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Title: Effect-evaluatie van drie levensstijlinterventies ter promotie van de fysieke activiteit bij volwassenen
Other Titles: Evaluating the effectiveness of three lifestyle physical activity interventions in adults
Authors: Opdenacker, Joke
Issue Date: 12-May-2009
Abstract: The aim of the present doctoral thesis was to evaluate the effectiveness of three physical activity interventions with various strategies to fac ilitate implementation. More specifically, we wanted to examine if inter ventions that are less money and time consuming can also be successful. In the first intervention study among sedentary university employees we examined the effectiveness of a 3-month coaching program. This coaching program consisted of one intake session with a physical activity coach f ollowed either by four face-to-face support contacts, or by four telepho ne support contacts. The results showed that, besides a minor difference on active transportation in favor of the face-to-face program, both int erventions were equally effective in motivating sedentary university emp loyees to become more physically active and in improving their mental he alth. In particular, both interventions significantly increased leisure- time physical activity, self-efficacy and social support and decreased s itting time and trait anxiety. Because programs with telephone support a re cheaper and require less time and effort from both the coach and the participant, it was concluded that a coaching program with telephone sup port can be preferred to the same program with face-to-face support. In the second intervention study we evaluated the effects of a 11-month lifestyle physical activity intervention, including an individualized ho me-based program supported by phone calls, and a 11-month structured exe rcise intervention, consisting of three weekly supervised sessions in a private fitness center, in adults over 60 years old. The results were co mpared with an assessment-only control group. The physical activity resu lts showed that at the end of the interventions both programs had signif icantly increased the total physical activity level of the participants. However, one year after the end of the interventions the structured pro gram was no longer superior to the control group. By contrast, the lifes tyle program still showed larger increases in physical activity, in part icular in active transportation and daily steps. The results concerning the psychological effects indicated that both interventions had signific ant positive effects on physical self-perceptions in both the short as t he long term. Because the lifestyle intervention outperformed the struct ured intervention on the long term physical activity effects and because it was almost four times cheaper than the structured intervention, it w as concluded that a home-based lifestyle intervention should be preferre d to a center-based structured intervention in the promotion of physical activity in older adults. In a third intervention study, maximal attention was paid to facilitating lat er implementation by integrating a physical activity intervention into t he existing structures of a women’s organization and by limiting the amo unt of contact hours. This minimal-contact intervention consisted of one group meeting, a self-help booklet and five reminder letters. The inter vention had a significant positive effect on objectively measured physic al activity, on psychological well-being and on trait anxiety. The chang es in psychological well-being and trait anxiety were partially mediated by changes in perceived benefits and barriers of physical activity and by changes in self-efficacy, but not by changes in physical activity. No ne of the examined psychosocial constructs (i.e., perceived benefits of physical activity, perceived barriers of physical activity, behavioral p rocesses of change, experiential processes of change, self-efficacy, soc ial support) mediated the intervention effect on physical activity. The positive effects of this intervention on physical activity and mental he alth are especially valuable with regard to the special efforts that wer e made to increase the implementation possibilities of this intervention because strategies such as limiting the number of contact hours can hyp othesize the effectiveness of an intervention. Moreover the strategies t o increase the implementation possibilities of this intervention paid of f, because the intervention was implemented on a national scale by the w omen’s organization itself. Overall it was concluded that physical activity interventions that are l ess money and time consuming can also be effective. Moreover, they are often more cost-effective than their more expensive and intensive c ounterparts. By consequence, in order to achieve a public health impact it is important to focus on strategies that can facilitate later impleme ntation during the development of physical activity interventions.
URI: 
Publication status: published
KU Leuven publication type: TH
Appears in Collections:Physical Activity, Sports & Health Research Group
Departement Sociaal-agogisch Werk - KHLim
Research Centre for Exercise & Sport Psychology, and Coaching (-)
Exercise Physiology Research Group
Policy in Sports & Physical Activity Research Group

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