Objectives: Comparing the effect of different sit-stand schedule on physiological and mental parameters, and productivity in office personnel.
Design: Studied population is university office workers that 45 subjects (male and female) from them as sample will be chosen based on simple random method. The blinding will not be done and study will be conducted as a single-center.
Setting and conduct: Before intervention, outcomes of the study in the sample will be measured. Samples are divided into 3 groups by block randomization (2 intervention groups and 1 control group) and interventions will last for 2 months. After this period (2 months), outcomes will be measured again.
Participants: People who have work experience more than one year, included in the study and people with musculoskeletal, psychological and hormonal disorders symptoms, will be excluded.
Intervention: In this study, intervention is height-adjustable desk and schedule time. Schedule time includes 3 groups: time regime 1 (30 minute in sitting and 30 minutes in standing position), time regime 2 (45 minute in sitting and 15 minutes in standing position) and control group (usual sitting position).
Main outcome measures: Variables including working energy expenditure, blood parameters (HDL, LDL, glucose, cortisol, insulin, inflammatory factors (TNFα, hs-CRP and IL6) and serotonin), pulse rate, level of depression, prevalence of musculoskeletal disorders symptoms, level of fatigue, level of productivity and level of discomfort before and after intervention will be assessed.