The Accuracy of the Detection of Body Postures and Movements Using a Physical Activity Monitor in People after a Stroke

Malou H J Fanchamps, Herwin L D Horemans, Gerard M Ribbers, Henk J Stam, Johannes B J Bussmann, Malou H J Fanchamps, Herwin L D Horemans, Gerard M Ribbers, Henk J Stam, Johannes B J Bussmann

Abstract

Background: In stroke rehabilitation not only are the levels of physical activity important, but body postures and movements performed during one’s daily-life are also important. This information is provided by a new one-sensor accelerometer that is commercially available, low-cost, and user-friendly. The present study examines the accuracy of this activity monitor (Activ8) in detecting several classes of body postures and movements in people after a stroke.

Methods: Twenty-five people after a stroke participated in an activity protocol with either basic activities or daily-life activities performed in a laboratory and/or at home. Participants wore an Activ8 on their less-affected thigh. The primary outcome was the difference in registered time for the merged class “upright position” (standing/walking/running) between the Activ8 and the video recording (the reference method). Secondary analyses focused on classes other than “upright position”.

Results: The Activ8 underestimated the merged class “upright position” by 3.8% (775 s). The secondary analyses showed an overestimation of “lying/sitting” (4.5% (569 s)) and of “cycling” (6.5% (206 s)). The differences were lowest for basic activities in the laboratory and highest for daily-life activities at home.

Conclusions: The Activ8 is sufficiently accurate in detecting different classes of body postures and movements of people after a stroke during basic activities and daily-life activities in a laboratory and/or at home.

Keywords: accelerometry; activity monitoring; body postures and movements; physical behavior; stroke; validation.

Conflict of interest statement

The authors declare no conflicts of interest

Figures

Figure 1
Figure 1
The Activ8 attached to the front of the less-affected thigh.
Figure 2
Figure 2
The Bland–Altman plots (x-axis: mean of Activ8 and video recording; y-axis: difference, calculated as Activ8 minus video recording) of the body postures and movements for all data together. The solid lines are the mean difference and the upper and lower limits of agreement. For “standing” and “walking/running”, only data from the basic activities (performed in the laboratory or at home) were used. Each dot is one assessment.
Figure 2
Figure 2
The Bland–Altman plots (x-axis: mean of Activ8 and video recording; y-axis: difference, calculated as Activ8 minus video recording) of the body postures and movements for all data together. The solid lines are the mean difference and the upper and lower limits of agreement. For “standing” and “walking/running”, only data from the basic activities (performed in the laboratory or at home) were used. Each dot is one assessment.

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Source: PubMed

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