Psychometric Assessment of the Need Satisfaction and Frustration Scale with Professional Romanian Athletes

Background: Although athletes' experiences of autonomy, competence, and relatedness play in key role in their motivation, performance-related outcomes, and wellness, there is no evidence to date on measures of autonomy, competence, and relatedness in the Romanian sport context. Building upon self-determination theory, the objective of this research was to adapt the Need Satisfaction and Frustration Scale and analyze its psychometric properties in the Romanian sport context. Methods: The participants were 642 professional athletes (354 males and 288 females; M-age = 22.81, SD = 5.78) who competed at the international and/or national level. Results: The results from confirmatory factor analyses psychometrically supported a six-factor correlated model, which was invariant across gender, age, and sport. Convergent validity was met by average variance extracted values between 0.60 and 0.74. Discriminant validity was underpinned by values from -0.72 to 0.72 for a heterotrait-monotrait ratio of correlations among the six factors. Reliability was endorsed by Cronbach's alpha scores between 0.75 and 0.89, and between 0.76 and 0.89 for Raykov's composite reliability coefficient. Criterion validity was supported by positive relationships of autonomy, competence, and relatedness satisfaction to autonomous motivation, and positive associations of autonomy, competence, and relatedness frustration with controlled motivation and amotivation. Conclusions: The Need Satisfaction and Frustration Scale is shown to be a valid and reliable measure of need satisfaction and frustration in professional Romanian athletes.