Validity of occupational energy expenditure assessed by interview.

Measuring physical activity at work has been a field of growing interest in recent decades, and there is a need for reliable, standardized assessment instruments for application in large population studies. The present study examined the validity of a task-oriented interview for assessing energy expenditure in occupational work. The interview was developed for use in the MUSIC-Norrtälje study, a population study with the overall aim of identifying risk and preventive factors for musculoskeletal disorders.