Introduction
muscular acidosis, muscle weakness, weakness of the ankle plantar flexors, spasticity, fatigue, muscle spasm pain, spastic diplegia, disorder of posture or movement, disorder of the immature brain [, pain, muscle spasm, muscle fatigue
MUSCLE WEAKNESS, CLINICAL SYNDROME, SPASTIC DIPLEGIA, CEREBRAL PALSY, CEREBRAL PALSY (CP)
Cerebral palsy (CP) is a clinical syndrome characterized by a persistent disorder of posture or movement due to a nonprogressive disorder of the immature brain [Children with spastic diplegia typically walk slowly, and their gait patterns are characterized by excessive knee and hip flexion, implicating weakness of the ankle plantar flexors and knee and hip extensors. Due to muscle weakness and spasticity, the child needs higher force to perform the activities of daily living (ADL) and the exercises performed in a physiotherapy session. Consequently, when muscular power declines, relative strength increases, which can easily result in muscle fatigue. As a result, the child becomes exhausted from even the smallest effort and experiences pain while moving [The main problem that causes muscle fatigue is that lactic acid dissociates and thus is converted into lactate which causes the accumulation of H+ ions leading to muscular acidosis; the influence of the H+ ions promotes the state of exhaustion, interrupting the breakdown of glycogen and influencing the levels of ATP which makes the child to have lower muscle power compared to typically developing child and influences on his performance of daily living activities and exercises [Numerous studies have focused on ways of treatment that can be used to prevent or reduce muscle fatigue. They discovered that low-level laser is considered an important source that interacts with biological tissues, giving many physiological and therapeutical effects, including the enhancement of muscle performance [Also, low-level laser was very effective in suppressing tonic muscle spasm (spasticity) in patients with cerebral palsy. It greatly improves functional training, reduces blood lactate, increases the time preceding fatigue, and increases muscular torque generation [Many researches discussed the effect of low-level laser on muscle fatigue. They concluded that low-level laser therapy (LLLT) has a good effect on reducing muscle fatigue and post-exercise muscle recovery when therapy is applied before exercising [The aim of our study was to examine the effect low-level laser on muscle spasm pain, muscle power, muscle fatigue, and child’s performance.