The Globe and Mail
Paul Waldie
http://www.theglobeandmail.com/sports/hockey/for-the-jets-home-is-where-the-testosterone-is/article2370910/

Researchers say there's much more to the story than just noisy fans. "There are a variety of reasons" teams do well at home, said Justin Carré, an assistant professor of psychology at Wayne State University in Detroit and a former U.S. college hockey player. He cited referee bias, travel, crowd density, familiarity with surroundings and something else: biology.

Carré has done studies on hockey players that show their testosterone level increases significantly before home games. Testosterone levels were also higher after victories at home than on the road, his studies showed. Other research has shown players can increase their testosterone levels by watching a video of their team winning. But if that happens before a road game, Carré has found that players actually perform worse than at home. He isn't sure why, but he suspects that the aggressive play turns into penalties on the road and smarter plays at home.

This may seem a little tangential to trans issues, but I think it's interesting to see how testosterone and estrogen work in general, and I feel it helps with getting a better handle on being trans.