Tailored Domain-Specific Sedentary Behavior Intervention on Reducing Sedentary Time

Abstract

PURPOSE: To continue the advancement of sedentary behavior intervention, it is important for researchers to design the intervention based on the theoretical model and contextual information of sedentary behavior. Therefore, the purpose of this study is to identify the feasibility of tailored domain-specific sedentary behavior intervention on reducing sedentary behavior time using contextual information of sedentary behavior. METHODS: A total of 43 adults (age ≥ 18) were participated in this study. A randomized controlled trial with a covariate adaptive randomization was used. Participants were randomly assigned to three groups: 1) tailored domain-specific intervention group; 2) standard intervention group; and 3) control group. Behavioral strategies to reduce sedentary behavior included educational meeting and materials, goal setting and feedback, and self-monitoring based on theoretical background for two intervention groups. Additionally, contextual information of sedentary behavior was given to tailored intervention group. Participants’ sedentary behavior time was measured at baseline, 1st and 2nd intervention week by accelerometers, and contextual information of their sedentary behavior was obtained from the Sedentary Behavior Record instrument. Two-way (Group × Time) repeated measures analysis of variance was conducted for comparison for changes in total time spent in sedentary behavior among the three groups. RESULTS: Thirty-six out of 43 participants who wore the Actigraph during at least 10 hours per day for at least four days were included in this study. There was a significant interaction between group and time, F(3.9, 63.6) = 3.94, G-G p = .007, η2p = .193. Simple effect analysis results showed that sedentary behavior time at each time point were not significantly different for the control group, F(1.7, 18.9) = 0.48, G-G p = .597, η2p = .042, and the standard intervention group, F(1.8, 20.1) = 1.76, G-G p = .198, η2p = .138. The sedentary behavior time, however, differed among three times for tailored domain-specific intervention group, F(1.7, 18.8) = 14.00, G-G p < .001, η2p = .560. CONCLUSIONS: The tailored domain-specific sedentary behavior intervention using contextual information of sedentary behavior was effective, reducing sedentary behavior time for adults.