TABLE 1.

Details of the 8-week chronic disruption of rhythms protocol.

Week	Days	24 h condition to initiate phase delay in CDR group	Lights on	Lights off
1	0–6	24 h dark ending at 1800 h MDT or 1900 h MST on day 0	1800 h MDT or 1900 h MST	0600 h MDT or 0700 h MST
2	7–13	24 h light ending at 1800 h MDT or 1900 h MST on day 7	0600 h MDT or 0700 h MST	1800 h MDT or 1900 h MST
3	14–20	24 h dark ending at 1800 h MDT or 1900 h MST on day 14	1800 h MDT or 1900 h MST	0600 h MDT or 0700 h MST
4	21–27	24 h light ending at 1800 h MDT or 1900 h MST on day 21	0600 h MDT or 0700 h MST	1800 h MDT or 1900 h MST
5	28–34	24 h dark ending at 1800 h MDT or 1900 h MST on day 28	1800 h MDT or 1900 h MST	0600 h MDT or 0700 h MST
6	35–41	24 h light ending at 1800 h MDT or 1900 h MST on day 35	0600 h MDT or 0700 h MST	1800 h MDT or 1900 h MST
7	42–48	24 h dark ending at 1800 h MDT or 1900 h MST on day 42	1800 h MDT or 1900 h MST	0600 h MDT or 0700 h MST
8	49–55	24 h light ending at 1800 h MDT or 1900 h MST on day 49	0600 h MDT or 0700 h MST	1800 h MDT or 1900 h MST

CDR, chronic disruption of rhythms; MDT, Mountain Daylight Time; MST, Mountain Standard Time.