Elsevier

Psychiatry Research

Volume 52, Issue 1, April 1994, Pages 85-98
Psychiatry Research

Circadian pattern of motor activity in major depressed patients undergoing antidepressant therapy: Relationship between actigraphic measures and clinical course

https://doi.org/10.1016/0165-1781(94)90122-8Get rights and content

Abstract

The 24-hour motor activity pattern was evaluated in 26 inpatients with major depression at treatment onset and after 4 weeks of antidepressant therapy. Clinical state, depression, and psychomotor retardation, as well as motor activity level and circadian rhythm, were simultaneously assessed. Treatment responders and nonresponders were also considered. Diurnal hypoactivity and reduced 24-hour rhythm amplitude were found at treatment onset. Activity level increased significantly on discharge. The rest-activity cycle for each depressed patient fit a cosine function o 24-hour periodicity. Data tended to show no phase shift but a large intragroup phase variability. Preliminary findings of a negative correlation between basic activity level andclinical improvement, and a trend toward responders having a lower activity level than nonresponders, suggest that activity could be used to predict therapeutic response.

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