Obesity and asthma share changes that may begin in the fetal development phase. The endophenotype obesity-asthma presents as main characteristic a pattern of inflammatory response different from the habitual Th2 profile of cytokines. In these obese patients, possible changes in the diaphragm muscle can directly influence the dynamics of pulmonary ventilation significantly.

Due to the importance of the diaphragm in pulmonary ventilation, this study will be performed to verify possible alteration in the excursion and diaphragmatic thickness of adolescents with endophenotype obesity-asthma. In parallel, the possible underlying etiopathogenic substrate of this endophenotype will be explored through the dosing of muscle enzymes and inflammatory cytokines and obesity hormones.

Inclusion Criteria:

• Adolescents of both sexes, aged 12-21 years;
• For the obesity groups, BMI for gender and age equal to or greater than the 97th percentile;
• Clinical diagnosis of persistent, moderate and severe asthma by a specialist physician and its severity classified according to the GINA (Global Initiative Against Asthma) criteria.

Exclusion Criteria:

• Adolescents with a diagnosis of cardiovascular, rheumatic, osteoarticular, neuromuscular or any other disease that limits the safe performance of the tests proposed by the protocol will be excluded; And those who do not agree to participate in the study.

108 adolescents aged 12 years to 21 years will be recruited, of all sexes