After baseline assessment, 32 participants were randomly divided into two groups. A crossover trial (16 vs. 16) was performed for thirteen weeks including baseline measurements. The participants assigned to Group A completed their office work in a standing position (standing work, SW) for 10 hours per week or more (SW period) during the first experimental period from weeks 2 to 7, and simultaneously the participants of Group B were asked to maintain their normal sitting working habits during the control period (CONT period) after the baseline measurements. At the end of the first period the activity of the group was changed for either CONT (Group A) or SW (Group B) for the second period from weeks 8 to 13. Anthropometric measurements were taken on the 1st week, 7th week, and 13th week, and the comparison of before and after the SW period were analysed. PA assessments were performed throughout 13 weeks, and data extraction from accelerometers was performed at the same time as anthropometric. Statistical comparisons for PA measures were performed between the SW period and CONT period to verify the effects of installation of standing desks.