Psychological Measures and BMI-SDS among Adolescents with Obesity and Different Motivational Stages in Inpatient Rehabilitation

Abstract

Obesity is strongly represented in adolescents, showing a high persistency until adulthood. Previous studies displayed short term effects of inpatient rehabilitation, but failed to demonstrate sustainability. Long-term effects might be expected when taking the motivational stage of adolescents into account. However, there is no evidence regarding motivational stages in obese adolescents in German inpatient rehabilitation. The current study investigated psychological measures and the Body-Mass-Index-standard deviation score (BMI-SDS) in obese adolescents related to motivational stages and age. A total sample of n=127 adolescents were included in this cross-sectional study during their inpatient rehabilitation intake. Differences in BMI-SDS and self-reported psychological health were analyzed using 2-way analysis of covariance with the factors motivational stage (intender vs. actor) and age (12-14 vs. 15-17 years), and the covariate gender. Motivational stages were assessed using the newly developed questionnaire to classify motivational stages (Fragebogen zur Einteilung in Motivationsstadien; MoS). Intenders reported unfavorable disease management and volitional parameters. Younger participants reported a lower BMI-SDS as well as lower motivational and volitional parameters. A risk profile emerged for younger intenders which was characterized by psychological problems. The results provide important insights for the design of motivational stage-based training programs and underpin the need for age-specific therapies during adolescence.