The sweet taste of success: the presence of glucose in the oral cavity moderates the depletion of self-control resources.

According to the resource-depletion model, self-control is a limited resource that is depleted after a period of exertion. Evidence consistent with this model indicates that self-control relies on glucose metabolism and glucose supplementation to depleted individuals replenishes self-control resources. In five experiments, we tested an alternative hypothesis that glucose in the oral cavity counteracts the deleterious effects of self-control depletion.

Theoretical integration and the psychology of sport injury prevention.

Integrating different theories of motivation to facilitate or predict behaviour change has received an increasing amount of attention within the health, sport and exercise science literature. A recent review article in Sports Medicine, by Keats, Emery and Finch presented an integrated model using two prominent theories in social psychology, self-determination theory (SDT) and the theory of planned behaviour (TPB), aimed at explaining and enhancing athletes' adherence to sport injury prevention. While echoing their optimistic views about the utility of these two theories to explain adherence in this area and the virtues of theoretical integration, we would like to seize this opportunity to clarify several conceptual principles arising from the authors' integration of the theories.

Self-determined forms of motivation predict sport injury prevention and rehabilitation intentions.

Objectives: Two studies were conducted to examine how motivational regulations from self-determination theory (SDT) influenced athletes' intentions towards sport-injury rehabilitation (Study 1) and prevention behaviours (Study 2) using the theory of planned behaviour (TPB) as a framework.

Design: A cross-sectional survey was employed.

Methods: Elite athletes (Study 1: N=214; Study 2: N=533) completed the Treatment Self-Regulation Questionnaire and psychometric measures of constructs from the TPB, with respect to their rehabilitation from sport injury in a hypothetical scenario (Study 1), or their injury prevention experiences (Study 2).

Rationale, design and methods for a staggered-entry, waitlist controlled clinical trial of the impact of a community-based, family-centred, multidisciplinary program focussed on activity, food and attitude habits (Curtin University's Activity, Food and Attitudes Program--CAFAP) among overweight adolescents.

Background: Current estimates place just under one quarter of adolescents in Australia as overweight or obese. Adolescence has been identified as a critical period for the development of obesity, yet despite this recognition, there is limited systematic research into or evaluation of interventions for overweight adolescents. Reviews have concluded that there is a substantive evidence gap for effective intervention, but physical activity, lifestyle change and family involvement have been identified as promising foci for treatment.

Investigating the predictive validity of implicit and explicit measures of motivation in problem-solving behavioural tasks.

Research into the effects of individuals'autonomous motivation on behaviour has traditionally adopted explicit measures and self-reported outcome assessment. Recently, there has been increased interest in the effects of implicit motivational processes underlying behaviour from a self-determination theory (SDT) perspective. The aim of the present research was to provide support for the predictive validity of an implicit measure of autonomous motivation on behavioural persistence on two objectively measurable tasks.

When effects of the universal psychological need for autonomy on health behaviour extend to a large proportion of individuals: a field experiment.

Objective: Based on tenets of self-determination theory, the present manuscript examined the hypothesis that a physical activity intervention programme that supported the universal psychological need for autonomy would motivate a large proportion of young individuals to engage in physical activity. In contrast, we hypothesized that interventions that did not support the universal psychological need for autonomy would motivate a smaller proportion of young individuals to endorse the physical activity programme.

Method: A field experiment was conducted.

The predictive validity of implicit measures of self-determined motivation across health-related behaviours.

Objective: Research on health-related behaviour has typically adopted deliberative models of motivation and explicit measures. However, growing support for implicit processes in motivation and health-related behaviour has caused a shift towards developing models that incorporate implicit and explicit processes.

Methods: The current research advances this area by comparing the predictive validity of a newly developed implicit measure of motivation from self-determination theory (SDT) with explicit measures of motivation for 20 health-related behaviours, in a sample of undergraduate students (N= 162).

The effectiveness of a motivational interviewing primary-care based intervention on physical activity and predictors of change in a disadvantaged community.

Little research exists on the impact of behavior change interventions in disadvantaged communities. We conducted a prospective study to explore the effectiveness of motivational interviewing on physical activity change within a deprived community and the social- psychological and motivational predictors of change in physical activity including stage of change, self-efficacy, social support, and variables from self-determination theory and the theory of planned behavior. Five motivational interviewing counsellors recruited 207 patients and offered motivational interviewing sessions to support physical activity behavior change.

A theory-based intervention to reduce alcohol drinking in excess of guideline limits among undergraduate students.

Objectives: Undergraduate students frequently exceed guideline limits for alcohol intake in a single session and are highly susceptible to associated health, social, and economic problems. Psychological theory suggests that interventions aimed at reducing alcohol consumption should target both motivational and volitional phases of action to be effective. This study reports an integrated theory-based intervention aimed at reducing undergraduates' alcohol consumption in excess of guideline limits.

Predicting alcohol consumption and binge drinking in company employees: an application of planned behaviour and self-determination theories.

Objectives: This study tested an integrated model of the psychosocial determinants of alcohol-related behaviour among company employees from four nations. A motivational sequence was proposed in which motivational orientations from self-determination theory influenced intentions to consume alcohol within guideline limits and alcohol-related behaviour via the mediation of the theory of planned behaviour variables of attitude, subjective norms, and perceived behavioural control (PBC).

Design: A three-wave prospective design using self-reported psychological and behavioural measures.

Age shall not weary us: deleterious effects of self-regulation depletion are specific to younger adults.

Self-regulation depletion (SRD), or ego-depletion, refers to decrements in self-regulation performance immediately following a different self-regulation-demanding activity. There are now over a hundred studies reporting SRD across a broad range of tasks and conditions. However, most studies have used young student samples.

Investigating the predictive validity of implicit and explicit measures of motivation on condom use, physical activity and healthy eating.

The literature on health-related behaviours and motivation is replete with research involving explicit processes and their relations with intentions and behaviour. Recently, interest has been focused on the impact of implicit processes and measures on health-related behaviours. Dual-systems models have been proposed to provide a framework for understanding the effects of explicit or deliberative and implicit or impulsive processes on health behaviours.

Effectiveness of a brief intervention using mental simulations in reducing alcohol consumption in corporate employees.

A theory-based intervention aimed at reducing corporate employees' alcohol consumption in excess of guideline limits is presented. The intervention adopted an outcome mental simulation technique and was administered to a sample of corporate employees from three companies. A single-arm randomized-controlled design was adopted.

When small losses do not loom larger than small gains: effects of contextual autonomy support and goal contents on behavioural responses to small losses and small gains.

Based on the tenets of self-determination theory, the present studies examined the moderating effects of interpersonal contexts or goal conditions that afforded satisfaction of psychological needs on loss aversion effects. We hypothesized that behavioural responses to small losses would be stronger relative to behavioural responses to small gains under goal conditions or interpersonal contexts that did not support psychological needs. We also expected the effect to be minimized under goal conditions or interpersonal contexts that supported psychological needs.

An intervention to reduce alcohol consumption in undergraduate students using implementation intentions and mental simulations: a cross-national study.

Background: Excessive alcohol consumption has been linked to deleterious health consequences among undergraduate students. There is a need to develop theory-based and cost-effective brief interventions to attenuate alcohol consumption in this population.

Purpose: The present study tested the effectiveness of an integrated theory-based intervention in reducing undergraduates' alcohol consumption in excess of guideline limits in national samples from Estonia, Finland, and the UK.

Do people differentiate between intrinsic and extrinsic goals for physical activity?

The distinction between intrinsic and extrinsic goals, and between goal pursuit for intrinsically and extrinsically motivated reasons, is a central premise of self-determination theory. Proponents of the theory have proposed that the pursuit of intrinsic goals and intrinsically motivated goal striving each predict adaptive psychological and behavioral outcomes relative to the pursuit of extrinsic goals and extrinsically motivated goal striving. Despite evidence to support these predictions, research has not explored whether individuals naturally differentiate between intrinsic and extrinsic goals.

The reciprocal relationship between physical activity and depression in older European adults: a prospective cross-lagged panel design using SHARE data.

Objective: The aim of this prospective study was to investigate the reciprocal nature of the physical activity-depressive symptoms relationship in 17,593 older adults from 11 European countries older adults (M age = 64.07, SD = 9.58) across two-year follow-up.

The importance of importance in the physical self: support for the theoretically appealing but empirically elusive model of James.

This study tested James's theoretical assumption that the importance people attribute to different physical self-domains, in combination with perceived competence in those domains, influences higher order self-concepts. Data from four large samples (total N=1,831) from Sweden, Great Britain, Portugal, and Turkey were analyzed. A new version of an instrument, the Physical Self-Perception Profile-Revised (PSPP-R), was used to measure perceived competence and importance of physical self-domains, along with global self-esteem.

Health and doping in elite-level cycling.

The protection of the health of athletes is one of the three criteria taken into account when registering a substance in the World Anti-Doping Agency prohibited list. Nevertheless, in elite-level cycling, banned substance use is widespread. The present research adopted a psychological approach to examine how or whether perceived health risks influence elite-level cyclists' decisions to use banned substances.

Sport education and extracurricular sport participation: an examination using the trans-contextual model of motivation.

In this study, we used the trans-contextual model of motivation (TCM) to examine the effect of Sport Education (SE) on students' participation in a voluntary lunch recess sport club. A total of 192 participants (ages 9-14 years) completed measures of the TCM constructs before and after a 12-week SE intervention period. Participants had the opportunity to participate in weekly, voluntary lunch recess sport club sessions during the intervention period.

Testing an integrated model of the theory of planned behaviour and self-determination theory for different energy balance-related behaviours and intervention intensities.

Objectives: The aim of the study was to test the relations between constructs from the self-determination theory (autonomous and controlled motivation), the theory of planned behaviour (attitudes, self-efficacy, and intentions), and behaviour change within a theoretically integrated model. Additionally, the aim was to test if these relations vary by behaviour (physical activity or dietary behaviour) or intervention intensity (frequency).

Design: It was a randomized controlled trial with a 'usual care' condition (medical screening only) and an intervention condition (medical screening+access to a website and coaching).

Factorial validity and measurement invariance of the Revised Physical Self-Perception Profile (PSPP-R) in three countries.

The revised physical self-perception profile (PSPP-R) was constructed to measure both perceived competence and importance linked to domains of the physical self. In the present study, we tested the factorial validity of the PSPP-R, using confirmatory factor analytic approach, on samples of university students from three different countries: Sweden, Turkey, and the UK. Multi-sample covariance structure analyses were also used to test the invariance of the PSPP-R across the three national samples.

The development of a scale measuring integrated regulation in exercise.

Objectives: This research aimed to develop and validate a measure of integrated regulation based on self-determination theory (SDT) in an exercise context.

Design: Cross-sectional and prospective surveys were employed.

Methods: The measure was developed from first principles from an initial item pool and items were selected using expert evaluators.

Ego depletion and the strength model of self-control: a meta-analysis.

According to the strength model, self-control is a finite resource that determines capacity for effortful control over dominant responses and, once expended, leads to impaired self-control task performance, known as ego depletion. A meta-analysis of 83 studies tested the effect of ego depletion on task performance and related outcomes, alternative explanations and moderators of the effect, and additional strength model hypotheses. Results revealed a significant effect of ego depletion on self-control task performance.

Social physique anxiety and physical self-esteem: gender and age effects.

The aim of this study was to test the generalisability of the factor pattern, structural parameters, factor correlations and latent mean structure of social physique anxiety and physical self-esteem across gender, age and gender x age. The social physique anxiety scale and general physical self-esteem scale from the physical self-perception profile was administered to high school and university students aged 11-24 years (N = 2334). Confirmatory factor analysis (CFA) was used to test the adequacy of a two-factor correlated model in the full sample, and separately by gender, age and gender x age sub-samples.