Impact of Task-Specific Electrical Stimulation on Upper Limb Functional Motor Skills in Children With Spastic Quadriplegia

Cerebral palsy is a non-progressive lesion of the brain occurring before 2 years of age resulting in disorders of posture and movement.( Ostensjo S, 2004)( Keles MN, 2018) . Although non-progressive, motor impairments develop as the child grows leading to activity and participation restriction. For children with CP, body function and structure impairments include changes in muscle tone and strength that affect the ability to control movement, specifically in regard to postural responses, selective control, regulation of activity, ability to learn unique movements, and inappropriate sequencing.(Ross SA, 2007)( Ostensjo S, 2004) . Lack of proper loading and maladaptive muscle pulls over time causes the skeletal system to adapt to positions of malalignment, malformation, and overall bone weakness (Beckung E, 2007) (Elbasan B, 2018) . These changes lead to delays in the natural progression of gross motor skills. As the child falls behind in motor function, they also fall behind in cognitive stimulation and development.( Akaya KU, 2018) . Understanding the anatomical and physiological implications that CP has on the developing child is necessary for physical therapists to treat this population, especially when utilizing electrical stimulation. Spastic quadriplegia Is a type of cerebral palsy that affects all four limbs and typically involves significant motor impairment. It results from brain damage that occurs before, during, or shortly after birth, affecting the areas of the brain responsible for movement and coordination. Electrical stimulation is a mode of physical therapy that can be utilized in the treatment of various nerve and muscle injuries, in addition to patients with acute and chronic pain. It involves an electrical pulse applied to a muscle or nerve that activates excitable tissue utilizing internal or external electrodes to build muscle strength, reduce pain, as well as create or support limb movement (Kerr C, 2007) .

Study Overview

• Status: Completed
• Conditions: Cerebral Palsy (CP); Upper Limb Function; Spastic Quadriplegia; Functional Motor Disorder
• Intervention / Treatment: Other: Designed Physical therapy program; Device: The Chattanooga Continuum™

Detailed Description

Cerebral palsy (CP) encompasses a clinically diverse group of permanent but non-progressive disorders of posture and movement caused by disturbances in the developing brain (Rosenbaum et al., 2007). Spastic quadriplegia, also known as spastic tetraplegia, is a major subtype of spastic CP, characterized by significant impairment in motor function involving all four limbs and the trunk. Unlike spastic hemiplegia, which affects one side of the body, or spastic diplegia, which predominantly involves the lower limbs, spastic quadriplegia is defined by the bilateral and symmetric involvement of upper and lower extremities-often with the upper limbs being as severely, or more severely, affected than the lower extremities (Beckung et al., 2007; Palisano et al., 2009). Spastic quadriplegia is considered the most severe form of CP. Epidemiological data indicate that this subtype accounts for approximately 20-30% of all children with CP, with some variability by region and study population (Beckung et al., 2007). The condition affects both males and females and is not limited to any particular ethnic or socioeconomic group. 2. Etiology and Pathophysiology The etiology of spastic quadriplegia is multifactorial, primarily involving prenatal, perinatal, or early postnatal injury to the developing brain. The most common causes include:

• Prenatal factors: Intrauterine infections, genetic abnormalities, placental insufficiency, and exposure to toxins.
• Perinatal factors: Birth asphyxia, prematurity, intracranial hemorrhage, and periventricular leukomalacia (PVL).
• Postnatal factors: Neonatal stroke, traumatic brain injury, severe infections (e.g., meningitis, encephalitis). Brain imaging in children with spastic quadriplegia frequently reveals extensive lesions, often affecting both cortical and subcortical structures, periventricular white matter, and the basal ganglia. Lesions are typically bilateral and may include multicystic encephalomalacia or severe PVL (Rosenbaum et al., 2007; Novak et al., 2013). The widespread nature of 24 the injury explains the symmetric involvement of all limbs and the profound motor deficits observed in this population. The pathophysiology underlying spasticity includes disruption of descending inhibitory pathways, particularly those modulating the stretch reflex, resulting in increased muscle tone, hyperreflexia, and reduced reciprocal inhibition (Damiano, 2006). 3. Clinical Features The hallmark of spastic quadriplegia is the presence of bilateral spasticity affecting both upper and lower limbs, with notable involvement of the trunk and orofacial muscles in many cases. Clinical manifestations include:
• Severe motor impairment: Marked spasticity, muscle weakness, and decreased selective voluntary motor control in all extremities (Beckung et al., 2007).
• Joint contractures and deformities: Chronic spasticity often leads to fixed contractures, particularly at the shoulders, elbows, wrists, hips, knees, and ankles.
• Postural instability: Poor trunk and head control, often resulting in scoliosis, pelvic obliquity, and difficulties with sitting balance.
• Abnormal movement patterns: Persistence of primitive reflexes, synergistic patterns, and lack of dissociated movements.
• Oromotor and bulbar involvement: Dysarthria, drooling, and feeding difficulties are common due to spasticity of facial and bulbar muscles.
• Associated impairments: Cognitive impairment, epilepsy, sensory deficits (visual and auditory), and behavioral problems occur at higher rates in this population (Palisano et al., 2009; Novak et al., 2013). 4.Upper Limb Function in Spastic Quadriplegia Impairment of upper limb function is a cardinal feature and a primary determinant of disability in spastic quadriplegia. Key features include:
• Spasticity and weakness: Typically most pronounced in the flexor muscles of the upper limbs (shoulder adductors, elbow flexors, wrist and finger flexors).
• Impaired selective motor control: Difficulty isolating joint movements leads to mass grasp and release patterns, limiting dexterity and functional hand use (DeMatteo et al., 1992).
• Contractures: Especially common at the elbows and wrists, further limiting range of motion and functional reach.
• Poor postural control: Inadequate trunk stability compromises the ability to use the arms for support or manipulation.
• Functional impact: Profound limitations in reaching, grasping, releasing, weight-bearing, and manipulating objects undermine the ability to perform self-care, use assistive devices, participate in play and education, and interact socially (Palisano et al., 2009). Task-Specific Electrical Stimulation (TASES) Task-specific electrical stimulation (TASES) represents a significant evolution in the application of neurostimulation in neurorehabilitation. Unlike traditional NMES or FES, which may be applied passively or in a cyclic fashion, TASES is explicitly synchronized with active, goal directed motor tasks to maximize the interplay between voluntary effort and afferent feedback (Gordon et al., 2013; Daly et al., 2006). This approach is rooted in the principles of motor learning and neuroplasticity, which posit that the repetition of meaningful, contextually relevant tasks fosters more robust and lasting changes in the central nervous system than passive exercise alone (Kleim & Jones, 2008; Nudo, 2006). Principles and Mechanisms The primary premise of TASES is that coupling electrical stimulation with volitional, task-driven movement enhances motor output by:
• Increasing sensory feedback during task execution, thereby strengthening sensorimotor integration
• Facilitating the recruitment of motor units that might otherwise be difficult to activate voluntarily, especially in paretic or spastic muscles
• Reinforcing the temporal and spatial patterns of muscle activation required for functional tasks 40 By delivering stimulation at key points during a task (for example, during the weight-bearing phase of a push-up or during wrist extension as the hand contacts a support surface), TASES can help children with severe motor impairments more effectively engage muscles critical for upper limb function (Gordon et al., 2013; Daly et al., 2006). Mechanisms Underlying Functional Improvements Understanding the mechanisms by which electrical stimulation, and specifically task-specific electrical stimulation (TASES), improves upper limb function in children with spastic quadriplegia is essential for optimizing therapy and advancing clinical practice. The effects of ES are multifaceted, involving changes at the muscular, neural, and behavioral levels.

• Study Type: Interventional
• Enrollment (Actual): 30
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Egypt
  • Egypt
    • Alexandria, Egypt, Egypt, 21515
      • Aalaa Ahmed Farrag

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Child
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Their age will be ranged from 4 to 7 years.
• Their grade of spasticity will be from 1+ to 2 according to Modified Ashworth scale
• They will be on Level III and IV according to Gross Motor Functional Classification System (GMFCS).
• Parents/legals representatives consenting to their child's participation
• Diagnosed with Spastic Quadriplegic cerebral palsy

Exclusion Criteria:

1. Previous neurological or orthopedic surgery in the upperextremities.
2. Fixed deformity in the joints of upper limb. 3- Severe hearing and visual defect.

4-Irregular attendance at assessments or therapy sessions

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Study group; Task-specific electrical stimulation, was delivered using the NMES (Neuromuscular Electrical Stimulation) mode on the Chattanooga ContinuumTM Portable two channel electrical stimulator. • This device is commonly used for muscle re-education, strengthening and functional rehabilitation. Every kid received three sessions per week for two months; each session lasted one hour, half an hour was for the designed physiotherapy program (as in the control group), and last 20 minutes was for the TASES application during the weight bearing exercises including push up exercise, prone on hands exercise, quadruped with weight shifting, in addition to transition activities as side sitting to quadruped exercise.	Other: Designed Physical therapy program; The program used a combination of open-and closed-chain exercises. Exercises for facilitating transitions as supine to sit with hand weight bearing , side lying to side sit , side sitting to quadruped, weight bearing exercises as prone on hands on wedge , quadruped with weight shifting and push up exercise for one hour.; Device: The Chattanooga Continuum™; The Chattanooga Continuum™ (fig.2) is a portable 2 channel stimulator used by therapists in clinics and patients at home to provide electrical stimulation treatments in pain management (TENS) and neuromuscular stimulation (NMES). By combining TENS with NMES, users can simultaneously help manage pain and enhance exercise,3 thereby shortcutting the traditional muscle recovery cycle. Factor in a choice of program options including customizable waveforms,and you have a highly versatile and user-friendly rehabilitation tool that can help deliver optimal therapeutic outcomes. The Continuum Kit includes a transportation pouch and hand switch.
Active Comparator: Control group; Every kid received three sessions per week for two months; each session lasted one hour of designed physiotherapy program which included upper limb weight bearing exercises	Other: Designed Physical therapy program; The program used a combination of open-and closed-chain exercises. Exercises for facilitating transitions as supine to sit with hand weight bearing , side lying to side sit , side sitting to quadruped, weight bearing exercises as prone on hands on wedge , quadruped with weight shifting and push up exercise for one hour.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Improved upper limb functional motor skills	The Quality of Upper Extremity Skills Test (QUEST) is used by assessment of the weight bearing domain	2 months after treatment

Collaborators and Investigators

• Sponsor: Kafrelsheikh University

Study record dates

Study Major Dates

• Study Start (Actual): May 1, 2025
• Primary Completion (Actual): March 1, 2026
• Study Completion (Actual): March 10, 2026

Study Registration Dates

• First Submitted: June 1, 2026
• First Submitted That Met QC Criteria: June 1, 2026
• First Posted (Actual): June 8, 2026

Study Record Updates

• Last Update Posted (Actual): June 8, 2026
• Last Update Submitted That Met QC Criteria: June 1, 2026
• Last Verified: June 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Neurologic Manifestations; Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Brain Damage, Chronic; Paralysis; Pathological Conditions, Signs and Symptoms; Signs and Symptoms; Cerebral Palsy; Quadriplegia
• Other Study ID Numbers: KFSIRB200-1060

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No