In addition to conventional exercises and electrical stimulation to the lower extremity muscles performed 5 days per week for 6 weeks, participants will receive 45 minutes of robotic rehabilitation, 45 minutes of occupational therapy, 45 minutes of hydrotherapy, and a 45-minute pulmonary rehabilitation program twice weekly, including diaphragmatic breathing training, chest wall mobilization, respiratory muscle-supportive exercises, and interventions aimed at postural alignment and sitting positioning.

In addition to conventional exercises and electrical stimulation to the lower extremity muscles performed 5 days per week for 6 weeks, participants will receive 45 minutes of robotic rehabilitation, 45 minutes of occupational therapy, 45 minutes of hydrotherapy, and a 45-minute pulmonary rehabilitation program twice weekly, including diaphragmatic breathing training, chest wall mobilization, respiratory muscle-supportive exercises, and interventions aimed at postural alignment and sitting positioning. In addition, patients in this group will receive transcutaneous diaphragmatic electrical stimulation (TDES) twice weekly for 30 minutes per session over a 6-week period.

Conventional exercises and electrical stimulation to the lower extremity muscles 5 days per week for 6 weeks, in addition to twice-weekly sessions of robotic rehabilitation, occupational therapy, hydrotherapy, and pulmonary rehabilitation program.

Using ultrasound, the diaphragm thickness (mm) and the diaphragm thickening fraction (TF %) will be measured and evaluated. During the measurements, children will be positioned in the semi-Fowler's position (30-45°) or, in appropriate cases, in the supine position, and the measurements will be taken from the right hemidiaphragm. In the ultrasound examination, a high-frequency linear probe (8-10 MHz) will be advanced along the midclavicular line toward the midpoint of the anterior axillary line and positioned at the junction between the seventh and eighth costal cartilages. The thickness of the diaphragm, which appears hyperechoic on the outer surface and hypoechoic on the inner surface, will be measured at the end of inspiration and expiration. Children will not be asked to exert maximum effort during the measurement. The thickness of the diaphragm muscle will be measured at the end of expiration (Texp) and the end of inspiration (Tinsp).

TF (%) = (Tinsp - Texp) / Texp × 100

the A and B subdomains of the Gross Motor Function Measure-88 (GMFM-88). The Gross Motor Function Measure-88 (GMFM-88) Subscale A scores between 0 and 51, while Subscale B scores between 0 and 60; higher scores indicate better gross motor function.