Table 3.
Bout analysis of wheel-running by photoperiod in the 18HR environmental CD.
| 6HR dark | 12HR dark | 18HR light | 12HR light | |||||
|---|---|---|---|---|---|---|---|---|
| CT | CD | CT | CD | CT | CD | CT | CD | |
| Avg bout length | 18.2 (3.6) | 29.2 (9.3) | 31.2 (7.0) | 36.1 (8.5) | 34.8 (3.9) | 24.8 (4.7)* | 27.6 (5.7) | 9.1 (8.4) |
| Avg counts/bout | 453.8 (79.0) | 1079.8 (356.6) | 955.4 (340.0) | 1440.2 (295.3) | 989.5 (174.6) | 847.5 (150.0) | 705.8 (265.5) | 490.7 (307.0) |
| Avg peak rate | 42.4 (4.9) | 49.9 (7.8) | 46.9 (5.8) | 53.0 (8.0) | 44.3 (4.6) | 53.0 (2.9) | 40.6 (5.0) | 38.9 (2.7) |
| Bouts/h | 3.4 (0.6) | 7.0 (0.4)* | 3.9 (0.5) | 7.5 (1.5)* | 0.2 (0.2) | 1.0 (0.1) | 0.3 (0.2) | 0.1 (0.1) |
There were no differences in the total counts on the wheel between photoperiods, nor in counts per bout or in peak rate, but mice in CD did have shorter bout lengths in the light phase of the 18HR photoperiod and more bouts per hour in the dark phase of both 12HR and 18HR photoperiods (data indicate the mean (SEM) for n = 6; asterisks indicate significant differences from controls at p < 0.05).