Recovering hand function after a stroke is often difficult. Many people struggle to use their weaker hand for daily tasks. This trial tested a new way to help. Researchers combined watching others perform actions with virtual reality training. They compared this to just using virtual reality alone. The study involved 48 adults who had strokes and lived in rehabilitation centers in Italy. They practiced goal-directed actions before trying them in a virtual environment. The control group watched nature scenes before doing the same tasks. The main goal was to see if the extra observation step helped the weaker hand improve more. Results showed the group that watched actions gained more function in their paretic hand. They improved by an average of 7.8 blocks at treatment end and 10.8 blocks at six months. The other hand improved similarly in both groups. Secondary measures like muscle strength and spasticity also showed similar gains across both groups. No safety issues were reported during the study. However, the researchers noted that age and time since stroke mattered. Treatment effects varied based on these factors. This means the best results depend on individual patient characteristics. The trial design supports the idea that the extra observation step helps motor recovery. This approach appears more effective for fine motor skills in the weaker hand.
Action observation combined with virtual reality improves paretic hand function in poststroke adults with hemiplegiaAction observation plus virtual reality boosts hand recovery after stroke
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Key Takeaway
Consider action observation combined with virtual reality for enhancing fine motor function of the paretic hand after stroke.
This randomized controlled trial enrolled poststroke adults with hemiplegia in inpatient rehabilitation centers in Italy. The study sample size was n=48. Participants were randomized to receive either action observation combined with virtual reality or virtual reality alone. The intervention involved observing goal-directed daily actions before replicating them in virtual reality. The comparator involved viewing nature scenes before performing the same virtual reality tasks without action observation. Follow-up evaluations occurred at baseline, postintervention, and at 6-month follow-up.
The primary outcome measured between-group differences in change in paretic hand scores using the Box and Block Test. The experimental group demonstrated a greater gain in paretic hand function compared to the control group. The effect size was 7.8 blocks at posttreatment and 10.8 blocks at 6-month follow-up. The 95% CI for the effect size was 7.1-7.9 at posttreatment and 10.6-10.9 at 6-month follow-up. Improvements in nonparetic hand function were comparable between groups. Secondary outcome measures including muscle strength, spasticity, global disability, functional independence, and nonparetic hand function showed similar improvements across both groups.
Safety and tolerability data were not reported. No adverse events, serious adverse events, discontinuations, or tolerability issues were documented in the provided data. A significant treatment by age by time-from-stroke interaction was observed for paretic hand dexterity, indicating that treatment effects varied according to these covariates. This interaction suggests that generalizability is limited and that treatment effects depend on specific patient characteristics.
What this means for you:
Action observation plus virtual reality improves weaker hand function after stroke better than virtual reality alone. More on Stroke
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View Original Abstract ↓
BACKGROUND: Action observation treatment and virtual reality are established approaches for upper limb rehabilitation after stroke. This study investigated whether combining action observation with virtual reality improves hand dexterity and upper limb motor recovery compared with virtual reality alone.
METHODS: In this multicenter, assessor-blinded randomized controlled trial conducted in inpatient rehabilitation centers in Italy between January 2022 and September 2024, poststroke adults with hemiplegia (n=48) were assigned to the experimental or to the control group. Both underwent 20 one-hour sessions over 5 weeks. Participants of the experimental group observed goal-directed daily actions before replicating them in virtual reality, whereas participants of the control group viewed nature scenes before performing the same virtual reality tasks without action observation. Motor function was evaluated at baseline, postintervention, and 6-month follow-up using the Box and Block Test, with the primary estimand defined as the between-group difference in change in paretic hand scores. Secondary outcomes included measures of muscle strength, spasticity, global disability, and functional independence.
RESULTS: Both groups showed improvement in Box and Block scores for both hands. However, the experimental group demonstrated a greater gain in paretic hand function, with a between-group difference in change of 7.8 blocks at posttreatment (95% CI, 7.1-7.9) and 10.8 blocks at 6-month follow-up (95% CI, 10.6-10.9). Improvements in the nonparetic hand were comparable between groups. Similar improvements across both groups were observed in secondary outcome measures. A significant treatment×age×time-from-stroke interaction was observed for paretic hand dexterity, indicating that treatment effects varied according to these covariates.
CONCLUSIONS: Action observation combined with virtual reality appears to be more effective than virtual reality alone for promoting upper limb motor recovery after stroke, particularly in enhancing fine motor function of the paretic hand.
REGISTRATION: URL: https://www.clinicaltrials.gov; Unique identifier: NCT05163210.
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