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Testosterone low, but responsive to competition, in Amazonian tribe — with slideshow
UW anthropologists report that Tsimane men have less baseline testosterone compared with U.S. men, but show the same increase in testosterone following a soccer game.
www.washington.edu
Trumble also pointed out that whereas men in the U.S. show a decline in testosterone as they age, and testosterone drops serve as a sentinel for age-related disease, Tsimane men maintain a stable amount of testosterone across their lifespans and show little incidence of obesity, heart disease and other illnesses linked with older age
Despite lower circulating levels of testosterone under normal conditions, the forager-farmers do have something in common with U.S. men: short-term spikes of testosterone during competition.
Trumble and his co-authors organized a soccer tournament for eight Tsimane teams. The researchers found that Tsimane men had a 30 percent increase in testosterone immediately after a soccer game.
Serum testosterone increases during competition, exercise, etc, which are all forms of stress. A base level of testosterone is needed in order to deal with the stressors of daily life, but obviously avoiding stressors is a much better survival strategy than adapting to them(hence why intelligence is such an unstoppable trait).