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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 3. Individual change in testosterone by age for (A) tree chopping and (B) resting.

Figure 3

Each line segment represents the individual change in testosterone from before to after one hour of (A) tree chopping (n=49) or (B) resting (n=20) centered on the age of the individual. The left end-point of each line is the testosterone before, and the right end-point represents the individual testosterone after one hour of (A) tree chopping, or (B) resting.