Use of the non-paretic arm reflects a habitual behaviour in chronic stroke.
Sebastian Sporn, E Bonyadi, R Fathana and 4 others
PMID 40533857WHAT IT FOUND
When chronic stroke patients had to choose an arm quickly, they used their non-paretic arm more often even when it earned fewer points.
This suggests not using the paretic arm may reflect a habit, not only motor capacity.
Key findings
01In paretic trials where the paretic arm gave more points, non-paretic arm use rose from about 2% of trials to about 22% of trials when time was limited.
02The time-pressure shift was not explained by handedness, because dominant arm use did not change between unlimited and limited conditions.
03Changes in paretic arm use were not related to upper-limb motor scores or trail-making cognitive scores.
STILL TO COME
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What it does not show
The study included only 30 chronic stroke patients, all from the Queen Square Upper Limb rehabilitation programme, so it may not apply to stroke survivors with different impairments or backgrounds. The finding comes from a short computerised reaching task, not from real daily activities. No rehabilitation intervention was tested, so the study does not show that habit-breaking treatment improves paretic arm use. People with neglect, hemianopia, severe aphasia, or pain that limited participation were excluded, so results may not apply to those groups. The task used only horizontal shoulder and elbow movements and simple symbols, so it may not capture more complex hand use.
Declared interests
Funding was provided by the Jon Moulton Charity Trust and Stroke Association UK. The supplied text does not report author competing interests.
The easy way to misread this
Do not conclude that a habit-breaking therapy will improve paretic arm use. The study measured arm choices in a timed computer task in 30 chronic stroke patients and did not test any rehabilitation intervention.