title: Correlation between pedometer and the Global Physical Activity Questionnaire on physical activity measurement in office workers.
abstract: BACKGROUND
  This study aimed to examine the correlation of physical activity levels assessed by pedometer and those by the Global Physical Activity Questionnaire (GPAQ) in a population of office workers.
  
  
  METHODS
  A cross-sectional study was conducted on 320 office workers. A self-administered questionnaire was distributed to each office worker by hand. Physical activity level was objectively assessed by a pedometer for 7 consecutive days and subjectively assessed by the GPAQ. Based on the pedometer and GPAQ outcomes, participants were classified into 3 groups: inactive, moderately active, and highly active.
  
  
  RESULTS
  No correlation in the physical activity level assessed by the pedometer and GPAQ was found (rs = .08, P = 0.15). When considering the pedometer as the criterion for comparison, 65.3% of participants had underestimated their physical activity level using the GPAQ, whereas 9.3% of participants overestimated their physical activity level.
  
  
  CONCLUSIONS
  Physical activity level in office workers assessed by a subjective measure was greatly different from assessed by an objective tool. Consequently, research on physical activity level, especially in those with sedentary lifestyle, should consider using an objective measure to ensure that it closely reflects a person's physical activity level.
authors.forename: Ekalak
authors.initials: E
authors.lastname: Sitthipornvorakul
authors.affiliation: Department of Physical Therapy, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, Thailand. prawit.j@chula.ac.th.
authors.forename: Prawit
authors.initials: P
authors.lastname: Janwantanakul
authors.forename: Allard J
authors.initials: AJ
authors.lastname: van der Beek
mesh_terms: D056044:Actigraphy / Q000295:instrumentation*; D000328:Adult; D003710:Demography; D004651:Employment; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity; D011795:Surveys and Questionnaires; D013785:Thailand; D000078329:Workforce