| dc.description.abstract | 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. | no_NO |
