title: Increased physical activity reduces prevalence of periodontitis.
abstract: OBJECTIVE
  Physical activity has been shown to have a protective relationship with several chronic diseases. Recently, physical activity was also found to reduce the risk of periodontitis in a study in male health professionals. However, the relationship between physical activity and periodontitis in a diverse group of individuals is not thoroughly examined. The purpose of this study was to examine if there is an association between sustained physical activity and periodontitis in a subset of the third national health and nutrition examination survey (NHANES III).
  
  
  METHODS
  NHANES III participants 18 years of age or older who had had a periodontal examination and reported to have a similar physical activity (or inactivity) level for 10 years or longer were selected (n=2521). Multivariable logistic regression analysis was used to estimate the association between physical activity and periodontitis. The analysis was adjusted for: age, gender, race, education, smoking, body mass index, poverty index, vitamin use, healthy eating index, time since last dental visit, gingival bleeding, and dental calculus.
  
  
  RESULTS
  Engaging in the recommended level of physical activity was significantly associated with lower periodontitis prevalence (OR=0.58, 95% CI, 0.35-0.96). Smoking, however, was found to modify this relationship. The association was strong and significant among never (OR=0.46, 95% CI, 0.23-0.93) and former smokers (OR=0.26, 95% CI: 0.09-0.72), but not among current smokers (OR=1.10, 95% CI: 0.48-2.53).
  
  
  CONCLUSIONS
  These results suggest that engaging in the recommended level of exercise is associated with lower periodontitis prevalence, especially among never and former smokers.
authors.affiliation: Division of Periodontics, Faculty of Dentistry, King Abdulaziz University, P.O. Box 100434, Jeddah 21311, Saudi Arabia. mxa67@cwru.edu
authors.forename: Mohammad S
authors.initials: MS
authors.lastname: Al-Zahrani
authors.forename: Elaine A
authors.initials: EA
authors.lastname: Borawski
authors.forename: Nabil F
authors.initials: NF
authors.lastname: Bissada
mesh_terms: D000328:Adult; D015444:Exercise; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D010518:Periodontitis / Q000453:epidemiology / Q000517:prevention & control*; D015995:Prevalence; D012907:Smoking / Q000009:adverse effects