The aim of this study was to evaluate whether upper and lower extremity muscle strength is a factor in activity, participation and quality of life parameters in school-age children with CP and to reveal the difference in upper and lower extremity muscle strength compared to typically developing peers.

Upper motor neuron lesion causing Cerebral Palsy (CP) leads to various problems including muscle tone, coactivation of agonist-antagonist muscles, coordination, balance, muscle strength, loss of selective motor control, bone deformities and muscle contractures by negatively affecting motor control and these problems have been shown to affect the level of activity and participation in social life.

Studies demonstrate that increased muscle strength, especially with muscle strengthening programmes, improves functional outcomes in children with CP. Although studies exist on causal relationships between motor affectivity, GMFCS level, muscle strength and quality of life in children with CP, studies directly examining the relationship between muscle strength and activity level, participation in social life and quality of life are limited. Determining the relationship between lower and upper extremity muscle strength and participation and quality of life in children with CP is important for rehabilitation approaches. This will help focus on strengthening specific muscle groups in rehabilitation to increase participation in social life and quality of life in children with CP.

Inclusion Criteria:

• Having been diagnosed with cerebral palsy,
• Being classified as Level I-II-III on the Gross Motor Classification System,
• Being classified as Level I-II on the Communication Function Classification System (IFSS) for Individuals with Cerebral Palsy,
• Having turned 6 years old by the start of the study and not having turned 12 years old by the end of the study.

Inclusion criteria for typically developing children:

• Not having been diagnosed with any neurological disorder,
• Having turned 6 years old by the start of the study and not having turned 12 years old by the end of the study.

Exclusion Criteria:

• Have a Gross Motor Classification System Level IV-V,
• Have a Communication Function Classification System (IFSS) Level III, IV, and V for individuals with cerebral palsy,
• Having undergone Botulinum Toxin-A (BTX-A) injection in the last 6 months,
• Having undergone orthopaedic surgery in the last 6 months,
• Using medication that may affect muscle strength,
• Having cardiovascular problems.

Children with cerebral palsy who applied to the Paediatric Physiotherapy and Cerebral Palsy Unit of the Department of Physiotherapy and Rehabilitation, Faculty of Physical Therapy and Rehabilitation, Hacettepe University, and children of the same age group with typical development were included in the study.