Introduction: Self-determination theory (SDT) has been used widely to explain and predict human motivation in a variety of life contexts, including competitive sport (1, 2). Despite this popularity, no sport-specific instrument has been developed to measure some of the theory’s most central constructs the satisfaction of basic needs for competence, autonomy, and relatedness.
Methodology: In the present study 262 subjects that they had been selected from the Iranian adult athletes, have completed this questionnaire. These athletes (Mean age: 27.48 ± 5.25 years old) were male and female athletes. The confirmatory factor analysis and internal consistency (Cronbach's alpha method) were used to compute the BNSSS 's confirmatory factorial validity and reliability, respectively. Based on the confirmatory factor analysis, the validity of the BNSSS was justified (3 factors that include 21 statements-CFI:0.94; RMSEA:0.75; NNFI:0.93). Reliability of test (0.83) was obtained from the extracted factors (3 factors, 21 statements). So, BNSSS can be used for appraising the most important psychological factors in Iranian adult athletes.
Results: Based on the confirmatory factor analysis, the validity of the BNSSS was justified (3 factors that include 21 statements). Reliability of test (0.83) was obtained from the extracted factors (3 factors, 21 statements). So, BNSSS can be used for appraising the most important psychological factors in Iranian adult athletes.
Discussion: This psychological test can be used to assess the satisfaction of Iranian adult athletes in sport. So, it will be a step in the promotion of teams and athlete's goals.