title: Prospective examination of objectively assessed physical activity and sedentary time after breast cancer treatment: sitting on the crest of the teachable moment.
abstract: BACKGROUND
  This study prospectively examined patterns of objectively assessed sedentary time and moderate-to-vigorous physical activity (MVPA) during a 1-year period following completion of primary treatment among breast cancer survivors. The potential moderating effect of weight status on sedentary and MVPA time was also examined.
  
  
  METHODS
  Breast cancer survivors [n = 177; M(SD)age = 54.9 (11.1) years, 85% White/Caucasian; 82% stage I or II cancer; M(SD)time since treatment = 3.5 (2.4) months] who were recruited into a convenience sample had weight, height, and waist circumference measured and wore Actigraph GT3X accelerometers for 1 week every 3 months for 1 year. Data were analyzed using repeated measures ANOVA.
  
  
  RESULTS
  Survivors spent nearly 78% of their day sedentary across all time points compared with less than 2% of their day engaged in MVPA. Sedentary time remained fairly stable over 12 months, whereas MVPA levels significantly decreased. Survivors with an overweight body mass index and unhealthy waist-to-height ratio engaged in significantly less MVPA than healthy weight survivors, with significant waist-to-height ratio moderator effects for both sedentary and MVPA.
  
  
  CONCLUSIONS
  Sedentary time remains high in the first year following treatment for breast cancer, and MVPA decreases. These trends are more pronounced for survivors who are overweight, with stronger effects noted when waist-to-height ratio was examined compared with body mass index.
  
  
  CONCLUSIONS
  These findings suggest that breast cancer survivors may be doing very little to improve their lifestyle behaviors following a cancer diagnosis and treatments.
authors.affiliation: Authors' Affiliations: Faculty of Kinesiology and Physical Education, University of Toronto, Toronto; catherine.sabiston@utoronto.ca.
authors.forename: Catherine M
authors.initials: CM
authors.lastname: Sabiston
authors.affiliation: School of Human Kinetics, University of Ottawa, Ottawa, Ontario;
authors.forename: Jennifer
authors.initials: J
authors.lastname: Brunet
authors.affiliation: Faculty of Health Disciplines, Athabasca University, Athabasca; and.
authors.forename: Jeff K
authors.initials: JK
authors.lastname: Vallance
authors.affiliation: McGill University Health Center, Cedar's Breast Clinic, Montreal, Quebec, Canada.
authors.forename: Sarkis
authors.initials: S
authors.lastname: Meterissian
mesh_terms: D000328:Adult; D000368:Aged; D015992:Body Mass Index; D001943:Breast Neoplasms; D005260:Female; D006801:Humans; D008875:Middle Aged; D009043:Motor Activity; D050177:Overweight; D011446:Prospective Studies; D017741:Survivors / Q000706:statistics & numerical data*; D065927:Waist-Height Ratio