title: Validity of occupational energy expenditure assessed by interview.
abstract: 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. Twenty-seven persons were included in the study. Each respondent defined all tasks performed during a typical workday and estimated their durations. For each task the interviewer then assessed the level of energy expenditure in multiples of the resting metabolic rate (MET) and calculated a time-weighted average MET (TWA-MET) for a typical workday. Measurements of oxygen consumption and observations of duration of each work task were performed during 2 workdays in all the interviewed subjects. The validity was tested by comparing TWA-MET derived from the interviews with those derived from measurements; the product moment correlation coefficient was 0.70. The interview may offer sufficient validity for assessment of energy expenditure in large population studies.
authors.affiliation: Department of Occupational Health, Karolinska Hospital, Stockholm, Sweden. gunilla.pernold@smd.sll.se
authors.forename: Gunilla
authors.initials: G
authors.lastname: Pernold
authors.forename: Ewa Wigaeus
authors.initials: EW
authors.lastname: Tornqvist
authors.forename: Christina
authors.initials: C
authors.lastname: Wiktorin
authors.forename: Monica
authors.initials: M
authors.lastname: Mortimer
authors.forename: Eva
authors.initials: E
authors.lastname: Karlsson
authors.forename: Asa
authors.initials: A
authors.lastname: Kilbom
authors.forename: Eva
authors.initials: E
authors.lastname: Vingård
mesh_terms: D000328:Adult; D004734:Energy Metabolism; D005260:Female; D006801:Humans; D007407:Interviews as Topic / Q000592:standards*; D008297:Male; D008875:Middle Aged; D009787:Occupational Medicine / Q000379:methods*; D010101:Oxygen Consumption / Q000502:physiology; D015203:Reproducibility of Results; D013647:Task Performance and Analysis; D014937:Work / Q000502:physiology*