Figure 1
Flow of the study design. 0) 3-week run-in: To be randomized, participants must successfully complete a 3-week run-in period (defined as at least 80% adherence rate in using daily message and diary and at least eight hours a day for ≥ 80% of the run-in period and completed a fasting blood test in a research lab). 1) CONTROL: Pedometer only for 9-months, no physical activity intervention,
2) REGULAR: 3-month mobile phone and pedometer based physical activity intervention and 6-month pedometer maintenance intervention, and 3) PLUS: 3-month mobile phone and pedometer based physical activity intervention and 6-month mobile phone diary maintenance intervention.