Abstract
Objectives
This study was designed to test the hypothesis that delayed recovery from disrupted circadian rhythm is associated with both manic and depressive episodes in bipolar disorder.
Methods
Twenty-two male mice (age of five weeks, weight 28–30 gm) underwent three days of light-dark cycle disruption and 10 days of recovery phase. Sleep and wake state were checked every five minutes during the entire experimental period. After recovery phase, quinpirole (0.5 mg/kg, s.c.) was injected into the mice and open field locomotor activities were checked. Five days after the open field test, immobility time during the last 4 min in 6 min of forced swimming test was measured. Animals which recovered sleep-wake cycle within six days after light-dark cycle disruption were assigned to the early recovery group (n=14), and those that failed to recover in six days were assigned to the delayed recovery group (n=8). The locomotor activities and the immobility times of the two groups were compared by Mann-Whiney U test at two-tailed significance level of 0.05.
Acknowledgments
This study was supported by clinical research grant from Pusan National University Hospital (2013). The funding source had no further role in the study design, in the collection, analysis and interpretation of the data, in the writing of the report or in the decision to submit the paper for publication.
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