摘要:The purpose of this study was to examine grade and gender differences in students’ self-determination for participating in school physical education. Participants were 1385 Greek students, 681 boys and 704 girls, of 5th (n=358), 7th (n=348), 9th (n=346) and 11th grade (n=333), which participated in 72 regular physical education classes from 33 schools of 11 cities in central and north Greece. The combination of the motivational regulations, which were evaluated with the Greek version, adapted for the physical education settings, of the Motivational Orientations Questionnaire, with the addition of the amotivation subscale, resulted in self-determination index. The 4 (grade) X 2 (gender) analysis of variance and the post hoc comparisons after the Bonferoni adjustment in α level, revealed significant reduction in students’ self-determination across the grades with the exception of 9th and 11th comparison. Boys in comparison with girls referred higher levels of self-determination only in 11th grade. In conclusion, the results indicated that students’ self-determination for participating in physical education declined with age for both gender. These results highlight the need of Greek physical education to become more appealing, effective and useful for all students, especially in secondary and high school.