Wheel-running activity records and peak plasma CORT values of wild type mice in 8L:14D.

<p>(a) An animal that re-entrained to 8L:14D quickly with activity onsets <1 hour delayed after light offset. (b) An example of an animal that required ≈2 months to re-entrain to 8L:14D with activity onsets delayed>5 h after light offset. (c) Peak plasma CORT values of mice with Ψs≤4.2 h delayed (n = 12) as illustrated by example in panel (a). (d) Peak plasma CORT values of mice with Ψs≥5.4 h delayed (n = 7) as illustrated by the example in panel (b). CORT values of animals with a Ψ≥5.4 h delayed were significantly less than CORT values of animals with a Ψ≤4.2 h delayed (p<0.03).