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Walking-adaptability assessments with the Interactive Walkway: Between-systems agreement and sensitivity to task and subject variations
The ability to adapt walking to environmental circumstances is an important aspect of walking, yet
difficult to assess. The Interactive Walkway was developed to assess walking adaptability by augmenting
a multi-Kinect-v2 10-m walkway with gait-dependent visual context (stepping targets, obstacles) using
real-time processed markerless full-body kinematics. In this study we determined Interactive
Walkway’s usability for walking-adaptability assessments in terms of between-systems agreement
and sensitivity to task and subject variations. Under varying task constraints, 21 healthy subjects
performed obstacle-avoidance, sudden-stops-and-starts and goal-directed-stepping tasks. Various
continuous walking-adaptability outcome measures were concurrently determined with the Interactive
Walkway and a gold-standard motion-registration system: available response time, obstacle-avoidance
and sudden-stop margins, step length, stepping...
Show moreThe ability to adapt walking to environmental circumstances is an important aspect of walking, yet
difficult to assess. The Interactive Walkway was developed to assess walking adaptability by augmenting
a multi-Kinect-v2 10-m walkway with gait-dependent visual context (stepping targets, obstacles) using
real-time processed markerless full-body kinematics. In this study we determined Interactive
Walkway’s usability for walking-adaptability assessments in terms of between-systems agreement
and sensitivity to task and subject variations. Under varying task constraints, 21 healthy subjects
performed obstacle-avoidance, sudden-stops-and-starts and goal-directed-stepping tasks. Various
continuous walking-adaptability outcome measures were concurrently determined with the Interactive
Walkway and a gold-standard motion-registration system: available response time, obstacle-avoidance
and sudden-stop margins, step length, stepping accuracy and walking speed. The same holds for
dichotomous classifications of success and failure for obstacle-avoidance and sudden-stops tasks and
performed short-stride versus long-stride obstacle-avoidance strategies. Continuous walking-adapt-
ability outcome measures generally agreed well between systems (high intraclass correlation
coefficients for absolute agreement, low biases and narrow limits of agreement) and were highly
sensitive to task and subject variations. Success and failure ratings varied with available response times
and obstacle types and agreed between systems for 85–96% of the trials while obstacle-avoidance
strategies were always classified correctly. We conclude that Interactive Walkway walking-adaptability
outcome measures are reliable and sensitive to task and subject variations, even in high-functioning
subjects. We therefore deem Interactive Walkway walking-adaptability assessments usable for
obtaining an objective and more task-specific examination of one’s ability to walk, which may be
feasible for both high-functioning and fragile populations since walking adaptability can be assessed at
various levels of difficulty.
Show less- All authors
- Geerse, D.J.; Coolen, B.H.; Roerdink, M.
- Date
- 2017
- Journal
- Gait and Posture
- Volume
- 54