title: Effect of physical activity after recent deep venous thrombosis: a cohort study.
abstract: OBJECTIVE
  To determine whether increased physical activity 1 month after deep vein thrombosis (DVT) led to worsening of venous symptoms and signs within the subsequent 3 months.
  
  
  METHODS
  By a multicenter prospective cohort study of patients with acute DVT, we used validated questionnaires at baseline, 1 month, and 4 months post-DVT for each exposure, using the Godin Questionnaire to measure physical activity, the VEINES-QOL to measure disease severity, and the postthrombotic syndrome (PTS) scale to measure symptoms and signs usually attributed to sequelae of DVT.
  
  
  RESULTS
  Of 301 patients followed for 4 months, 25% were inactive and 25% were only mildly active before their DVT. In univariate analysis, physical activity at 1 month was not associated with a change in PTS score between 1 month and 4 months (P=0.42). After adjusting for the potential confounders of age, sex, pre-DVT physical activity, and disease severity at 1 month, the results suggested that higher physical activity levels at 1 month may be protective against worsening of the PTS score over the subsequent 3 months. Compared with those who were inactive at 1 month, the adjusted OR was 0.93 (95%CI: 0.47, 1.87) for mildly to moderately active persons, and 0.52 (95%CI: 0.24, 1.15) for highly active persons. Among patients who were active pre-DVT (N=220), 55.5% had returned to their previous levels of physical activity or greater within 4 months.
  
  
  CONCLUSIONS
  For most persons, exercise at 1 month post-DVT does not appear to worsen venous symptoms and signs over the subsequent 3 months, and more than 50% resume their usual level of activity within 4 months.
authors.affiliation: Centre for Clinical Epidemiology and Community Studies, Lady Davis Institute for Medical Research, SMBD-Jewish General Hospital, Montréal, CANADA. ian.shrier@mcgill.ca
authors.forename: Ian
authors.initials: I
authors.lastname: Shrier
authors.forename: Susan R
authors.initials: SR
authors.lastname: Kahn
mesh_terms: D004812:Epidemiologic Methods; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011186:Postphlebitic Syndrome / Q000503:physiopathology*; D020246:Venous Thrombosis / Q000503:physiopathology*