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AIM OF THE STUDY To investigate the effect of the Inerventions method on gross motor function in children with spastic cerebral palsy (CP). CLINICAL RATIONALE FOR THE STUDY The Inerventions method is the type of transcutaneous electrical nerve stimulation (TENS) delivered through a full-body garment (Mollii suit) that aims to prompt reciprocal inhibition via the antagonist to reduce spasticity in selected muscle groups. Although Mollii is approved by the European Union as a medical device, independent clinical tests have not yet been performed. MATERIALS AND METHODS 16 children with spastic CP, aged 4.7 ± 1.3 were recruited and then willingly assigned to the Inerventions method (n = 8) and control groups (n = 8). In the Inerventions method group, TENS was applied 1 h per session, 3 days weekly for 3 weeks. Children of the control group received functional exercises program for the same duration, frequency and length. Outcome measures included the Gross Motor Function Measure, passive range of motion (PROM), the Modified Tardieu Scale, and the Timed Up and Go test. RESULTS While both groups experienced improvements in gross motor function and mobility, the difference in improvement between children treated with the TENS and physiotherapy did not reach statistical significance. No change occurred in PROM and spasticity in either group following the interventions. CONCLUSIONS There is no superior efficacy of the Inerventions method compared to conventional physiotherapy.