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Restrained Eating, Perceived Physical Strength, and Motivation in Physical Activity among Middle School Students: Comparisons in Gender and BMI

This study aims to investigate the gender differences in restrained eating, perceived physical strength, and motivation in physical activity, differences in those variables by BMI, and relationship between restrained eating and motivation in physical activity among middle school students. Participants were 483 students (male: 195, female: 288) who were studying at three middle schools located in Seoul, Korea. Age mean of participants was 15.1(SD=.63). The questionnaires and psychological tests used in this research included the following: The Intrinsic Motivation Inventory, Scale for Restrained Eating, and Perceived Physical Strength Scale. A t-test, Pearson-Product Moment, 2 (gender: male/female)×2 (BMI: low BMI/high BMI) 2-way MANOVAs were performed. Result revealed that female students or students who got higher BMI were more likely to restrain their eating behavior than male students or students who got lower BML Males were more likely to do physical activity with interest and enjoyment, competence, and choices than females, while females were more likely to do physical activity with pressure and tension. There were significant negative relationships between male students’ restraint eating and interest/enjoyment, perceived competence, and perceived choice among motivation in physical activity. There were significant positive relationship between male students’ restraint eating and pressure/tension among motivation in physical activity. For female students, there was a negative relationship between restraint eating and perceived choice among motivation in physical activity.