Counting Grasping Action Using Force Myography: An Exploratory Study With Healthy Individuals.
Zhen Gang Xiao, Carlo Menon
PMID 28582263WHAT IT FOUND
In 10 healthy people, wrist and forearm force-sensing straps told whether the hand was grasping or not with high accuracy, and counted grasps during controlled pick-and-place tasks.
It was not tested in stroke or weak-arm rehabilitation.
Key findings
01Wrist force-sensing straps identified grasping versus no grasping with a median testing accuracy of 95%, and forearm straps reached 91%.
02For the grasping state specifically, wrist straps were more accurate than forearm straps, with median testing accuracies of 95% and 85%.
03Counting the 120 expected test grasps gave median errors of 1% for wrist straps and 2% for forearm straps, with no significant difference between them.
STILL TO COME
How it was doneWhat they foundWhat it means for OTs
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What it does not show
The study included only 10 healthy volunteers, so it does not show how the straps work in people with stroke, a weak arm, or limited range of motion. The task was a controlled tabletop pick-and-place sequence, not real activities of daily living, so it does not show whether the technology can monitor everyday use. The outcome was detection and counting accuracy, not patient recovery, function, or clinical benefit. The straps were prototypes and required assistant placement and calibration, so they were not tested as a practical home device for patients. The authors declared a commercial interest in the technology, which may affect how the study was framed.
Declared interests
The principal investigator and members of his research team declared a vested interest in commercialising the technology if it is proven successful. The supplied text does not state who funded the study.
The easy way to misread this
Do not conclude that force-sensing straps are ready for stroke rehabilitation or will improve patient outcomes. The study tested only 10 healthy people in a controlled pick-and-place task, and the authors said further studies are needed before use in weak-arm populations.