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By using the Health Action Process Approach (HAPA) model as a theoretical backdrop, the proposed study aims to provide an 8-week e-health learning strategies for Chinese cardiac patients, with which they can follow at home after rehabilitation discharge. The current study will examine whether the cardiac rehabilitation patients in intervention group would increase their physical activity (PA) level and fruit-vegetable intake (FVI), improve the social-cognitive variables of PA and FVI, and enhance mental health outcomes in comparison with control condition; and whether the social-cognitive variables would mediate the association between intervention and adopting a healthy lifestyle. The study findings may contribute to the current multiple health behaviour intervention research and support Chinese cardiac patients to maintain rehabilitation outcomes and cultivate a healthy lifestyle.
For the main study, the sample size will be estimated by using G*Power 3.1 software with MANOVA of repeated measures approach. For achieving a medium effect size of 0.25 (Duan et al., 2017), with a power (1-β) of 0.8 and an alpha of 0.05, the total sample size will be 116. Assuming a dropout rate of approximately 30%, a total of 166 participants will be required for the study evaluation.
All data will be analyzed by using SPSS 23.0 software. Independent samples t-tests and Chi2-tests will be adopted to examine the characteristics of drop out and compare the differences of baseline data at T1. Statistical significance will be set at 5% level (two-tailed). The intervention effects on behavioural, social-cognitive and mental health status-related indicators will be tested by conducting the multivariate analysis of variance (MANOVA) with repeated measures, with time (T1, T2 and T3) as the with-in subjects factor and group (IG and CG) as the between-subjects factor. Missing data will be imputed within each measurement point in time using the Expectation-Maximization (EM) method. Furthermore, the intervention effect on healthy lifestyle indicator will be examined by performing a multinomial logistic regression model. The multiple-mediator model will be conducted to test the mediation effects with the use of SPSS macro (Preacher & Hayes, 2008).
Guangdong General Hospital
Hong Kong Baptist University
Published on BioPortfolio: 2018-08-21T20:18:13-0400
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