Abstract P499: 24-month Follow-up Of The ‘Stand And Move At Work’ Sedentary Behavior Intervention: Effects On Workplace Sitting Time

Multicomponent interventions that use sit-stand workstations (SSW) to reduce workplace sitting time have been largely successful. However, the long-term maintenance (i.e., >12 months) of this behavior change is relatively unknown. We aimed to evaluate the 24-month maintenance of reductions in workplace sitting time, along with the effects of introducing the SSW after 12 months of multicomponent intervention only. We used data from Stand and Move at Work, a two-arm multi-site group randomized trial of 24 worksites (12 worksites per arm; N=630, 74% female, 45±11 years of age). Worksites in the STAND+ arm received 12 months of a multilevel (i.e., worksite policy, environmental, and individual-level strategies) intervention to increase light-intensity physical activity, along with a SSW, to increase standing time. Worksites in the MOVE+ arm (i.e., comparator) received the same multilevel intervention but were not provided with the SSW until after the intervention ended at 12 months. Sitting time was assessed for 7 consecutive days using the activPAL3c micro accelerometer at baseline, 12, and 24 months. Results are presented below in table form. In STAND+ , sitting time at 24 months, relative to baseline, was significantly reduced and similar in magnitude of change to what was observed at 12 months. In MOVE+ , sitting time at 24 months (a year after the SSW was introduced), relative to baseline, was significantly reduced but markedly smaller in magnitude of change than observed during the STAND+ active intervention period (i.e., 0 to 12 months). These results support the use of SSW coupled with a multicomponent intervention for optimal and long-term maintenance of reductions in workplace sitting time. Hierarchical regression models were adjusted for worksite clustering, age, sex, and baseline BMI.