title: Physical activity, social network type, and depressive symptoms in late life: an analysis of data from the National Social Life, Health and Aging Project.
abstract: OBJECTIVE
  To clarify whether physical activity among older Americans is associated with depressive symptoms, beyond the effects of social network type, physical health, and sociodemographic characteristics.
  
  
  METHODS
  The analysis used data from a sub-sample, aged 65–85, from the National Social Life, Health and Aging Project (N=1349). Hierarchical regressions examined the respective effects of selected network types and extent of engagement in physical activity on depressive symptoms, controlling for physical health and sociodemographic background.
  
  
  RESULTS
  The findings showed that physical activity was correlated inversely with late life depressive symptoms. However, when interaction terms for the selected social network types and the extent of physical activity were also considered, the main effect of social network on depressive symptoms increased, while that of physical activity was eliminated.
  
  
  CONCLUSIONS
  The results show that older American adults embedded in family network types are at risk of limited physical activity. However, interventions aimed to increase their engagement in physical activity might help to reduce depressive symptoms within this group.
authors.affiliation: Israel Gerontological Data Center, Paul Baerwald School of Social Work and Social Welfare, The Hebrew University in Jerusalem, Mount Scopus, Jerusalem 91905-IL, Israel. mshowie@huji.ac.il
authors.forename: Howard
authors.initials: H
authors.lastname: Litwin
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000523:psychology; D003625:Data Collection; D003863:Depression / Q000145:classification / Q000453:epidemiology*; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D011788:Quality of Life; D012044:Regression Analysis; D012720:Severity of Illness Index; D012944:Social Support; D014481:United States / Q000453:epidemiology