Comparison of wrist actimetry variables of paretic upper limb use in post stroke patients for ecological monitoring.
Gilles Dusfour, Denis Mottet, Makii Muthalib and 2 others
PMID 37106460WHAT IT FOUND
Wrist sensors worn at home for seven days showed that stroke patients with mild to moderate arm weakness made about 800 functional movements per day with their paretic arm versus 4,000 with the other.
A ratio of these movements tracked arm impairment better than simple activity counts did.
Key findings
01Stroke patients performed approximately 831 functional movements per day with their paretic limb compared to 4,040 with their non-paretic limb, a difference that was statistically significant.
02The ratio of functional movements between the two arms (FuncUseRatio30) correlated more strongly with clinical motor scores (r² = 0.35) than the jerk ratio (r² = 0.21), though less strongly than total use hours (r² = 0.53).
03Patients with mild deficits did not spontaneously increase their use of the paretic arm in daily life even as their motor impairment scores improved, suggesting a need for specific rehabilitation focused on actual usage rather than just capacity.
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 sample size was small (19 stroke patients), which limits the generalizability of the findings. The study only included patients with mild to moderate deficits (Fugl-Meyer score > 15). It provides no data for patients with severe impairment who cannot move their arm at all. The definition of a 'functional movement' relied on an arbitrary 30-degree angle threshold, which the authors note might not capture all relevant activities. The study was cross-sectional (a single 7-day snapshot), so it cannot show how these variables change over time during rehabilitation. There was no video ground truth to verify if the sensor-detected movements were actually functional tasks (like eating or dressing) or just random motion.
Declared interests
The study was funded by the Direction Générale de l’offre de Soins. The authors declared no other conflicts of interest.
The easy way to misread this
Do not assume that improving a patient's clinical motor score will automatically lead to increased use of the arm in daily life. The study found that patients with mild deficits often maintained low functional use despite having the physical capacity to move more, meaning capacity and usage are separate issues that may require different therapeutic approaches.