Table 2.

Circadian parameters for R_w and T_b (mean ± SEM). Group 1 = synchronized animals in which serum melatonin showed a high (more than 5) night-to-day ratio. Group 2 = synchronized animals in which serum melatonin showed a night-to-day ratio smaller than 2. Group 3 = desynchronized animals (i.e., animals in which the serum melatonin levels peaked during the subjective day). No significant differences were observed among the groups in any of the circadian parameters investigated (ANOVA, P > 0.1).

		Running wheel activity			Body Temperature
	N	Mesor	Amplitude	τ	Mesor	Amplitude	τ
Group 1	8	0.9 ± 0.2	17.2 ± 3.4	24.9 ± 0.1	37.5 ± 0.1	1.9 ± 0.1	24.9 ± 0.1
Group 2	6	2.7 ± 0.9	31.5 ± 5.4	25.0 ± 0.1	37.3 ± 0.1	2.2 ± 0.2	25.0 ± 0.1
Group 3	7	1.4 ± 0.8	20.2 ± 5.9	24.8 ± 0.2	37.2 ± 0.1	1.9 ± 0.1	24.7 ± 0.2