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Purpose: This study explored definitions of sedentary behavior and examined the relationship between sitting time and physical inactivity using the sitting items from the International Physical Activity Questionnaire (IPAQ). Methods: Participants (N = 289, 44.6% male, mean age = 35.93) from 3 countries completed self-administered long-and short-IPAQ sitting items. Participants wore accelerometers; were classified as inactive (no leisure-time activity), insufficiently active, or meetingdoi:10.1123/jpah.5.s1.s30 pmid:18364524 fatcat:lys5ol6ftva6veyls2xs4npafi