Kinematic parameters obtained with the ArmeoSpring for upper-limb assessment after stroke: a reliability and learning effect study for guiding parameter use.
Nabila Brihmat, Isabelle Loubinoux, Evelyne Castel-Lacanal and 2 others
PMID 32993695WHAT IT FOUND
Peak velocity and game score are reliable and stable for assessing upper-limb impairment.
Time-based measures improve with practice, so the first session and early trials must be excluded to avoid mistaking learning for recovery.
Key findings
01Peak velocity and game score showed no learning effect across trials or sessions, making them suitable for assessing performance at a specific time.
02Time-based parameters and movement smoothness measures improved significantly across trials and sessions, indicating a strong learning effect.
03To minimize the learning effect, the first session should be treated as familiarization, and assessment should rely on the last four trials of subsequent sessions.
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 a pilot with a small sample size of 30 patients. The assessment was limited to a 2D horizontal task, so results may not generalize to other movements or 3D tasks. The exoskeleton's weight support may have influenced kinematic data, although it was a passive device. Retention was only assessed over 24 hours, so longer-term effects are unknown. Transfer of learning to other tasks or real-world activities was not evaluated.
Declared interests
The authors declared no conflicts of interest. The study was conducted at the Toulouse University Hospital.
The easy way to misread this
Do not interpret improvements in time-based kinematic parameters as evidence of motor recovery. These measures showed a strong learning effect across trials and sessions, meaning early improvements reflect task familiarity rather than true neurological change.