부산대학교 도서관

An intervention to reducing prolonged workplace sitting may have potential for improving physiological stress and work performance, although the feasibility of collecting cortisol data may be limited in occupational settings. Studies that address issues with collecting saliva samples and that are powered to detect changes in physiological stress are recommended. Objective: The aim of the study is to explore the potential of a sitting reduction workplace intervention for improving stress and work performance. Methods: A cluster randomized controlled trial evaluated an intervention to reduce and break up occupational sitting in 12 clusters (n = 89 office workers) over 8 weeks. Outcomes were physiological stress (cortisol concentrations), perceived stress, and work performance. Results: Linear mixed model group × time interaction effects were nonsignificant. Exploratory analyses showed a trend, with a large effect, for lower cortisol concentrations over the day in the intervention group relative to controls at 8 weeks (−0.85; 95% confidence interval, −1.70 to 0.03 nmol·L−1; P = 0.06, d = 0.79). The intervention group had higher vigor and cognitive liveliness at 8 weeks relative to controls (P ≤ 0.05). Conclusions: This exploratory study suggests that there could be meaningful changes in physiological stress and work-related outcomes that should be investigated in future studies. [ABSTRACT FROM AUTHOR]