Kinematic data were collected to characterize subjects' behaviors. Kinematic data were collected at 100 Hz with a passive motion analysis system (Vicon Motion Systems, Oxford UK). Gaps in raw kinematic data due to marker occlusions were filled with a quintic spline interpolation (Woltring; Vicon Nexus Software, Oxford Uk). Subjects' movements were assessed through passive reflective markers placed bilaterally on bony landmarks at the ankle (i.e., lateral malleolus) and the hip (i.e., greater trochanter). Markers were also placed asymmetrically on shanks and thighs to differentiate between the legs. Heel strikes, defined as the times when the feet landed on the ground, were identified with kinematic data. This was done to have equivalent event detection on the treadmill and overground as in previous transfer studies (Torres-Oviedo and Bastian, 2010 (link), 2012 (link)).
Passive motion analysis system
Manufactured by Vicon Motion Systems
Sourced in United Kingdom
The Passive motion analysis system is a lab equipment product offered by Vicon Motion Systems. It is a motion capture system that uses passive markers to track and record the movement of subjects or objects in a controlled environment. The system's core function is to provide accurate, real-time data on the kinematics and dynamics of the captured movements.
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Lab products found in correlation
3 protocols using passive motion analysis system
1
Kinematic Analysis of Gait Behavior
2
Ankle Biomechanics during Gait
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Ankle locations were collected by tracking reflective markers attached to the lateral malleoli with a passive motion analysis system sampling at 100 Hz (Vicon Motion Systems, Oxford, UK). Vertical ground reaction forces measured by the instrumented treadmill at 1000 Hz (Bertec Corporation, Columbus, OH) were used to detect heel strike (Fz > 10 N) and toe-off (Fz < 10 N). These data were collected for the biofeedback system.
3
Kinematic and Kinetic Analysis of Gait
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Kinematic data were collected to characterize subjects’ behavior. This data was collected at 100 Hz with a passive motion analysis system (Vicon Motion Systems, Oxford, U.K.). Subjects’ movements were assessed through passive reflective markers placed bilaterally on bony landmarks at the ankle (i.e., lateral malleolus) and the hip (i.e., greater trochanter); additional markers were placed asymmetrically on shanks and thighs to differentiate between the legs. Post-processing event detection like heel strike (i.e., foot landing) and toe-off (i.e., foot lifting) was identified with kinematic data [3 (link)], [4 (link)], [12 (link)], [18 (link)]. To ensure that participants take the same number of strides on the treadmill, we used a threshold of 30 Newtons to track participants’ heel strikes and toe-off in real-time. Kinetic data were recorded at 1000 Hz with an instrumented split-belt treadmill (Bertec, Columbus, OH).
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