Figure 1
Representative actograms of F344 and HSD rats. (a) F344 rat in LD, (b) HSD rat in LD, (c) F344 rat in SD, (d) HSD rat in SD, (e) F344 rat in DD, (f), HSD rat in DD, (g) arrhythmic HSD rat in DD.
Figure 2
Proportion of rats active in relation to time of day (Mean +/- SEM). (a) F344 in LD, (b) HSD in LD, (c) F344 in SD, (d) HSD in SD, (e) F344 in constant dark, and (f) HSD in constant dark. The profiles show the proportion of individual rats active on the running wheel during each hour, averaged over the final four days of activity monitoring. For rats in constant dark, activity was fit to the 24 hour profile by placing the zero time point at the midpoint of activity.
Figure 3
Circadian parameters for F344 (F) and HSD (H) rats in LD, SD, and DD (Mean +/- SEM). (a) nocturnality index, (b) alpha, the duration of activity, (c) activity onset, with dashed lines indicating the time of lights off, (d) activity offset, with dashed lines indicating the time of lights on, (e) phase angle of entrainment, and (f) tau, the free-running rhythm in DD. Asterisks indicate significant differences between F344 and HSD rats.