title: Specific effects of a calorie-based intervention on stair climbing in overweight commuters.
abstract: BACKGROUND
  Point-of-choice prompts consistently increase stair climbing; a greater increase in overweight than normal weight individuals was reported in a multi-component worksite campaign.
  
  
  OBJECTIVE
  The purpose of this study is to investigate effects of a multi-component campaign, on stair climbing, in a public access setting.
  
  
  METHODS
  In an interrupted-time-series-design, baseline observations (2 weeks) preceded a 2-week point-of-choice prompt. An additional message, positioned at the top of the climb for a further 6-week period, summarised the calorific consequences of a single ascent. Inconspicuous observers recorded traveller's methods of ascent, coded by sex and weight status, twice a week between 08:00 and 09:59.
  
  
  RESULTS
  At baseline, the overweight chose stairs less than normal weight individuals. The multi-component campaign targeting weight control reversed this bias, increasing stair climbing only in overweight individuals.
  
  
  CONCLUSIONS
  The specificity of the effect confirms the appeal of this lifestyle activity for the overweight. The discussion focuses on how intentions to control weight may be converted into behaviour.
authors: Department of Primary Care Clinical Sciences, The University of Birmingham, Edgbaston, Birmingham, UK. a.lewis.1@bham.ac.uk
authors: Amanda L
authors: AL
authors: Lewis
authors: Frank F
authors: FF
authors: Eves