Navigation Links
Can Crotch Length Predict Sperm Strength?
Date:3/4/2011

By Amanda Gardner
HealthDay Reporter

FRIDAY, March 4 (HealthDay News) -- New research contends that the distance between the posterior base of the scrotum and the anus can predict the strength of a man's sperm population.

Men who have a shorter perineal length, also known as the anogenital distance (AGD), have lower sperm counts, poorer quality sperm, lower sperm concentrations and lower motility, the study has found.

Although scientists had long ago made the connection between AGD and fertility in male rats, this is the first time it's been shown in humans, said the researchers, whose findings are published in the March 4 edition of the journal Environmental Health Perspectives.

In rats, the same group of researchers established that shorter AGD and male reproductive problems were linked to exposure in the womb to a class of endocrine-disrupting chemicals called phthalates, which are used to make plastics more flexible and are found in many toys and other household products.

Phthalates disrupt normal testosterone exposure in the womb, among other things, and have been linked to fertility problems in women and abnormal breast growth in boys.

The new study did not examine phthalate exposure in the subjects or their mothers, but by making a connection between shorter AGD length (linked in male rats to exposure to phthalates) and lower sperm counts, it does provide indirect evidence that exposure to such chemicals may result in lower sperm counts in adult men, according to the authors.

The researchers took two measures of AGD, along with sperm count and concentrations, sperm shape and sperm motility, in 126 college students in upstate New York.

The first measure was from the underside of the scrotum to the anus and the second was from the top of the penis stem to the anus.

The shorter measurement -- starting at the underside of the scrotum -- was associated with sperm count, sperm concentration and motility. The longer measurement was not.

The median AGD was about 52 millimeters so men who had an AGD below this level were more than seven times more likely to have low sperm concentration in the subfertile range.

Twenty-five percent of the sample "had sperm concentrations that would have sent them to a doctor for an infertility work-up," said study senior author Shanna H. Swan, professor and associate chair of obstetrics and gynecology at the University of Rochester Medical Center.

Biologically speaking, the shorter AGD reflects lower exposure to testosterone in the womb, which can affect full development of the genital tract in males, affecting both this size measurement and sperm quality, she explained.

Swan and the other researchers have noted that an association between the volunteers' lower sperm counts and phthalates exposure in the womb is "speculative," but one that warrants further investigation.

Meanwhile, in fertility screening, AGD may prove to have advantages over other factors that affect sperm count. Unlike other variables that affect semen quality, such as stress, having had a fever recently and even outside temperature, "AGD is forever," Swan said, making any predictions more accurate.

And if the sperm count is merely low (as opposed to non-existent), taking out a ruler and measuring may "help the prediction of whether he's going to be successful [getting a woman pregnant]," Swan said.

But, she stressed, "we need a lot more men to get normative values. We need to have a couple of thousand to say what you would expect in the general population."

One expert agreed that more research was needed to determine AGD's possible use as a marker for fertility problems in healthy men.

"We don't have good ways to predict future fertility unless there are major abnormalities," said Dr. Sheela Sathyanarayana, assistant professor of pediatrics at the University of Washington and Seattle Children's Hospital, who was not involved in the study.

"This could potentially be used in the future as a marker for sperm concentration and motility," Sathyanarayana said, "[but] more research groups would need to trial this out and look to see if there are differences in AGD between men who are fertile and men who are infertile."

More information

The U.S. National Institute of Child Health and Human Development has more about fertility and infertility.

SOURCES: Shanna H. Swan, Ph.D., professor and associate chair, obstetrics and gynecology, University of Rochester Medical Center, Rochester, N.Y.; Sheela Sathyanarayana, M.D., assistant professor, pediatrics, University of Washington and Seattle Children's Hospital; March 4, 2011, Environmental Health Perspectives


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Study: Happiness improves health and lengthens life
2. Diet High in Fiber Might Lengthen Your Life
3. Finger length points to prostate cancer risk
4. Close Ties With Others Might Lengthen Life, Review Finds
5. Study: Medicare policy may account for growing length of hospice stays in nursing homes
6. Length of biological marker associated with risk of cancer
7. Shorter Telomere Length Again Linked to Cancer
8. Antibody therapy lengthens survival of metastatic melanoma patients in large clinical trial
9. Texas Childrens Cancer Center first in Texas to magnetically lengthen 9-year-olds leg as she grows
10. Cosmetic Peptides that Significantly Reduce Length and Depth of Wrinkles: Janet Sartin Introduces Advanced Anti-Wrinkle Peptide Serum for All Skin Types
11. Unequal leg length tied to osteoarthritis, says Queens professor
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Can Crotch Length Predict Sperm Strength?
(Date:5/31/2016)... , ... May 31, 2016 , ... Super Powder, a ... to on the go individuals and dedicated athletes, continues to transform the nutritional supplement ... with whey, pea and milk protein, branched-chain amino acids (BCAA), alkaline minerals, wheat grass, ...
(Date:5/30/2016)... Salt Lake City, Utah (PRWEB) , ... May ... ... health insurance reimbursement for small businesses, announced today the publication of an original ... helps business owners and health insurance professionals understand how Zane Benefits complies with ...
(Date:5/29/2016)... ... May 29, 2016 , ... Whole Health Supply is ... that has been available via Amazon.com. This new style of nail clipper has ... The jaw opening is approximately 4mm and the actual handle is 2.5mm thick to ...
(Date:5/28/2016)... ... , ... SuperCloset is proud to officially launch our “Helping Veterans Grow ... and obstacles veterans’ need to overcome in order to face their life changes upon ... veteran(s) with a donated SuperCloset product based on the needs and ability of helping ...
(Date:5/28/2016)... ... 28, 2016 , ... After a year and a half of planning the Multiple Pathways ... The Multiple Pathways of Recovery Conference was held May 2 -4, 2016 at the ... Kingdom came together to explore the many pathways individuals use to get into and sustain ...
Breaking Medicine News(10 mins):
(Date:5/30/2016)... , May 30, 2016 On ... eliminate viral hepatitis by 2030. At the 69 th ... ever Global Viral Hepatitis Strategy, signalling the greatest global commitment ... a goal of eliminating hepatitis B and C by 2030 ... if reached, will reduce annual deaths by 65% and increase ...
(Date:5/27/2016)... 27, 2016  A new study highlights the necessity of health literacy within the ... the American College of Radiology , a majority of oncology patients undergo imaging screenings ... http://photos.prnewswire.com/prnh/20160527/373022 ... ... Medical Diagnostic Imaging Ampronix ...
(Date:5/27/2016)... 27, 2016 Kitov ... focused on late-stage drug development, today announced the ... of pivotal batches required for registration of KIT-302 ... This follows Kitov,s announcement in December ... met its primary efficacy endpoint. "We ...
Breaking Medicine Technology: