Following a stroke, the function of the distal upper limb, especially hand and finger movements, is often severely compromised, significantly restricting the ability to carry out daily activities. It is estimated that 55-75% of stroke survivors suffer from motor dysfunction, with upper limb impairments affecting up to 85% of them (Tang et al., 2024). Current rehabilitation approaches, while beneficial, often produce limited gains in hand function, particularly in patients with chronic stroke. Virtual reality (VR) training has emerged as a promising tool in neurorehabilitation, providing repetitive, task-specific, and engaging practice environments that can promote motor learning (Cameirão et al., 2012). tDCS has also shown potential to enhance motor recovery when combined with motor practice (Kang et al., 2016). To date, no studies have directly compared the effectiveness of Bi-tDCS with VR for improving upper limb function after stroke.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
100
20 minutes of tDCS during 45 minutes of VR games. bi-tDCS will be used during the sessions. The anodal tDCS (2 mA) will be applied for 20 minutes. Continuous, direct currents. The anodal electrode will be positioned over the ipsilesional primary motor cortex (M1) of the affected hemisphere and the cathodal electrode over the contralesional hemisphere.
45 minutes of VR games with sham tDCS. This provides the participants with the experience of the initial itchy sensation that occurs during tDCS, which is required for efficient masking.
King Fahad Medical City مدينه الملك فهد الطبيه, 6496 Makkah Al Mukarrama Road, الرياض, الرياض 12231
Riyadh, Saudi Arabia
RECRUITINGWolf Motor Function Test (WMFT)
The WMFT is a standardized assessment used to measure upper extremity motor ability through the performance of 17 tasks that include both functional and strength components. Rated using the 6-point scale ranging from 0 (no attempt) to 5 (normal movement). The total performance time and quality of movement are recorded, with lower scores indicating lower levels of functioning.
Time frame: at baseline and after intervention (4 weeks).
Fugl-Meyer Assessment Scale Upper Extremity (FMA-UE):
The FMA-UE is a comprehensive quantitative measure designed to evaluate motor function, coordination, and reflex activity of the affected upper limb following stroke. It uses a 3-point ordinal scale (0 = cannot perform, 1 = performs partially, 2 = performs fully), with a maximum score of 66 points for the upper extremity. It is considered the gold standard for assessment of upper limb motor recovery.
Time frame: at baseline and after intervention (4 weeks).
Box and Block Test (BBT):
The BBT is a validated measure of gross manual dexterity that evaluates how many 1-inch wooden blocks a participant can transfer from one compartment to another within 60 seconds using one hand. The apparatus consists of a wooden box divided into two equal sections containing 150 small cubes. The test begins with the unaffected upper limb to allow practice and establish a baseline performance. Participants are then instructed to move as many blocks as possible, one at a time, over the partition within the time limit. The score is defined as the total number of blocks successfully transferred within 60 seconds.
Time frame: at baseline and after intervention (4 weeks).
Cortical Excitability Assessment:
Corticospinal excitability will be evaluated using transcranial magnetic stimulation (TMS) to measure motor evoked potentials (MEPs) elicited by TMS in both the affected and unaffected motor cortices (Wassermann et al., 2008). Electromyographic (EMG) activity will be monitored in real-time during TMS application, with MEPs recorded bilaterally from the first dorsal interosseous (FDI)
Time frame: at baseline and after intervention (4 weeks).
Functional magnetic resonance imaging (fMRI):
Functional magnetic resonance imaging (fMRI), a specialized form of MRI, will be utilized to assess brain activity and neural connectivity. The fMRI protocol will employ a block design paradigm, with each scanning session lasting 6 minutes and divided into six blocks. Each block will consist of 15 repetitions of 2-second contractions, separated by 30-second rest intervals (Wen et al., 2014). During the task, participants will be instructed to squeeze a rubber ball with their affected hand at an intensity corresponding to 30% of their maximum voluntary contraction force (Cheng et al., 2021; Ismail et al., 2014). Visual cues will be displayed to assist participants in achieving the target force level (Könönen et al., 2012).
Time frame: at baseline and after intervention (4 weeks).
The Arabic version of the Stroke Specific Quality of Life Scale (SS-QOL):
The Stroke Specific Quality of Life Scale (SS-QOL) is a self-report questionnaire designed to assess quality of life. The 49 items on the SS-QOL measure are divided into 12 domains, which include family roles, language, mobility, mood, personality, self-care, social roles, thinking, upper extremity function, vision, energy, and work/productivity. Each of the 49 items is evaluated on a consistent five-point scale. Each item's responses are summed up, and the composite score that results varies from a minimum of 49 to a maximum of 245; higher scores indicate a better quality of life. The SS-QOL-49 has been translated into Arabic, and it has good validity and reliability for patients with stroke (Sallam et al., 2019).
Time frame: at baseline and after intervention (4 weeks).
Arabic Version of Stroke Impact Scale (SIS-16):
The Stroke Impact Scale (SIS) is a specific self-report measure used to assess health status in individuals after a stroke. It includes 16 items that assess different aspects of daily functioning: 7 items cover basic and instrumental activities of daily living, 8 items focus on mobility, and 1 item evaluates hand function. Each item is rated on a 5-point Likert scale, ranging from 1 (unable to complete) to 5 (no difficulty at all) (P. Duncan et al., 2003; P. W. Duncan et al., 2003). Higher scores reflect a better health-related quality of life among patients with stroke (P. W. Duncan et al., 2003). The SIS-16 is a valid and reliable tool for evaluating quality of life in patients with stroke (Chou et al., 2015).
Time frame: at baseline and after intervention (4 weeks).
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