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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Physiol Behav. 2014 Nov 9;139:127–135. doi: 10.1016/j.physbeh.2014.11.002

Table 2.

Comparison of plasma levels of ACTH (pg/ml), corticosterone (CORT, ng/ml) and prolactin (ng/ml). Four groups of animals: (1) H-RI, the heroin SA rats with “high” reinstatement induced by acute foot shock stress; (2) L-RI, the heroin SA rats with “low” reinstatement induced by acute foot shock stress; (3) NR, the rats below the criterion for acquisition of heroin SA (20 infusions on days 5–7 of SA testing, 0.05 mg/kg/infusion); and (4) Stress control, saline SA rats without acute foot shock stress (n = 6–10). Shown are the mean levels measured 45 min after 15-min intermittent foot shock stress on day 16 (9 days after heroin SA), and in the Stress control group.

Group
H-RI L-RI NR Stress control
ACTH 442 ± 51# 375 ± 46# 426 ± 61# 219 ± 30
CORT 653 ± 102# 723 ± 124# 528 ± 101# 204 ± 22
Prolactin 7.4 ± 0.7#* 5.4 ± 0.6 5.1 ± 0.8 3.7 ± 0.5
#

p<0.05 vs. Stress control;

*

p<0.05 vs. L-RI group.