Using MediaPipe to track upper-limb reaching movements after stroke: a proof-of-principle study.
Vaidehi Wagh, Matthew W Scott, Justin W Andrushko and 4 others
PMID 41291901WHAT IT FOUND
In seven people after stroke, single-camera MediaPipe tracked reaching videos and showed faster palm movements by day five.
Palm movement consistency decreased, and shoulder/trunk patterns differed, so speed alone did not reveal whether movement was recovered or compensated.
Key findings
01Mean palm speed was significantly faster on Day 5 than on Day 1, while palm BVE had a significant main effect of Day and was greater on Day 5 than on Day 1.
02Palm speed increases were associated with decreased shoulder and trunk BVE for two participants and with increased shoulder and trunk BVE for five participants.
03In the group-level models, shoulder BVE significantly affected palm speed, and FMA-UE score significantly affected both palm speed and palm BVE.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The study had no control group, so it cannot show that the observed changes were caused by the reaching task rather than by time, practice, or other factors. Only seven participants were studied, and the sample was limited to people with mild motor impairment, so results may not apply to more severe stroke impairment. MediaPipe was tested only for two-dimensional trajectories from a single camera, while the task involved three-dimensional arm movement. This study did not compare MediaPipe output with a standard kinematic assessment system. Analyses used only the first and last blocks of the first and last sessions, not all blocks from all five sessions. The models included only seven participants, so the associations need confirmation in larger studies.
Declared interests
The article states that the Canadian Institutes of Health Research funded the study.
The easy way to misread this
Do not read faster palm speed as evidence that stroke movement quality recovered. The study had no control group, only seven participants with mild impairment, and palm movement consistency decreased while shoulder and trunk patterns varied.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →