title: Exercise behavior in cancer survivors and associated factors.
abstract: BACKGROUND
  Physical activity is an important component in promoting a healthy life style in cancer survivors. We estimated the proportion of cancer survivors who are physically active, defined as meeting public health exercise guidelines, and changes in level of physical activity (LPA) from before diagnosis to after treatment. We also identified medical and demographic factors associated with LPA and its changes.
  
  
  METHODS
  A cross-sectional survey assessing LPA before diagnosis and after treatment, together with demographic and medical variables in 975 cancer survivors.
  
  
  RESULTS
  Forty-five percent of the cancer survivors were physically active after treatment. Before diagnosis and after treatment 33% were active, whereas 40% were inactive at both time points. Fifteen percent were active before diagnosis but inactive after treatment, and 12% were inactive before diagnosis but active after treatment. Increasing age and weight, low education, comorbidity and smoking were associated with physical inactivity after treatment. Change in LPA from active to inactive was associated with comorbidity, distant disease and smoking, while a change from inactive to active was associated with high education.
  
  
  CONCLUSIONS
  Less than half of cancer survivors were physically active. Almost three quarters of cancer survivors remained stable in LPA. The remaining quarter changed LPA, with slightly more cancer survivors becoming inactive than active. Age, weight, education, comorbidity, disease stage and smoking can identify survivors at risk of physical inactivity after treatment.
  
  
  CONCLUSIONS
  Recognizable variables can be used to identify physically inactive cancer survivors after treatment and give these survivors support to start or maintain LPA.
authors.affiliation: National Resource Center for Late Effects, Department of Oncology, Oslo University Hospital and University of Oslo (The Norwegian Radium Hospital), Montebello, 0310 Oslo, Norway. gunhild.maria.gjerset@oslo-universitetssykehus.no
authors.forename: Gunhild Maria
authors.initials: GM
authors.lastname: Gjerset
authors.forename: Sophie Dorothea
authors.initials: SD
authors.lastname: Fosså
authors.forename: Kerry S
authors.initials: KS
authors.lastname: Courneya
authors.forename: Eva
authors.initials: E
authors.lastname: Skovlund
authors.forename: Lene
authors.initials: L
authors.lastname: Thorsen
mesh_terms: D000465:Algorithms; D003710:Demography / Q000706:statistics & numerical data; D015444:Exercise / Q000502:physiology* / Q000523:psychology; D005260:Female; D015438:Health Behavior; D006801:Humans; D008019:Life Style; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology; D009369:Neoplasms / Q000453:epidemiology / Q000473:pathology / Q000534:rehabilitation* / Q000628:therapy; D010349:Patient Compliance; D015995:Prevalence; D011788:Quality of Life; D012008:Recurrence; D017741:Survivors / Q000523:psychology / Q000706:statistics & numerical data