Changes in arm and hand function after four weeks robot-assisted arm training in stroke survivors

Area of Science:

• Rehabilitation Medicine
• Neuroscience
• Robotics in Healthcare

Background:

• Stroke survivors often experience impaired arm and hand function, impacting daily activities.
• Robot-assisted arm training (RAAT) is a therapeutic modality used to improve motor function after stroke.
• The relationship between training volume and functional outcomes in RAAT requires further investigation.

Purpose of the Study:

• To investigate the association between training volume during robot-assisted arm training (RAAT) and functional recovery in subacute stroke survivors.
• To assess changes in arm-hand function, grip strength, gross motor skills, spasticity, and daily activities following RAAT.
• To identify factors influencing RAAT outcomes, including time post-stroke, age, gender, and initial functional status.

Main Methods:

• Twenty subacute stroke participants (>18 years) with impaired arm function underwent 4 weeks of RAAT (45 min, 3-5 times/week).
• Assessments included arm-hand function, grip strength, gross motor dexterity, spasticity, and activities of daily living, conducted pre- and post-intervention.
• Statistical analyses explored correlations between training volume and functional changes, and subgroup analyses examined influencing factors.

Main Results:

• No significant association was found between RAAT training volume and improvements in arm-hand function, grip strength, gross motor dexterity, spasticity, or daily activities.
• No significant associations were observed between changes in arm-hand function and participant age, gender, or affected side.
• Subgroup analysis revealed significant improvements in arm-hand function for participants with shorter time post-stroke (p=0.01) and better initial arm-hand function (p<0.0001).

Conclusions:

• Training volume in RAAT does not appear to be a primary driver of functional improvement in subacute stroke survivors.
• Early initiation of RAAT and tailoring treatment based on a patient's initial functional status are crucial for optimizing outcomes.
• Individualized rehabilitation approaches are essential for maximizing the benefits of RAAT in stroke recovery.