious Cycling May Affect Male Fertility, Says Study

Image of cycling and male fertility
But don't give up your bike quite yet

by Leigh Ann Woodruff, May 24, 2012

Men, if you're a serious cyclist, you may want to downgrade your level of participation to recreational if you and your partner are trying to get pregnant. A new study out of the UCLA School of Nursing found that serious leisure male cyclists may experience hormonal imbalances that could affect their reproductive health.

"Although preliminary, these findings warrant further investigation to determine if specific types of exercise may be associated with altered sex hormone levels in men that could affect general health and reproductive well-being," says Leah Fitzgerald, Ph.D., FNP-BC, assistant professor at the School of Nursing and senior author of the study, which was published in the European Journal of Applied Physiology.

While many have theorized that cycling can affect male fertility because increased scrotal temperature can reduce sperm production, researchers at UCLA investigated the association between exercise intensity and circulating levels of the reproductive hormones, such estrogen and testosterone, in serious leisure male athletes (triathletes and cyclists) and recreational athletes. There were 107 healthy male athletes, ages 18 to 60, who participated and filled out the International Physical Assessment Questionnaire to obtain an objective estimate of time spent participating in different levels of physical activity and inactivity during the previous seven days. The researchers divided the participants into three groups — 1) triathletes, 2) cyclists and 3) recreational athletes.

Is High FSH Associated with Increased Miscarriages?

A recently published study offers optimistic news to young women with high FSH or diminished ovarian reserve who achieve pregnancy with IVF. High FSH is not associated with miscarriage in women under 35, and there is no indication that it is associated with higher levels of aneuploidy.

The Power of IVF with Pre implantation Genetic Screening (PGS)

a blog by Dr. Michael DiMattina, Dominion Fertility, March 5, 2015

Here is an interesting patient of mine who used PGS, taking advantage of the cutting edge reproductive technologies available today to have a healthy baby. Now, she is gearing up for her second pregnancy again using IVF and PGS. Here’s her very fascinating story.

Tubal Factor Infertility


a blog by Dr. Mark Payson, Dominion Fertility, July 7, 2014

“Ana” started crying. We had just reviewed the results of her initial fertility evaluation and the results indicated that her fallopian tubes were blocked. Her husband’s sperm count was also a little low, but she focused on her own “failure” with “broken tubes.”

Tubal factor infertility – or any situation in which the fallopian tubes are nonfunctioning (blocked, absent, dilated, etc) is one of the most common causes of infertility. It can be due to an infection in the past, a history of appendicitis, the presence of fibroids, a prior surgery, even sometimes after delivery or cesarean section. Some women will have no history of any of the above and still have blocked tubes, or may have had an infection as a teenager that was never recognized.

Report Your Pregnancies and Births to the Sperm Bank, Please

a blog by Michelle Ottey, PhD, Laboratory Director for Fairfax Cryobank, July 3, 2014

Sperm banks rely on parents via sperm donation to report successful pregnancies and births to track the number of families attributed to each donor. There are numerous ways to report: call, email, online forms, etc. Almost all sperm banks now have an internal limit on the number of families per donor, but the only reliable way to track that is through recipient self-reporting. Your information is confidential; it will not be released to the donor or anyone else.

Is Donor Sperm Safe?

a blog by Michelle Ottey, PhD, Laboratory Director for Fairfax Cryobank, June 24, 2014

One of the questions I am asked most frequently is, “Is the donor sperm safe?” Women want to ensure that the sperm sample being used for their insemination is safe and will not put them or their potential child at risk.

Is it Worthwhile to Test IVF Patients for Ureaplasma?

a blog by Dr. Michael DiMattina, Dominion Fertility, April 10, 2014

Hi everyone. Dr. DiMattina here to discuss the clinical issue of ureaplasma in infertility patients undergoing in vitro fertilization (IVF).

Studies show that this organism is often found on the cervix of 17 to 25% of patients with infertility. Cervical testing may be limited in detecting the presence of ureaplasma and many patients also have the bacterium present in the endometrial cavity regardless of whether or not it is present or detected on cervical testing. Detection of ureaplasma in the endometrial cavity is limited. Data from many studies suggest that untreated cervical or endometrial ureaplasma may lead to implantation failure or possibly spontaneous abortion but admittedly, much of the data comes from older literature.

Limitations of AMH to Determine Ovarian Reserve

New information is available about the limitations of the current assay for serum Antimullerian Hormone (AMH) for determination of your ovarian reserve.

A recent study published in the February, 2014 journal of Fertility and Sterility evaluated the current assay used to determine serum AMH and found that the values obtained in the newer current assay may be flawed, resulting in significant clinical implications for patients who are told they have decreased ovarian reserve when, in fact, they may not.

Top 3 Natural Cycle IVF Patient Questions Answered

natural cycle ivf

Dominion Fertility’s Medical Director Dr. Michael DiMattina answers patients' most pressing questions when it comes to Natural Cycle In Vitro Fertilization.


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