The known-groups validity of intensity-based physical activity measurement using an accelerometer in people with subacute stroke.
Natsuki Shimizu, Hiroyuki Hashidate, Tomohiro Ota and 1 others
PMID 29706696WHAT IT FOUND
In subacute stroke, an accelerometer estimated energy cost well during some movement tasks, but underestimated quiet lying, sitting and standing.
The device was adequate for active tasks. It was not adequate for still posture.
Key findings
01In people with subacute stroke, estimated METs for lying, sitting and standing were significantly lower than ACSM reference values, at 0.5, 0.8 and 1.1 METs.
02For sitting with reaching and standing with reaching tasks, estimated METs in people with subacute stroke did not differ significantly from ACSM reference values, at 1.6 and 1.7 METs.
03During walking, estimated METs were significantly lower in people with subacute stroke than in healthy controls, at 3.8 and 5.7 METs.
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What it does not show
Only 10 stroke participants were studied, and all could walk independently with or without aids, so the results may not apply to people with more severe walking problems. The healthy control group was younger than the stroke group, so the comparison was not only stroke versus no stroke. The study tested only lying, sitting, standing, sitting with reaching, standing with reaching and walking, not other daily activities. The accelerometer underestimated METs during motionless posture, so it is not suitable for measuring intensity during quiet posture.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not conclude that this accelerometer can accurately measure physical activity intensity in all stroke patients. It underestimated quiet posture, and it was tested only in people who could walk independently.