A Combined Health Action Process Approach and mHealth Intervention to Increase Non-Sedentary Behaviours in Office-Working Adults-A Randomised Controlled Trial.

Abstract

Office-working adults represent an at-risk population for high levels of sedentary behaviour (SB), which has been associated with an increased risk for numerous chronic diseases. This study examined the effectiveness of a Health Action Process Approach (HAPA) based planning intervention augmented with tailored text messages to reduce workplace sitting time (primary outcome) and increase specific non-SBs (i.e. standing time, walking time, stretching time, break frequency, break duration). A secondary purpose was to examine relationships among HAPA volitional constructs and sedentary and non-SBs. Full-time office workers (Mage =45.18±11.33years) from Canada were randomised into either a HAPA intervention (n=29) or control (n=31) condition. Workplace sitting time, time spent in specific non-SBs, and HAPA volitional constructs were assessed at baseline, weeks 2, 4, 6 (post-intervention), and 8 (follow-up). Significant group by time interaction effects, that favoured the intervention group, were found for sitting time (p=.003, ɳp2 =.07), standing time (p=.019, ɳp2 =.05), and stretching time (p=.001, ɳp2 =.08) as well as for action planning (p<.001, ɳp2 =.20), coping planning (p<.001, ɳp2 =.18), and action control (p<.001, ɳp2 =.15). Significant correlations (p<.05) were also found between the HAPA constructs and time spent sitting, standing, walking, as well as break frequency. Augmenting a HAPA-based planning intervention with text messages can reduce workplace sitting time in office workers. ClinicalTrials.gov identifier: NCT03461926.