ABSTRACT
Objective: Grounded in self-determination theory and the stimulus-organism-response framework, this study examines factors that affect college students' leisure-time physical activity by considering the basic psychological needs satisfaction (i.e., autonomy, competence, and relatedness), self-determined motivation, emotional and cognitive involvement. Methods: The sample included 526 students (47.8 % male; 57.2 % female) from four universities in central China. A structural equation model was used to analyze associations among variables. Results: The satisfaction of all three basic psychological needs had a significant positive impact on emotional involvement. Additionally, autonomy and competence need satisfaction had a significant positive impact on self-determined motivation and cognitive involvement. However, contrary to our expectation, there was no significant effect of relatedness need satisfaction on self-determined motivation and cognitive involvement. Furthermore, emotional involvement was found to have a significant effect on leisure-time physical activity intention for male students. Interestingly, the relationship between cognitive involvement and leisure-time physical activity intention is significant, but this effect was observed only among female students. Conclusion: Pedagogical strategies and tactics better satisfied students' psychological needs, promote physical education classes emotional and cognitive involvement, therefore, achieve autonomous active lifestyle behaviors in leisure time.
ABSTRACT
BACKGROUND: The ability to predict posttraumatic stress disorder (PTSD) is a critical issue in the management of patients with mild traumatic brain injury (mTBI), as early medical and rehabilitative interventions may reduce the risks of long-term cognitive changes. The aim of the present study was to investigate how diffusion tensor imaging (DTI) metrics changed in the transition from acute to chronic phases in patients with mTBI and whether the alteration relates to the development of PTSD. METHODS: Forty-three patients with mTBI and 22 healthy volunteers were investigated. The patients were divided into two groups: successful recovery (SR, n = 22) and poor recovery (PR, n = 21), based on neurocognitive evaluation at 1 or 6 months after injury. All patients underwent magnetic resonance imaging investigation at acute (within 3 days), subacute (10-20 days), and chronic (1-6 months) phases after injury. Group differences of fractional anisotropy (FA) and mean diffusivity (MD) were analyzed using tract-based spatial statistics (TBSS). The accuracy of DTI metrics for classifying PTSD was estimated using Bayesian discrimination analysis. RESULTS: TBSS showed white matter (WM) abnormalities in various brain regions. In the acute phase, FA values were higher for PR and SR patients than controls (all P < 0.05). In subacute phase, PR patients have higher mean MD than SR and controls (all P < 0.05). In the chronic phase, lower FA and higher MD were observed in PR compared with both SR and control groups (all P < 0.05). PR and SR groups could be discriminated with a sensitivity of 73%, specificity of 78%, and accuracy of 75.56%, in terms of MD value in subacute phase. CONCLUSIONS: Patients with mTBI have multiple abnormalities in various WM regions. DTI metrics change over time and provide a potential indicator at subacute stage for PTSD following mTBI.
