January 29, 2014 |
Men over 65, as well as younger men with diagnosed heart disease, were at least twice as likely to have non-fatal heart attacks in the 90 days after they were prescribed testosterone medication than were men of the same age and health status who did not get the hormone supplement, a study has found. For men under 65 with no diagnosis of cardiovascular disease, testosterone supplementation did not appear to raise heart attack risk, the study suggests. But among men older than 65, many of whom may have had undiagnosed risk factors, rates of non-fatal heart attack rose as much as threefold in the 90 days after they filled a prescription for testosterone medication.
July 30, 2012 |
Of all the obstacles athletes have had to overcome to compete in the Olympics, perhaps the most controversial has been the gender test. Originally designed to prevent men from competing in women's events, it is based on the premise that competitors can be sorted into two categories via established scientific rules. But the biological boundaries of gender aren't always clear. Consider the Spanish hurdler Maria Jose Martinez-Patiño. A gender test revealed that she had a Y chromosome, which normally makes a person male.
May 8, 2012 |
World Boxing Assn. and International Boxing Federation junior welterweight champion Lamont Peterson has tested positive for synthetic testosterone, jeopardizing his May 19 title defense against England's Amir Khan at Mandalay Bay in Las Vegas, said Keith Kizer, executive director of the Nevada State Athletic Commission, and Peterson's promoter, Richard Schaefer. Kizer and Schaefer confirmed the positive result for synthetic testosterone and are now awaiting a letter Tuesday explaining the result from Peterson's attorney, both men said.
September 12, 2011 |
Hormonally speaking, becoming a father may make you less of a man, according to new research that finds testosterone levels drop in men after they become parents. But fear not for manhood — the results show that men are evolutionarily wired to help raise their children and that testosterone may get in the way, scientists say. Testosterone is a hormone associated with perceived hallmarks of masculinity such as libido, aggression and musculature. Those can be useful qualities when competing for a mate, but less so when raising a child — an endeavor that requires calm, attentiveness and an even temper.
September 10, 2010
What makes a corporate merger go bad? Is it a dramatic change in stock price? A revelation about an unprofitable business unit? Resistance from federal regulators? Researchers from the University of British Columbia propose another explanation – too much testosterone . Maurice Levi, Kai Li and Feng Zhang of the university’s Sauder School of Business came up with their theory based on prior research showing that the male sex hormone affects the way men play the ultimatum game . In one version of this game, Player A was asked to divide up $40 between himself and Player B – he could choose either a $35-$5 split, or a $15-$25 split.
August 25, 2010
A chemical found in plastics has been shown to increase testosterone levels in men, British researchers reported on Wednesday. They found that men who had high levels of the chemical bisphenol A also had higher testosterone levels compared to men with lower levels of the chemical in their bodies. The chemical, also known as BPA, is commonly found in plastic products around the world. The new study comes on the heels of research released earlier this month that found high amounts of BPA are present in everyday cash register receipts , as much as 3% of the total weight of the receipt.