Analysis of mediation and reciprocal effects of changes in weight, self-esteem, and exercise in a behavioral weight loss treatment

Improving the treatment of obesity remains a critical challenge. Several health behaviour change models, often based on a social-cognitive framework, have been used to design weight management interventions (Baranowski et al., 2003). However, most interventions have only produced modest weight reductions (Wadden et al., 2002) and socialcognitive variables have shown limited power to predict weight outcomes (Palmeira et al., 2007). Other predictors, and possibl alte nati e e planatory models, are needed to better understand the mechanisms by which weight loss and other obesity treatment-outcomes are brought about (Baranowski, 2006). Self-esteem is one of these possible mechanisms, because is commonly reported to change during the treatment, although these changes are not necessarily associated with weight loss (Blaine et al., 2007; Maciejewski et al., 2005). This possibility should be more evident if the program integrates regular exercise, as it promotes improvements in subjective well-being (Biddle & Mutrie, 2001), with possible influences on long-term behavioral adherence (e.g. diet, exercise). Following the reciprocal effects model tenets (Marsh & Craven, 2006), we expect that the influences between changes in weight, selfesteem and exercise to be reciprocal and might present one of the mechanisms by which obesity treatments can be improved.

Emoções positivas e motivação na reabilitação biopsicossocial

RESUMO: O presente estudo tem como principal objectivo verificar o fluxo emocional e a motivação para a mudança num programa de reabilitação biopsicossocial de alcoolismo e toxicodependências, com a duração de quatro semanas. Para esse efeito, procedeu-se à recolha da amostra de 30 participantes dentro do programa, utilizando para avaliar o fluxo emocional os relatos de episódios emocionais, o Teste de Positividade (TP), a Analogical Emotional Scale (AES), o Subjective Well-being (SWB), o Controlo Percebido Subjectivo (CPS) em três momentos distintos do programa, pelo que para avaliar a motivação foi utilizada a escala SOCRATES 8D no inicio e no final do programa de reabilitação. A teoria argumenta a existência de um aumento na satisfação pessoal e nas emoções positivas durante o processo de mudança, ou seja, quando o processo terapêutico decorre de forma favorável. Os resultados confirmam a existência de uma evolução linear positiva no TP, como também no SWB e CPS. Contudo não foi totalmente confirmado um aumento positivo da motivação, pelo que os resultados apenas demonstraram diferenças significativas na subescala Ambivalência da escala SOCRATES 8D, verificando-se um decréscimo acentuado entre os dois momentos, o que se revela favorável para o processo de mudança desejado no programa. ABSTRACT: The main objective of this study is to verify the emotional flow and the motivation for change process in a bio-psychosocial rehabilitation program for alcoholism and drug addictions, with a duration of four weeks. To this end, we proceeded to collect the sample of 30 participants in the program, to evaluate the emotional flow we use the emotional reports, the Positivity Test (PT), the Analogical Emotional Scale (AES), the Subjective Well-Being (SWB), the Subjective Perceived Control (PSC) in three separate moments of the program, to assess the motivation scale was used the SOCRATES 8D scale at the beginning and in the end of the rehabilitation program. The theory argues that there is an increase in personal satisfaction and positive emotions during the change process, when the therapeutic process runs optimally. The results confirm the existence of a positive linear trend in the PT, in SWB and CPS. However it was not totally confirmed an positive increase in motivation, so the results only showed significant differences in ambivalence subscale of the SOCRATES 8D, and there is a sharp decrease between the two moments, which proves favorable for the desired process of change in the program.