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The Efficacy of Exercise as a Long-term Antidepressant in Elderly Subjects

A Randomized, Controlled Trial

^a Division on Aging, Harvard Medical School, Boston, Massachusetts
^b Brockton West Roxbury VA Medical Center, Brockton, Massachusetts
^c Jean Mayer United States Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts
^d The Hebrew Rehabilitation Center for Aged, Roslindale, Massachusetts
^e The School of Exercise and Sport Science, University of Sydney, Australia

Nalin A. Singh, Department of Geriatrics, Balmain Hospital, Booth Street, Balmain 2041, NSW, Australia E-mail: singhn{at}email.cs.nsw.gov.au.

Decision Editor: John E. Morley, MB, BCh

Background. Pharmacological treatment of depression in geriatric patients is often difficult. Although unsupervised exercise has been shown to benefit younger depressed patients, there is no evidence that unsupervised exercise can be used as a maintenance treatment for depression in elderly patients. Our aim was to test the feasibility and efficacy of unsupervised exercise as a long-term treatment for clinical depression in elderly patients.

Methods. We studied 32 subjects (71.3 ± 1.2 years of age, mean ± SE) in a 20-week, randomized, controlled trial, with follow-up at 26 months. Subjects were community-dwelling patients with major or minor depression or dysthymia. Exercisers engaged in 10 weeks of supervised weight-lifting exercise followed by 10 weeks of unsupervised exercise. Controls attended lectures for 10 weeks. No contact was made with either group after 20 weeks until final follow-up. Blinded assessment was made with the Beck Depression Inventory (BDI), the Philadelphia Geriatric Morale Scale, and Ewart's Self Efficacy Scale at 20 weeks and with the BDI and physical activity questionnaire at 26 months.

Results. Patients randomized to the exercise condition completed 18 ± 2 sessions of unsupervised exercise during Weeks 10 to 20. The BDI was significantly reduced at both 20 weeks and 26 months of follow-up in exercisers compared with controls (p < .05–.001). At the 26-month follow-up, 33% of the exercisers were still regularly weight lifting, versus 0% of controls (p < .05).

Conclusions. Unsupervised weight-lifting exercise maintains its antidepressant effectiveness at 20 weeks in depressed elderly patients. Long-term changes in exercise behavior are possible in some patients even without supervision.

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