This study will explore the effectiveness of a Health Action Process Approach (HAPA) mobile health (mHealth) intervention on reducing sedentary behaviour and perceived stress in desk-based office workers. Half of participants will receive a mHealth HAPA intervention consisting of a theory-driven behavioural counselling session and weekly HAPA based worksheets delivered through a mobile application. The other half of participants will act as a control group and will receive no intervention or information past the letter of information. The study will take place over eight weeks, with the first four weeks acting as the intervention period and a follow-up at the end of week eight.
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Changes in Time Spent Sitting at Work
Timeframe: Baseline, Weeks 1, 2, 3, 4, 8
Changes in Time Spent Standing at Work
Timeframe: Baseline, Weeks 1, 2, 3, 4, 8
Changes in Time Spent Engaged in Light-Intensity Physical Activity at Work
Timeframe: Baseline, Weeks 1, 2, 3, 4, 8
Changes in Frequency of Breaks from Sitting at Work
Timeframe: Baseline, Weeks 1, 2, 3, 4, 8
Changes in Duration of Breaks from Sitting at Work
Timeframe: Baseline, Weeks 1, 2, 3, 4, 8