title: Physical activity patterns among walkers and compliance with public health recommendations.
abstract: OBJECTIVE
  Walking is the most common leisure-time physical activity (LTPA) among U.S. adults. The purpose of this study was to estimate the prevalence of walking for physical activity and the proportion of walkers who met current public health physical activity recommendations.
  
  
  METHODS
  We analyzed data from the 1998 Behavioral Risk Factor Surveillance System, a collection of state-based, random-digit-dialed telephone surveys of adults. Physical activity measures included the type, frequency, and duration of the two LTPAs in which respondents engaged most often during the previous month. We calculated the prevalence of walking and the prevalence of three physical activity patterns defined by combinations of walking duration and frequency. We also examined the effect on these patterns of participating in a second LTPA.
  
  
  RESULTS
  In 1998, an estimated 38.6% of U.S. adults walked for physical activity. Among walkers, 21.3% walked a minimum of 30 min five or more times per week. This approximates compliance with current physical activity recommendations. Compliance increased to 34.5% when the criteria were relaxed to include at least 150 min of walking per week accumulated over three or more occasions. Relaxing the criteria further to include a minimum of 150 min.wk(-1) regardless of frequency produced only a small increase in compliance (37.6%). However, compliance with each of these three activity patterns approximately doubled when a second LTPA was taken into account.
  
  
  CONCLUSIONS
  Less than 40% of walkers complied through walking with even our most liberal physical activity pattern (> or =150 min.wk(-1) regardless of frequency). For walkers to meet current public health recommendations, many need to walk more frequently and/or to engage in additional physical activities.
authors.affiliation: Division of Epidemiology Services, Bureau of Epidemiology, Michigan Department of Community Health, 3423 N. Martin Luther King Boulevard, PO Box 3095, Lansing, MI 48909, USA. raffertya@michigan.gov
authors.forename: Ann P
authors.initials: AP
authors.lastname: Rafferty
authors.forename: Mathew J
authors.initials: MJ
authors.lastname: Reeves
authors.forename: Harry B
authors.initials: HB
authors.lastname: McGee
authors.forename: James M
authors.initials: JM
authors.lastname: Pivarnik
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D015331:Cohort Studies; D016001:Confidence Intervals; D005260:Female; D019983:Guideline Adherence; D006293:Health Promotion; D006304:Health Status; D006801:Humans; D007899:Leisure Activities; D008019:Life Style; D008297:Male; D008875:Middle Aged; D010809:Physical Fitness / Q000502:physiology*; D015995:Prevalence; D011634:Public Health / Q000592:standards*; D012680:Sensitivity and Specificity; D012737:Sex Factors; D014481:United States; D016138:Walking / Q000502:physiology* / Q000706:statistics & numerical data*