Abstract
Background: In light of evidence linking sedentary behaviors to health outcomes, there have been calls for the measurement of sedentary behavior in surveillance studies. This study examined the convergent validity of 2 self-report measures of sitting time and accelerometer-determined sedentary time (minutes/day of <100 counts/minute).
Methods: 44 adults wore an ActiGraph accelerometer for 7 days, during which they also recorded daily sitting time in a diary, in response to a single-item question. After 7 days, participants completed a new domain-specifc questionnaire to assess usual weekday and weekend-day sitting time. Total sitting times recorded from the self-report measures were compared with accelerometer-determined sedentary time.
Results: Total sitting time calculated from the domain-specific questionnaire did not differ significantly from accelerometer-determined sedentary time on weekdays (mean difference [±SE] = -14 ± 28 mins/day) and weekend days (-4 ± 45 mins/day, both P > .05). Sitting time was significantly underestimated using the single-item specific-day question on weekdays (-173 ± 18 mins/day) and weekend days (-219 ± 23 mins/day, both P < .001).
Conclusions: When assessed via self-report, the estimation of total sitting time is improved by summing sitting times reported across different domains. The continued improvement of self-report measures of sitting time will be important if we are to further our understanding of the links between sedentary behavior and health.
| Original language | English |
|---|---|
| Pages (from-to) | 533-539 |
| Number of pages | 7 |
| Journal | Journal of Physical Activity and Health |
| Volume | 9 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2012 |
| Externally published | Yes |