Temporal Sequencing of Physical Activity Change Constructs within the Transtheoretical Model

Physical Activity and Subjective Vitality in Female University Students: The Mediating Role of Decisional Balance and Enjoyment of the Activity

Regular physical activity (PA) improves the psychological well-being of those who practice it. However, female university students are a risk group due to their low level of PA. Based on the transtheoretical model of behavioural change, the main aim of this study was to examine whether the relationship between PA and subjective vitality was mediated by cognitive-emotional variables such as decisional balance (perceived benefits and barriers) and enjoyment associated with PA in a group of female university students. Participants were asked to complete self-administered questionnaires, which were available for one month via a Google Form. The results showed the existence of a statistically significant, relative, and indirect effect between the stage of change and subjective vitality via both mediating variables. Compared to females in the pre-contemplation stage, those in the action and maintenance stages achieved higher subjective vitality scores as a result of the effect of being in a more advanced stage on decisional balance and enjoyment of PA. It is concluded that female university students who reported regular PA found the activity to be more revitalising, stimulating, and exciting; all positive feelings and cognitions that translated into a more energetic and vital perception of themselves.

Revisiting the Transtheoretical Model for Physical Activity: A Large-Scale Cross-Sectional Study on Japanese-Speaking Adults

BACKGROUND

The Transtheoretical Model (TTM) has been the basis of health promotion programs, which are, for example, used to tailor behavioral interventions according to the stages of change. Empirical studies have shown that the TTM effectively describes the processes of behavioral adaptation to acquire healthier lifestyles; however, it has been argued that TTM-based interventions are not superior to non-TTM-based interventions for promoting physical activity (PA). Evidence has also highlighted some inconsistencies with theoretical assumptions, especially regarding how each process-of-change strategy emerges across the stages.

PURPOSE

Therefore, we investigated (a) how well the TTM describes the distributional characteristics of PA levels as well as other relevant variables (e.g., process of change, self-efficacy) across stages, and (b) how predictive the TTM variables are of PA levels within each stage.

METHODS

We analyzed data from 20,573 Japanese-speaking adults who completed online questionnaires on PA and TTM variables.

RESULTS

The results replicated previous findings that stage membership is associated with PA, the process of change, decisional balance, and self-efficacy, albeit with inconclusive evidence of temptations. Regression analyses revealed that some processes of change (self-reevaluation, reinforcement management, and self-liberation) were more predictive of PA in pre-active stages than in post-action stages; self-efficacy was predictive of PA only in the maintenance stage but not in the other stages.

CONCLUSIONS

Overall, the data support the theoretical assumptions of the TTM, but the stage specificity of the active processes may not always be consistent with the theory.

Effects of Pubertal Timing and Pubertal Tempo on Social Physique Anxiety, Self-determined Motivation, and Exercise in Early Adolescent Girls

PURPOSE

Research has shown that there is a decrease in physical activity levels during early adolescence, especially for girls. Previous studies have shown that the social physique anxiety (SPA) may be a controlling factor influencing exercise motivation and engagement in this behavior; however, the potential role that puberty plays in this decrease has not been considered until now. The objective of the present study was to examine the impact of pubertal timing and pubertal tempo on SPA and exercise motivation and behavior.

METHODS

Data from 328 early adolescent girls, aged between 9 and 12 at the time of joining the study, were collected in 3 waves over a 2-year period. Using structural equation modeling techniques, different 3-time-point growth models were estimated to examine if earlier maturing and compressed maturing in girls had differential effects on SPA and exercise motivation and behavior.

RESULTS

The results from growth analyses suggest that early maturing (according to all the pubertal indicators considered, except menstruation) tends to translate into (1) an increase in SPA levels and (2) a decrease in exercise - in the latter case, by reducing self-determined motivation. However, no differential effects from any of the pubertal indicators were found for compressed maturing in girls.

DISCUSSION

These results highlight the need for increased efforts toward developing programs aimed at helping early maturing girls to cope with the challenges of puberty with a particular focus on SPA experiences and exercise motivation and behavior.

The Transtheoretical model's processes of change in the heart of a physical activity intervention: A series of n-of-1

The objectives were a) to test whether a Processes of Change (POC)-personalized Transtheoretical model (TTM)-based intervention could increase physical activity (PA) among inactive adults, and b) to examine whether the intervention increased the level of TTM theoretical constructs. The following hypotheses were formulated: 1) PA levels will be significantly higher during and after the intervention in comparison to baseline measures; 2) the level of targeted POCs will increase during the intervention; 3) non targeted POCs will stay stable, and 4) self-efficacy and decisional balance levels will increase during the intervention. A series of N-of-1 with A (1 to 2-week)-B(10-week)-A'(2-week) design were conducted with 12 inactive adults. Behavioral counselors used behavior change techniques to target TTM constructs and supervise PA. Interventions were individualized based on the 5 POCs with the lowest pre-intervention level. Device-based and subjective PA along with TTM measures were collected weekly online. PA data were analyzed with piecewise linear models. A visual analysis was run to examine the TTM constructs. Device, self-reported and TTM data were available for five, seven and five participants, respectively. A significant self-reported PA increase for six participants was found during the phase B and A2. A significant device-measured PA increase was observed in two participants during the study. A substantial increase of targeted POC from baseline for all participants with available data was observed. This study provides the first evidence of behavioral and psychological effects of a POC-personalized TTM-based intervention in inactive adults.

Application of the Transtheoretical Model to Identify Physical Activity-Related Psychological Variables in Disabled Adults

OBJECTIVES The current study aimed at identifying the theoretical relation of the transtheoretical model (TTM) to explain physical activity in Korean adults with physical disabilities.METHODS A total of 194 participants ( Age Mean = 48.65 years) were voluntarily recruited for this study. Dissemination sources for participant recruitment included: (a) a press release issued through the authors’ university; (b) recruitment flyers posted on various websites (e.g., Independent Living Centers, Rehabilitation Research and Training Centers, Veteran’s Administration Hospitals); and (c) announcements made through and in conjunction with the Rehabilitation Research and Training Center on Health and Wellness consortium members. Through these procedures, 194 adults (80.83%) completed the survey form; there were 113 males (58.3%) and 81 females (41.7%). The remaining 46 (19.17%) were excluded because they did not complete the survey form or return.RESULTS Results indicated that the TTM constructs assessed were significantly (P < 0.001) associated with the stages of change for physical activity. The largest portion of variance was derived from the behavioral processes of change (ƞ2 = .40), followed by self-efficacy (ƞ2 = .30), the pros for exercise (ƞ2 = .19), the cognitive processes of change and the cons for exercise (ƞ2 = .16, respectively). Moreover, four discriminant functions (i.e., composite scores of the predictors) were produced in the first DDF analysis. These accounted for 71.0% (Wilks’ Λ = .31, χ2 [56] = 368.04, P < .001), 20.9% (Wilks’ Λ = .66, χ2 [39] = 129.91, P < 0.001), 6.3% (Wilks’ Λ = .88, χ2 [24] = 39.39, P < 0.05), and 1.8% (Wilks’ Λ = .97, χ2 [11] = 9.04, P = .62), respectively, of the between-group (stage of change) variability.CONCLUSIONS The results provide further cross-sectional support for the internal validity of the transtheoretical model, as the processes of change, self-efficacy, and decisional balance were important variables of a stage of change for physical activity, Additionally, the study is in general agreement with existing evidence among nondisabled populations and, therefore, it supports the external validation of TTM to a unique and understudied population segment.

Effect of the SNS-Based Physical Activity-Related Psychological Intervention on Physical Activity and Psychological Constructs among Inactive University Students

Background/Objective

The current study investigated the effects of the physical activity-related psychological intervention via social network service (SNS) on physical activity and psychological constructs in inactive university students.

Method

Thirty inactive university students participated in the 12-week intervention and received the physical activity-related psychological strategy via SNS. The physical activity levels, stages of physical activity, self-efficacy, pros, and cons were measured at the three time points (baseline, after 6 weeks, and after 12 weeks). Data analyses included frequency analysis, McNemar chi-square (χ²) test, and a repeated measures ANOVA were conducted.

Results

Results indicated that the number of inactive university students gradually decreased across the three different time points, and that a total physical activity of inactive university students significantly increased over the 12-week intervention. In addition, pros and self-efficacy significantly increased but cons gradually decreased over the intervention.

Conclusions

The current study suggests that the SNS-based physical activity-related psychological strategies have positive effects on promoting physical activity and its related psychological constructs for inactive university students.

Predictors of physical activity behavior change based on the current stage of change-an analysis of young people from Hawai'i

This study investigated the corresponding change between psycho-social predictors and physical activity (PA) behavior and if these relationships were dependent on the stages of change from the Transtheoretical Model in Minority American adolescents. We conducted a longitudinal field study with N = 357 students aged 13-18 years (M = 14.24 years, SD = 0.88); predominantly Filipino (61.2%) using a test-retest design assessing psycho-social PA predictors (enjoyment, self-efficacy, family support, friends' support, knowledge, stage of change) and moderate-to-vigorous physical activity (MVPA) at two time points over six months. Hierarchical regression results indicated that a positive change of enjoyment, knowledge about PA and family support predicted a change of MVPA, independently of stage. The time-varying covariation showed the importance of the current stage of change for enjoyment, self-efficacy and support of friends for a change of MVPA. Overall, our findings suggest that an individual's current stage of change should be considered to determine individually appropriate starting points and goals for designing interventions to promote PA among Minority American adolescents.

Development and Validation of the Workplace Decisional Balance Scale for Exercise (WDBex) in a French Sample

OBJECTIVE

Despite positive effects of physical activity programs in the workplace, an appropriate measurement instrument to capture employees' decisional balance to exercise is lacking. This study sought to develop and validate a decisional balance scale for exercise adapted to the workplace.

METHODS

Four complementary studies were carried out, with a total sample of 2398 French volunteer employees, to develop a preliminary version and examine its dimensionality, temporal stability, and construct validity.

RESULTS

The Workplace Decisional Balance scale for Exercise (WDBex) consists of 21 items with two subfactors, respectively composed of 12 items (facilitators) and nine items (barriers); for each subfactor, three dimensions (ie, physical, psychological, and logistic) were distinguished and presented satisfactory psychometric properties.

CONCLUSIONS

This instrument constitutes a reliable and valid instrument for studying the psychosocial determinants of physical activity engagement in the workplace and for developing health promotion strategies.