Motivational predictors of increases in physical activity behaviour, health, and well-being among patients with Diabetes Mellitius Type 2 and cardiovascular disease: Testing self-determination theory in a randomized clincal trial
MetadataShow full item record
A randomized clinical trial tested an experimental model and the self-determination theory (SDT) process model of changes in physical activity (PA) behaviour, health, and wellbeing. Adult patients (N=137) of both sexes, all diagnosed with diabetes mellitus type 2 and cardiovascular disease, were recruited to a one-year experiment. They were randomly assigned to an organized exercise intervention group or to a non-exercise control group. At baseline and after 12 months we measured the following variables: perceived needs satisfaction and autonomy support, motivational regulations of PA, perceived competence for PA (PC), and perceived effort and quality of PA behaviour. In addition we measured general health and psychological well-being. Well-being was estimated by the subtraction of negative affect from the sum of positive affect, life satisfaction, and vitality. Of the patients who answered the questionnaire on baseline (65%, n=89), 70.8% (n=63) answered after one year. The experimental model was tested using a MANOVA repeated measures, followed with 7 ANOVA´s repeated measures. The SDT process model was tested using multiple regression analysis and path analysis (bootstrapping). The intervention produced significant increases in all study variables in favour of the experimental group. In addition, the data supported the SDT process model. As hypothesized, the intervention was positively related to needs satisfaction, need satisfaction related positively to autonomous motivation and PC, and autonomous motivation related positively to PA. PC related positively to PA, health and wellbeing. Furthermore, the direct effect of the intervention on well-being was positive and significant.
Masteroppgave - Norges idrettshøgskole, 2013