Male testosterone levels increase after winning competition with rivals, but not friends

Recommended by Dr. Michael White, Updated on January 5th, 2018

Washington, May 15 (ANI): A new University of Missouri study has found that testosterone levels during group competition are modulated depending on the relationships among the competitors and may be related to the formation of alliances in warfare.

"One interesting thing about humans is that we are the only animal that competes in teams," said Mark Flinn, professor of anthropology at MU.

"Our hormonal reactions while competing are part of how we evolved as a cooperative species. What we found in our study is that although male's testosterone levels increase when men are victorious against strangers or rivals, levels of the hormone tend to stay the same when competing against friends," he stated.

Flinn and his research team studied males from varying age groups on the island of Dominica while they played dominoes or cricket. Flinn found that when males competed against a group outside of their community, their testosterone levels rose during and after competition if they won, but diminished following a defeat. However, when males competed with their friends, their testosterone levels did not change in response to victory or defeat.

Competing in sport coalitions can raise testosterone levels in males, but males don't have to be competing in order to see a rise in testosterone.

Flinn said that when watching a favorite sport team the viewer is a part of a coalition of fans in the community and can also get a rise in testosterone levels while watching games.

He suggests that coalitions may have had important effects on the evolution of human social psychology.

Members of Flinn's research team include Davide Ponzi, now a postdoctorate at the University of Chicago, and Michael Muehlenbein, associate professor of anthropology at Indiana University. (ANI)

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Male testosterone levels increase after winning competition with rivals, but not friends

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