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Study aim
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To investigate the efficacy of Internet-delivered computer-tailored multimedia advice through smartphone on the promotion of a physical activity and quality of life among healthy individuals.
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Design
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A 12-weeks randomized clinical trial with a control group, single-blinded, with a parallel group design of 148 cases, enrolled between May and December 2017 and outcome assessment.
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Settings and conduct
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Participants were selected from healthcare workers and patients' company who volunteered to participate in the study. Participants were randomly assigned to case and control groups using a software and participants, data collectors and outcome assessors were blind to it.
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Participants/Inclusion and exclusion criteria
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Inclusion criteria: 18-65 years old physically and mentally healthy individuals with access to Internet and smartphone and basic knowledge of using them.
Exclusion criteria: High cardiovascular risk, Uncontrolled hypertension, Valvular heart disease (except MVP), CHF, Peripheral arterial disease, MI or CVA in past 6 months, History of Cancer, Significant unexplained weight loss, Advanced pulmonary disease, Pregnancy, Diseases or conditions preventing patient from increasing his/her physical activity (LBP, Osteoarthritis).
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Intervention groups
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Participants (intervention and control) are assigned based on their baseline physical activity and cardiovascular risk to mild, moderated and heavy exercise protocols. Both intervention and control groups receive the same exercises and information in multimedia format via website and Telegram® messenger application on their smartphones with the difference that participants in the intervention group receive their program weekly and are required to fill a workbook online at the end of every week and receive appropriate feedbacks and changes in their exercise program for the next week based on their performance on the past week’s assignments. They also receive weekly reminder e-mails, text messages, and instant messages to remind them of their assignments and to submit their workbook at the end of the week (tailored intervention). The control group has access to all the 12-week program consisting of the same exercises and information in multimedia format from the beginning of the study. They neither have to provide a weekly workbook nor receive any feedbacks or reminders.
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Main outcome variables
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Body Mass Index (kg/m^2)
Physical activity (METs.min/week)
Minutes of Vigorous to Moderate Physical Activity (min)
Quality of life domains (SF-36 Questionnaire)