Explicit and implicit attitudes towards food and physical activity in childhood obesity

This study investigated differences in the explicit and implicit attitudes towards food and physical activities between children with obesity (n=38) and a matched control group (n=38). The implicit attitude was assessed using the Extrinsic Affective Simon Task (EAST; J. Exp. Psychol. (50) (2003) 77), a modified version of the Implicit Association Test (IAT; J. Personality Social Psychol. (74) (1999) 1464). It was expected that both groups would report a positive explicit attitude towards healthy food and intense physical activities, and a negative explicit attitude towards unhealthy food and sedentary activities. Of particular interest was the hypothesis that children with obesity would have a more positive implicit attitude towards unhealthy food and sedentary activities than the control group. Results revealed no differences between groups in the explicit attitude towards food and physical activity. Children and adolescents with obesity had a more pronounced positive implicit attitude towards food in general. The relevance of these findings in terms of prevention, treatment and further research is discussed.     

Testing mediator variables in a physical activity intervention for women with type 2 diabetes

ObjectivesA limited understanding of the mechanisms of behavior change has hindered the development of more effective interventions. The aim of this study was to identify potential mediators of objectively measured physical activity (PA) behavior change in women with type 2 diabetes (T2DM).DesignMediation test of a randomized controlled trial.MethodWomen with T2DM (n = 93) from the control group (standard PA materials, n = 44) and the full intervention group (control + stage-matched printed material and telephone counseling, n = 49) of a larger PA intervention trial were included. PA outcomes were minutes of MET weighted moderate and vigorous PA/week (self-report) and steps/3-days (objective) recorded at baseline and 12-months. Social-cognitive constructs were measured and tested in a mediating variable framework.ResultsPerceived behavioral control and barrier self-efficacy mediated intervention effects on objective PA (proportion of intervention effect mediated = 18% and 24% respectively). Intention was a mediator of objective PA (23%).ConclusionPerceived behavior control, barrier self-efficacy, and intention are effective mechanisms of PA behavior change in women with T2DM.     

The effects of a physical activity and nutrition intervention on body dissatisfaction, drive for thinness, and weight concerns in pre-adolescents

The primary aim was to examine the effects of a physical activity and nutrition intervention on Body Dissatisfaction, Drive for Thinness, and Weight Concerns in pre-adolescents. Eighty-four 10–12 years old were studied as part of a larger trial of a family-based physical activity and nutrition intervention. Forty-nine children participated in the 8-week intervention (35 in control group) and completed Body Dissatisfaction, Drive for Thinness, and Weight Concerns measures at baseline and post-test. Participants in both groups showed positive but non-significant changes in body image and Drive for Thinness following the trial, but there were no significant between group differences. This was the first study to examine the effects of a physical activity and nutrition intervention on body image and related variables in pre-adolescents. Body Dissatisfaction, Drive for Thinness, and Weight Concerns were not positively or negatively influenced by the intervention.     

Mediators of behavior change in two tailored physical activity interventions for adolescent girls

ObjectivesIt has been suggested that the lack of knowledge regarding the mechanisms responsible for behavior change may be responsible for the low levels of effectiveness in physical activity interventions among youth. While it is common for physical activity interventions to cite a theoretical framework, few test the validity of their constructs using an established mediation analysis technique. The purpose of this study was to identify mediators of physical activity behavior change in two tailored interventions for adolescent girls.DesignThis study involved an experimental design.MethodsParticipants (N=161) were randomly allocated to a control (CON) group, an intervention based on the Health Promotion (HP) Model or an intervention developed from the HP Model that included two processes from the Transtheoretical Model (THP). Both interventions included school-based education sessions, individual counseling sessions, and two physical activity sessions completed with the participants' mothers. Measures were assessed prior to the intervention, at post-intervention and at a 6-month follow-up. The following constructs were included in the mediation analyses: perceived benefits, perceived barriers, self-efficacy, exposure to models, social support, interpersonal norms, planning, stimulus control, and counterconditioning.ResultsPerceived benefits, perceived barriers, self-efficacy, and commitment to planning satisfied the criteria for mediation in the THP intervention. Self-efficacy and commitment to planning were identified as mediators in the HP intervention.ConclusionThe results of this study provide evidence that both interventions were successful in increasing physical activity through changes in the theoretical constructs.     

Theoretical underpinnings of a need-supportive intervention to address sustained healthy lifestyle changes in overweight and obese adolescents

ObjectivesRecent figures indicate that nearly a quarter of Australian adolescents are overweight or obese. Despite the well-established role of physical activity and healthy eating in reducing prevalence of obesity, there remains a lack of effective interventions that promote sustained behavior engagement. This paper aims to describe the theory-based integration and implementation of self-determination theory and goal setting theory in a family-based lifestyle intervention. Although these theories have been shown to independently predict motivation for behavior, a limited number of studies have described behavior-change techniques at a level to allow for effective evaluation and replication, and no studies have combined the theories in a healthy lifestyle behavior intervention.MethodsBehavior change techniques and the associated change mediators are described in relation to need-supportive environments provided by instructors and extended to parents in the home environment. Methods for motivating and promoting sustained engagement in adolescent physical activity and healthy eating and parent behaviors to support these lifestyle changes are discussed within the context of need-satisfaction and goal setting.ConclusionsThis study will contribute to understanding processes for developing and implementing behavior-change techniques based on the integration of two theories of motivation. Future interventions aimed at promoting maintenance of physical activity and healthy eating behaviors in overweight and obese adolescents will benefit by being informed of which techniques are effective at enhancing motivation within the intervention context and home environment.     

Physical activity interventions in the school setting: A systematic review

Objectives

To review the effectiveness of school-based interventions with a physical activity component by measuring changes in psychological determinants, physical activity, and health outcomes.

Design

Systematic Review.

Method

We conducted a literature search of school-based controlled studies that involved a physical activity intervention targeting school students. Study design, methodological quality, and effectiveness of interventions on three target levels, ‘health and fitness’ (BMI and motor performance), ‘physical activity’, and ‘psychological determinants’ (knowledge of physical activity effects, self-concept, and attitudes towards physical activity), were analysed. Furthermore, we examined the influence of specific factors (e.g., age and gender) and mediator effects.

Results

The literature search identified 129 studies. The majority of the studies examining motor performance, physical activity, and knowledge of physical activity achieved significant results (69.7%, 56.8% and 87.5%, respectively). Significant effects on self-concept and attitudes were also found but to a smaller extent (in 30% and 43.8% of the studies, respectively). Only a few studies examining BMI (2.7%), physical activity (6.8%), and attitudes towards physical activity (12.5%) revealed negative effects, with better results observed for the control group. Intervention effects were influenced by the students’ age, intervention type, and frequency of the interventions. Self-efficacy was found to mediate the relationship between the program and the students’ physical activity.

Conclusions

Numerous school-based physical activity interventions achieved positive effects on three target levels. Further research is needed to clarify the mediator effects of psychological variables on physical activity and health and to increase our knowledge about the mechanisms that underlie behavioural change.     

An experimental investigation of physical education teachers’ and coaches’ reactions to weight-based victimization in youth

Objectives

Overweight youth are frequent targets of weight-based victimization during Physical Education (PE) and sports. In addition, previous research indicates that teachers’ perceptions and expectations may influence their likelihood of intervening during victimization, and physical educators may endorse biased perceptions and expectations of overweight youth. Despite this evidence, no research has examined how physical educators respond to weight-based victimization of their students. Thus, the current study examined PE teachers’ and coaches’ responses to different types of victimization involving average weight and overweight students.

Design

This study utilized an experimental design that assessed participants’ reactions to situations of weight-related victimization using hypothetical scenarios accompanied by photographs of youth.

Methods

PE teachers and sport coaches (N = 162) were randomly presented with a scenario and follow-up questions about an average weight or an overweight student. Each participant completed two conditions: one with a male target, and one with a female target.

Results

Participants were more likely to take action when overweight female students were victims of bullying, specifically in situations of verbal and relational victimization. Male participants were less likely to respond to victimization than female participants.

Conclusions

Findings suggest the importance of increasing awareness about weight-based victimization and its consequences, especially among male physical educators. Implications for the psychological, social, and physical development of overweight youth are discussed.     

A pilot study exploring the use of a telephone-assisted planning intervention to promote parental support for physical activity among children and youth with disabilities

Parent support is an important contributor to physical activity (PA) among children and youth with disabilities (CYD). Although many parents of CYD are motivated to provide parent PA support, CYD remain insufficiently active. The multi-process action control model has been applied to understand parent PA support and highlights behavioral regulation strategies such as action and coping planning as critical for translating intentions into behavior. Parents may struggle to create and carryout planning without support. There is no known research examining telephone support as a tool to promote planning and subsequent parent PA support behavior.MethodParents (43 mothers and 6 fathers) of CYD (child M_age = 12.53 years ± 5.53; 75% male; 38.6% developmental disability) completed a baseline questionnaire and were subsequently randomized to a telephone-assisted planning experimental group twice over four weeks (n = 23) or a control group who had access to planning tools but no telephone assistance (n = 26).ResultsNo significant main or interaction effects emerged for parent PA support behavior. However, a significant time × condition interaction was found for behavioral regulation strategies (i.e., action and coping planning and self-monitoring; F(1,44) = 5.05, p = 0.03) indicating a significant increase in the use of behavioral regulation strategies for parent PA support from baseline, for parents assigned to the telephone-assisted intervention.ConclusionThese findings suggest potential for planning support as a tool to enhance behavioral regulation strategies related to parent PA support among parents of CYD.