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Whole body coordination and knee movement control during five rehabilitation exercises

Van Deursen, Robert William Martin, Button, Kate and Roos, Paulien E 2017. Whole body coordination and knee movement control during five rehabilitation exercises. Journal of Motor Behavior 10.1080/00222895.2016.1250718
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Knee rehabilitation exercises to improve motor control, target movement fluency and displacement variability. Although knee movement in the frontal plane during exercise is routinely assessed in clinical practice, optimal knee control remains poorly understood. In this study, twenty-nine healthy participants (height: 1.73±0.11 m, mass: 73.5±16.4 kg, age: 28.0±6.9 years) performed four repetitions of five rehabilitation exercises whilst motion data were collected using the VICON PlugInGait full body marker set. Fluency and displacement variability were calculated for multiple landmarks, including Centre of Mass (CoM) and knee joint centres. Fluency was calculated as the inverse of the average number of times a landmark velocity in the frontal plane crossed zero. Variability was defined as the standard deviation of the frontal plane movement trajectories. CoM fluency and displacement variability were significantly different between tasks (p<0.001). CoM displacement variability was consistently smallest compared to the constituent landmarks (p<0.005). This was interpreted as a whole body strategy of compensatory variability constraining CoM frontal plane movement. Ipsilateral knee fluency (p<0.01) and displacement variability (p<0.001) differed substantially between tasks. The role of the weight-bearing knee seemed dependent on task constraints of the overall movement and balance, as well as constraints specific for knee joint stability.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Healthcare Sciences
Subjects: R Medicine > R Medicine (General)
Uncontrolled Keywords: center of mass, human, interlimb coordination, interlimb coordination, stability
Publisher: Taylor & Francis
ISSN: 0022-2895
Last Modified: 18 Feb 2017 07:10

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