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Point-of-choice prompts to reduce sitting time at work: a randomized trial
Evans RE, Fawole HO, Sheriff SA, Dall PM, Grant PM, Ryan CG
American Journal of Preventive Medicine 2012 Sep;43(3):293-297
clinical trial
7/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

BACKGROUND: Prolonged sitting is prevalent in the workplace and is associated with adverse health markers. PURPOSE: Investigate the effects of point-of-choice (PoC) prompting software, on the computer used at work (PC), to reduce long uninterrupted sedentary periods and total sedentary time at work. DESIGN: Assessor-blinded, parallel group, active-controlled randomized trial. SETTING/PARTICIPANTS: A convenience sample of office workers from Glasgow, United Kingdom. Data were collected April to June 2010, and analyzed October 2010 to June 2011. INTERVENTION: The education group (n = 14) received a brief education session on the importance of reducing long sitting periods at work. The PoC group (n = 14) received the same education along with prompting software on their PC for 5 workdays, which reminded them to stand up every 30 minutes. MAIN OUTCOME MEASURES: Sitting time was measured objectively using the activPAL activity monitor for 5 workdays at baseline and 5 workdays during the intervention. The number and time spent sitting in events > 30 minutes' duration were the main outcome measures. RESULTS: At baseline, participants spent 5.7 +/- 1.0 hours/day (76% +/- 9%) of their time at work sitting. Of that time, 3.3 +/- 1.3 hours/day was spent sitting in 3.7 +/- 1.4 events > 30 minutes. There was a significant difference between the groups in the change (intervention to baseline) of both the number (ANCOVA; -6.8%, p = 0.014) and duration (-15.5%, p = 0.007) of sitting events > 30 minutes. During the intervention, compared with baseline, the PoC group reduced the number (paired t-test; -0.11 events/hour, p = 0.045) and duration (-12.2%, p = 0.035) of sitting events > 30 minutes. However, there was no significant difference in total sitting time between groups (-4.4%, p = 0.084). CONCLUSIONS: Point-of-choice prompting software on work computers recommending taking a break from sitting plus education is superior to education alone in reducing long uninterrupted sedentary periods at work. TRIAL REGISTRATION: This trial was registered at ClinicalTrials.gov NCT01628861.

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