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Melatonin treatment of winter depression: a pilot study
A J Lewy1, V K Bauer, N L Cutler
1Department of Psychiatry, Oregon Health Sciences University, Portland 97201-3098, USA. lewy@ohsu.edu
Psychiatry Research
|March 10, 2000
Summary
Afternoon melatonin significantly reduced winter depression symptoms in a small study. Further research in larger groups is needed to confirm these promising findings for seasonal mood disorders.
Area of Science:
- Psychiatry
- Neuroscience
- Chronobiology
Background:
- Seasonal Affective Disorder (SAD), or winter depression, is a mood disorder characterized by depressive symptoms occurring during specific seasons, often winter.
- The phase shift hypothesis suggests that SAD is caused by a misalignment between the internal biological clock and the external environment, leading to delayed sleep and mood onset.
Purpose of the Study:
- To investigate the efficacy of low-dose afternoon melatonin administration in alleviating winter depression symptoms.
- To explore the potential of melatonin as a therapeutic agent for SAD and its relevance to the phase shift hypothesis.
Main Methods:
- A randomized, double-blind, placebo-controlled study involving ten patients diagnosed with winter depression.
- Participants received either low-dose melatonin in the afternoon or placebo capsules.
- Depression ratings were assessed to compare the effects of melatonin versus placebo.
Main Results:
- Melatonin treatment demonstrated a statistically significant reduction in depression ratings compared to the placebo group.
- The findings suggest a positive therapeutic effect of afternoon melatonin on winter depression symptoms.
Conclusions:
- Low-dose afternoon melatonin may be an effective treatment for winter depression.
- Replication in larger sample sizes, including documentation of phase shifts, is crucial to substantially support the phase shift hypothesis for SAD.