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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Drug Alcohol Depend. 2015 Sep 28;156:193–198. doi: 10.1016/j.drugalcdep.2015.09.022

Figure 2.

Figure 2

Timeline for Experiment 2 in which the effect of exercise on nicotine self-administration under a progressive ratio schedule in adolescent rats was examined. Following self-administration acquisition and stable baseline PR responding, adolescent rats were given 2-hour access to their exercise or sedentary condition each day prior to the PR session for 5 days. The persistent effect of exercise was determined in 3 post-exercise sessions, in which the rats did not have access to sedentary or exercise conditions prior to PR sessions.