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A combined health action process approach and mHealth intervention to reduce sedentary behaviour in university students -- a randomized controlled trial
Dillon K, Rollo S, Prapavessis H
Psychology & Health 2022;37(6):692-711
clinical trial
6/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: Yes; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

OBJECTIVE: This investigation evaluated the effectiveness of a Health Action Process Approach (HAPA) based planning intervention augmented with text messages to reduce student-related sitting time (primary outcome) and increase specific non-sedentary behaviours. Relationships between the HAPA volitional constructs and sedentary and non-sedentary behaviours were also explored. DESIGN: University students (Mage = 21.13 y; SD 4.81) were randomized into either a HAPA intervention (n = 28) or control (n = 33) condition. MAIN OUTCOME MEASURES: School-related sitting time, time spent in specific non-sedentary behaviours and HAPA volitional constructs were assessed at baseline, weeks 2, 4, 6 (post-intervention) and 8 (follow-up). RESULTS: Significant group by time interaction effects favouring the intervention group were found for sitting time (p = 0.004, etap2 = 0.10), walking time (p = 0.021, etap2 = 0.06) and stretching time (p = 0.023, etap2 = 0.08), as well as for action planning (p < 0.001, etap2 = 0.17), coping planning (p < 0.001, etap2 = 0.20) and action control (p < 0.001, etap2 = 0.20). Significant correlations (p < 0.05) were also found between the HAPA constructs and sitting-related outcomes. CONCLUSIONS: Combining a HAPA-based planning intervention with text messages can reduce student-related sitting time in university students. Supplemental data for this article is available online at https://doi.org/10.1080/08870446.2021.1900574.

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