Cerebral palsy (CP) is characterized by permanent or variable sensory-motor function impairments resulting from developmental anomalies or damage to the brain. Spasticity, dystonia, postural disorders, and weakened movement patterns can hinder the development of the respiratory system in children with CP. As the severity of postural disorders increases in children with CP, inadequate or improper use of respiratory muscles and insufficient ventilation reduce the mobility of the thoracic cage. The aim of study is to investigate the effects of respiratory muscle training on respiratory parameters, trunk control, walking, and functional independence in children with CP.

In this prospective randomized controlled study, participants will be divided into two groups: the Inspiratory Muscle Training (IMT) group and the control group. The IMT group will receive IMT in addition to the traditional physical therapy program, while the control group will only receive the traditional physical therapy program. Respiratory muscle strength, respiratory functions, chest expansion, trunk control, walking speed and endurance, and functional independence will be assessed before and after the training.

Inclusion Criteria:

• Aged between 4 and 12 years
• Classified as levels 1, 2, and 3 according to the Gross Motor Function Classification System (GMFCS)
• Diagnosed with spastic diplegia and/or hemiplegic cerebral palsy
• Ability to cooperate during the exercises

Exclusion Criteria:

• Presence of acute or chronic respiratory diseases
• Presence of acute medical conditions
• History of active epilepsy
• Scoliosis with a Cobb angle greater than 30 degrees
• Presence of chest deformities
• Severe visual and hearing impairments

Participants will be blind to their group and outcomes assessor will be blind to groups.