Context Depression is approximately twice as prevalent among women compared with men and is associated with functional disability, co-morbid medical conditions and social deprivation.Longer life expectancy is leading to a growing ageing population for whom depression is a major public mental health problem. Greater physical activity can prevent the onset of depression and reduce symptoms of depression in older adults and children and adolescents. Regular physical activity may be an adjunct treatment for depression.5 However, reverse causality is often a possible explanation for previous findings, and even in prospective designed studies, the interactive confounding effects of age, gender, physical activity and depression have not been fully investigated.
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