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The objectives of this study were to investigate the effectiveness of Facebook group message to reduce screen-based sedentary behavior; and increase light physical activity, attitude, perceived self-efficacy toward break time and perceived self-efficacy to increase light physical activity. A randomized control trial was employed in this study. Office workers were randomly assigned to either a control group or a treatment group. General healthy tips messages were sent to the control group everyday, whereas four types of messages including threat, effectiveness, social persuasion and mastery experience were sent to the treatment group three times a day. A statistical method was performed using Analysis of Covariance (ANCOVA). The finding showed that screen-based sedentary behavior significantly decreased among the treatment group (p < 0.01). Moreover, attitude, perceived self-efficacy toward a break time, and perceived self-efficacy to increase light physical activities increased among the treatment group (p < 0.05). However, there was no significant difference between the treatment and the control groups on the light physical activity (p > 0.05).
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