Showing posts with label Androgens. Show all posts
Showing posts with label Androgens. Show all posts

Friday, 29 March 2013

Should Short Boys Take Growth Hormone?

If they're healthy, probably not, experts say

HealthDay news image
WEDNESDAY, March 27 (HealthDay News) -- Parents often worry when their child, especially a son, is much shorter than average. But as long as there is no medical cause, parents can rest easy, experts say.Writing in the March 28 New England Journal of Medicine, two pediatric endocrinologists describe a scenario pediatricians see all the time: Parents bring in their 11-year-old son because he's substantially shorter than his classmates, and his growth seems to have slowed in recent years.
Their concern is reasonable, said Dr. David Allen, co-author of the article and a professor of pediatrics at the University of Wisconsin School of Medicine and Public Health in Madison.
In the vignette, Allen and Dr. Leona Cuttler describe a boy whose height was in the third percentile at age 9 years. (That means he was shorter than 97 percent of boys his age.) But his growth rate slowed further, so that he is now in the first percentile for height.

Thursday, 28 March 2013

Sex Steroids and Bone

Juliet E. Compston

Sex steroids are essential for skeletal development and the maintenance of bone health throughout adult life, and estrogen deficiency at menopause is a major pathogenetic factor in the development of osteoporosis in postmenopausal women. The mechanisms by which the skeletal effects of sex steroids are mediated remain incompletely understood, but in recent years there have been considerable advances in our knowledge of how estrogens and, to a lesser extent androgens, influence bone modeling and remodeling in health and disease. 

New insights into estrogen receptor structure and function, recent discoveries about the development and activity of osteoclasts, and lessons learned from human and animal genetic mutations have all contributed to increased understanding of the skeletal effects of estrogen, both in males and females. 

Wednesday, 9 May 2012

Why your sex drive won't decline with age

Research suggests women feel less sexy the longer they stay in a relationship - I don't believe it

Couple lying in bed, woman with pensive expression on face


Commentators would have us believe that a woman’s sex drive declines faster than a man’s.
Or, put another way, a woman’s sex drive dwindles over time whereas a man’s stays on the up and up.
I don’t believe a word of it. Research from the University of Guelph in Canada suggests the theory that women feel less sexy the longer they stay in a relationship. But that doesn’t mean that her basic sexual urges are declining.

Sunday, 25 March 2012

Why Can’t Women Dunk?

By Dean Schabner
ap britney griner dunk jt 120325 wblog Why Cant Women Dunk?


Well, as Baylor University’s Brittney Griner so demonstratively proved twice this week, they can dunk, but they sure don’t do it very often.

When Griner, a 6-foot-8 junior, dunked Tuesday in Baylor’s 76-57 victory over Florida, she became just the second woman to dunk in an NCAA tournament game — and the first since 2006. When she dunked again Saturday in an 83-68 victory over Georgia Tech, she tied the record for most dunks by a woman in the tournament.
Griner, who has recorded double-doubles in 100 of her 102 college games and is the first player to score 2000 points and block 500 shots in her career, hardly needs to dunk to be imposing, but her coach says it wouldn’t hurt.
“I think she’s gotten away from trying to be monstrous with her going to the rim,” Baylor coach Kim Mulkey said after the game Tuesday. “I told her about two weeks ago — I said: ‘Even if you miss it, it sends a message.’”
The last woman to dunk in the tournament was Candace Parker of Tennessee, who threw it down twice in a game in 2006 against Army.
Griner’s dunk Tuesday was her first of the season, and with the one Saturday, she has seven in her career, tying Parker for the record for a woman’s college player.
But a dominant 6-foot-8 male player might dunk seven times in a game. So what’s the difference?
According to Dr. Linn Goldberg, a professor of medicine and head of the Division of Health Promotion and Sports Medicine at the Oregon Health and Science University, it likely has to do with differences in height, muscle types and attitude.
Goldberg pointed out that it is not only on the basketball court where we see the difference: In the high jump, the men’s record is almost 17 percent higher than the women’s.
The key to strength, speed and power are activated fast twitch or Type II muscle fibers, especially type IIb, Goldberg said. Men have more muscle mass, in part due to the amount of testosterone, which is a naturally produced anabolic steroid, and thus they have more Type IIb muscle mass.
“Although women do produce some androgen, it is a small amount compared to males, and thus they have less muscle strength and power to jump,” Goldberg said. “Testosterone not only increases muscle mass, it also increases the size of motor neurons, which induces more power, which is needed for jumping ability.”
Size matters too — since women are not generally as tall as men — but there is obviously still a difference between men and women of the same height, and Goldberg said another factor could be the female mind-set vs. the male.
“I imagine many more women would be able to dunk, but either don’t take the opportunity or know full well that a dunk is worth no more points than a layup, a jump shot from within the 3-point perimeter, and less points than a 3-point shot,” Goldberg said.
“I may be off the mark, but in general, women are less ‘sensation-seeking’ than men, and thus may understand that they will not get more points for a dunk, makes them less likely to do something that in the end achieves nothing else but entertainment for the crowd,” he said.