Purpose: We aimed to identify factors influencing physical activity in adolescents with complex congenital heart disease. Methods:
We recruited 92 adolescents with complex congenital heart disease from a tertiary medical center in Seoul, measured their levels
of physical activity, and identified factors that influenced their physical activity levels using the Global Physical Activity
Questionnaire, the New York Heart Association classification, congenital heart disease complexity, the Self-Efficacy Scale, and the
Parental Bonding Instrument scale. Stepwise multiple linear regression was used to determine factors influencing physical
activity. Results: Total physical activity was higher in males than in females (t=4.46, p<.001). Adolescents who participated in
school physical education classes engaged in more physical activity than those who did not (t=6.77, p<.001). Higher self-efficacy
(β=.41, p<.001), male gender (β=.37, p<.001) and participation in school physical education classes (β=.19, p=.042) were associated
with a higher likelihood of engagement in physical activity. Conclusion: It is necessary to develop nursing interventions that
enhance self-efficacy in order to promote physical activity in adolescents with complex congenital heart disease. Physical activity
should also be promoted in an individualized manner, taking into account gender, disease severity, and parental attitude.