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

This study aimed to explore the relationship between training volume during 4 weeks of robot-assisted arm training (RAAT) and changes in arm-and hand function, grip strength, gross motor skills, spasticity, and daily activities. Twenty participants, >18 years of age, in subacute phase following stroke, with impaired arm function admitted to Sunnaas Rehabilitation Hospital, completed 4 weeks robot-assisted arm training (45 min, 3-5 times a week). Before and after this intervention, the participants' arm and hand function, grip strength, gross motor dexterity, spasticity and activities of daily living were assessed. The key findings of this study indicated no association between training volume and improvements in arm and hand function, grip strength, gross motor dexterity, spasticity, or activities of daily living. Also, no significant associations between changes in arm and hand function and age, gender, or affected side. However, subgroup analysis showed significant improvements in arm-hand function for participants with shorter time post-stroke (p = 0.01) and better initial arm and hand function (p < 0.0001). These findings highlight the importance of early initiation and individualized treatment based on initial function when using robot-assisted arm training in stroke survivors.