MONTREAL Boys will be boys, as the adage goes, with their boisterous rough-and-tumble play so stereotypically male.
Is it the doings of a primary sex hormone called testosterone, long associated with social dominance, masculinity, and strength?
Many scientists have explored the role of hormones and conduct, whether in school playgrounds, sports, war or bedrooms.
Now a Universite de Montreal study of five-month-old twins is among the first to tease out the contribution of genetic and environmental factors to circulating levels of this chemical.
The research with infant twins suggests that the environment plays a more significant role than genes when it comes to testosterone levels.
Studies in human and animal models over the past 50 years have confirmed an association between aggression, dominance, and testosterone in adolescence said lead author Richard Tremblay of UdeM's research unit on children's psychosocial maladjustment.
"The question is, when does that association start" asked Tremblay, whose team looked at newborn babies of both sexes.
Published in the online edition of Psychoneuroendocrinology, the study compared testosterone in saliva samples from a total of 314 infants identical twins with non-identical twins. Identical pairs share the same genes, while fraternal twins are like any siblings and share 50 percent of their genes.
"So if testosterone levels are genetically determined, then the identical twins would be more alike than the fraternal twins," Tremblay explained.
Researchers found that testosterone levels in infancy are not inherited genetically but instead are affected by environmental factors.
- Testosterone drives ego, reduces cooperation - Testosterone Prescription - July 9th, 2019
- Question: What Makes Men Sexy to Women? Answer: Low Stress, High Testosterone, Strong Immunity - Testosterone Therapy - June 23rd, 2019
- Your Life on Testosterone: Overly Sure, Unwilling to Listen to Anyone - June 13th, 2019
- Testosterone linked to heart disease - Testosterone Prescription - June 7th, 2019
- Acidosis: The Hidden Health Destroyer - May 5th, 2019
- Dr Manny: Want to boost your testosterone? Try getting married - Testosterone Prescription - April 29th, 2019
- Low testosterone levels cause health woes - Testosterone Prescription - April 29th, 2019
- Co-sleeping with baby drops men’s testosterone levels - April 15th, 2019
- Testosterone reduces group think, cooperation, and less sheep-like mentality - April 1st, 2019
- Men with higher testosterone tend to lie less, study suggests - April 1st, 2019
- Increase in testosterone drug use - Testosterone Prescription - April 1st, 2019
- Five Myths About Low Testosterone And Testosterone Therapy - Testosterone Prescription - April 1st, 2019
- Hypogonadism Testosterone Archives - Testosterone Prescription - March 30th, 2019
- The top ten testosterone booster supplements: A review - March 28th, 2019
- Testosterone replacement therapy improves symptoms of metabolic syndrome - Testosterone Prescription - March 26th, 2019
- Testosterone shown to help sexually frustrated women- Testosterone Prescription - March 25th, 2019
- Testosterone therapy — good idea or not? - Testosterone Prescription - March 25th, 2019
- Testosterone, Viagra not a winning combination for erectile dysfunction - Testosterone Prescription - March 21st, 2019
- Too much testosterone makes for bad decisions, tests show - Testosterone Prescription - February 27th, 2019
- With testosterone, it's 'my way or the highway': UK study - Testosterone Prescription - February 27th, 2019
Contact Us Now
How useful was this post?
Click on a smiley face to rate it!
Average rating / 5. Vote count:
Word Count: 247