Transcranial direct current stimulation combined with an intensive training program for upper limb rehabilitation in children with unilateral cerebral palsy. A randomized controlled pilot study.
Cathodal tDCS plus intensive hand training offered no motor boost over training alone for kids with unilateral CP.
01Research in Context
What this study did
Merino-Andrés et al. (2025) asked: does a gentle zap to the brain help kids with cerebral palsy move their weaker hand better? They split the children with unilateral CP into two groups. Both groups got 30 hours of fun, intense hand games and tasks. One group also got cathodal tDCS—20 minutes of low-level current over the healthy motor area—before every session. The other group got sham tDCS—same wires, no current. Kids wore the cap for 10 straight weekdays.
Therapists measured hand skills, grip strength, and quality of life before, right after, and one month later. The study was double-blind, so no one knew who got real zaps.
What they found
Both groups improved on every test. Real tDCS did not add extra hand strength or speed. The only bonus: parents in the tDCS group rated their child’s quality of life a little higher right after camp, but the edge vanished one month later.
No serious side effects showed up. Kids tolerated the tingling well.
How this fits with other research
Chen et al. (2013) showed stronger leg muscles at baseline forecast bigger motor gains over the study period of therapy. Javier’s trial adds a new twist: even when you add brain stimulation, baseline strength still matters more than the zap.
Ferreira et al. (2014) used the Gait Profile Score to prove ankle surgery improves walking. Javier uses similar objective scores for the arm, keeping the field’s push for clear, numbers-based outcomes alive.
Cheong et al. (2013) warn we lack validated self-concept tools for kids with CP. Javier’s brief quality-of-life bump hints that feelings can shift even when motor scores stay flat—yet we still need better measures to track those feelings.
Why it matters
If you run intensive hand camps, keep doing them—tDCS is not a magic add-on. Spend your budget on extra repetitions, fun tasks, or parent training instead. Track quality of life with short parent scales, but don’t over-interpret tiny, short-lived gains. And always screen baseline strength; it remains the best cheap predictor we have.
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02At a glance
03Original abstract
BACKGROUND: Unilateral cerebral palsy (UCP) presents a greater functional alteration of the upper limb. Among the recommended interventions are certain therapeutic tools, such as transcranial direct current stimulation (tDCS) that could increase the therapeutic window and enhance the effect of interventions. AIMS: To determine the effectiveness of a 3-weeks intervention of cathodal tDCS applied over the motor cortex of the less affected hemisphere combined with a manual function intensive training program in the upper limbs on quality of movement and the spontaneous use of upper limb in children with UCP. Secondarily, quality of life and user´s experience was also assessed. METHODS AND PROCEDURES: A pilot randomized triple-blind clinical trial was conducted. 18 children with UCP between 4 and 8 years were recruited and randomly allocated to one of the two experimental groups: 1) Active group: cathodal tDCS + intensive motor training; 2) Control group: Sham tDCS + intensive motor training. Assessments were performed before and after the intervention, and at three months follow-up. OUTCOMES AND RESULTS: Outcome measures: Shriners Hospital Upper Extremity Evaluation children's manual experience questionnaire, Paediatric Quality of Life Questionnaire and the Children's Manual Experience Questionnaire (miniCHEQ). Both groups improved in all variables but in the inter-group analysis only quality of life obtained significant results (p = 0.043). CONCLUSIONS AND IMPLICATIONS: Adding cathodal tDCS to a program of intensive manual function therapy training did not produce a greater improvement on the spontaneous use, nor improving the experience of use in children with UCP. However, this technique has a short-term beneficial effect on quality of life.
Research in developmental disabilities, 2025 · doi:10.1016/j.ridd.2025.105001