Efficacy of a rehabilitation treatment using action Observation Therapy Enhanced by muscLe synergy-derived eLectrical stimulation (OTHELLO) in post-stroke patients: a RCT study protocol

Background: Action Observation Therapy (AOT) and Neuromuscular Electrical Stimulation (NMES) are widely adopted techniques for upper-limb rehabilitation in post-stroke patients. Although AOT and NMES are individually effective, studies investigating a potential synergistic effect on enhancing rehabilitative outcomes are lacking. Objectives: This study aims at comparing the effect of AOT and NMES applied together (AOT-NMES) on muscle synergies with respect to either AOT alone or a Motor Neutral Observation treatment alone (MNO, involving neither AOT nor NMES) on motor function recovery of upper limb. Design: Randomized Controlled Trial (RCT) with n = 60 post-stroke patients with resulting upper limb disability, randomly allocated (1:1:1 ratio) in three interventional arms: AOT-NMES (n = 20), AOT (n = 20) and MNO (n = 20). Methods and Analyses: All rehabilitation treatments will consist of n°15 60 min-long rehabilitative sessions. Primary outcome measure will be upper limb motor function, assessed using the Fugl-Meyer Assessment scale for upper limb (FM-UL), collected at the baseline (T0), post-intervention (T1) and at follow-up (T2, 6-months after T1). Other outcome measures will be collected through a multidimensional evaluation including assessing stroke-associated quality of life, neurophysiological data, biomechanical and MRI measures. The innovative protocol will also be evaluated for usability and safety. Discussion: We expect to determine the efficacy, usability and safety of the AOT-NMES rehabilitation approach for the recovery of upper limb motor function in post-stroke patients. The obtained results will also help reveal the neural underpinnings of motor recovery, as assessed by neurophysiological data, biomechanical and MRI measures.