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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Evol Hum Behav. 2013 Jul 23;34(5):10.1016/j.evolhumbehav.2013.06.002. doi: 10.1016/j.evolhumbehav.2013.06.002

Figure 1.

Figure 1

presents the distributions of percent change in testosterone after one hour of tree chopping (n=51) and one hour of soccer (n=82).