Fig. 1.

Long-term housing under non-24 h LD cycles drives phase desynchrony between physiological rhythms and the LD cycle. a Representative body temperature (T _b) rhythms from mice maintained on 20, 22.5, 24, 27 and 30 h LD cycles. Top panels are double plotted relative to LD cycle time; bottom panels are plotted on 24 h frequency. b Group T _b profiles across the LD cycle (derived from 10 consecutive cycles, after 40 d LD exposure) highlight the delayed (22.5 h) and advanced (27 h) phase of entrainment in non-24 h LD housed mice. Data in b reflect mean ± SEM, n = 7/group for 20 and 30 h LD; n = 10/group for 22.5, 24 and 27 h LD