Instant of chair-rise lift-off can be predicted by foot-floor reaction forces [An article from: Human Movement Science]
![Instant of chair-rise lift-off can be predicted by foot-floor reaction forces [An article from: Human Movement Science]](http://liftingchair.info/images/p/51A0N8EWN3L._SL160_.jpg)
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This digital document is a journal article from Human Movement Science, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Objective: To develop a predictive model of the lift-off event during chair rise in healthy subjects, using foot-floor reaction forces. Background: An important event during chair rise is lift-off from the seat: the transition from the inherently stable three-point contact to the unstable two-point contact. There is no consistent or generally agreed upon method for estimating the time of lift-off when an instrumented seat is unavailable. Methods: Twenty healthy volunteers were divided into a testing set and training set. Each subject performed repeated chair rise trials at different speeds. Seat-floor and foot-floor forces, recorded with two force platforms, were used to develop a model of the lift-off event. Results: The magnitude of the vertical foot-floor reaction at lift-off (F0VF) was linearly related (R^2=0.71, P<0.001) to the peak vertical foot-floor reaction force (FMVF). A linear model was developed for the training group, which enabled prediction of lift-off time for the testing group with an absolute average error of 6 ms (about 1 data frame at 150 Hz). The linear model derived for the entire sample was: F0VF=28.14+FMVF*(0.6434). Conclusions: The lift-off event for healthy subjects performing chair rise can be accurately predicted from foot-floor reaction forces, without requiring an instrumented seat.
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Instant of chair-rise lift-off can be predicted by foot-floor reaction forces [An article from: Human Movement Science]
This digital document is a journal article from Human Movement Science, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Objective: To develop a predictive model of the lift-off event during chair rise in healthy subjects, using foot-floor reaction forces. Background: An important event during chair rise is lift-off from the seat: the transition from the inherently stable three-point contact to the unstable two-point contact. There is no consistent or generally agreed upon method for estimating the time of lift-off when an instrumented seat is unavailable. Methods: Twenty healthy volunteers were divided into a testing set and training set. Each subject performed repeated chair rise trials at different speeds. Seat-floor and foot-floor forces, recorded with two force platforms, were used to develop a model of the lift-off event. Results: The magnitude of the vertical foot-floor reaction at lift-off (F0VF) was linearly related (R^2=0.71, P<0.001) to the peak vertical foot-floor reaction force (FMVF). A linear model was developed for the training group, which enabled prediction of lift-off time for the testing group with an absolute average error of 6 ms (about 1 data frame at 150 Hz). The linear model derived for the entire sample was: F0VF=28.14+FMVF*(0.6434). Conclusions: The lift-off event for healthy subjects performing chair rise can be accurately predicted from foot-floor reaction forces, without requiring an instrumented seat.
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Tagged with: article • chairrise • footfloor • forces • from • human • instant • liftoff • movement • predicted • reaction • science
Filed under: Wheel chair stair lift
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