Characterization of stroke-related upper limb motor impairments across various upper limb activities by use of kinematic core set measures.
Anne Schwarz, Miguel M C Bhagubai, Saskia H G Nies and 4 others
PMID 35016694WHAT IT FOUND
Wearable movement analysis showed gesture and grasp tasks differ in stroke-related upper limb motion.
Moderate impairment made movements slower and less smooth across daily tasks. Task choice changes what movement measures mean.
Key findings
01Gesture and grasp tasks produced significantly different movement patterns across the core kinematic measures.
02Moderate upper limb impairment was associated with slower task performance (mean 6.4 seconds) and more velocity peaks (mean 53.0) than no impairment (4.2 seconds and 31.1) or mild impairment (5.2 seconds and 34.5).
03Within reaching subphases, trunk displacement and shoulder flexion/extension showed similar expressions across some tasks.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study was cross-sectional and did not test whether any treatment changed movement or patient outcomes. Only five healthy controls were included, so the reference group is small. Participants had to be able to lift the arm against gravity and flex and extend the fingers for basic grasp, so the results may not apply to people with more severe upper limb impairment. The wearable sensor system was not validated against an optical reference in this study, and prior sensor joint-angle estimates can have shoulder errors between 0.71° and 12.1° compared with optical systems around 1°. Automatic movement-phase detection was correct without manual correction in 85% of trials, but it failed more often in people with irregular and slow movement profiles. Three participants missed one of the 20 tasks.
Declared interests
The work was supported by Horizon 2020 and the P&K Pühringer Foundation. The supplied text does not state author conflicts of interest.
The easy way to misread this
Do not read this as evidence that a therapy using these measures improves upper limb function. It is an observational description of movement patterns in 31 people, and it did not test treatment effects.