Table 3.

Plasma levels of corticosterone and ACTH in response to 90 min. restraint stress. SED: rats housed under sedentary conditions for the duration of the experiment (n = 18). RUN: rats housed with constant access to a running wheel for 6 weeks (n = 16). Values represent the group mean ± 1 s.e.m.

Exercise	Time (min.)	ACTH (pg/ml)	Corticosterone (μg/dl)
SED	0	36 ± 2.3	1.5 ± 0.5
SED	30	323 ± 43.7†	20.8 ± 1.9†
SED	90	101 ± 20.6†	13.1 ± 2.4†
RUN	0	37 ± 2.3	1.8 ± 1.1
RUN	30	258 ± 34.9†	13.4 ± 2.2†
RUN	90	56 ± 11.0†	7.6 ± 2.8*

^*p < 0.05

^†P < 0.01 with respect to appropriate baseline (time = 0 min.) group.