Optic flow improves step width and length in older adults while performing dual task.
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ABSTRACT: BACKGROUND:Dual-task paradigms are used to investigate gait and cognitive declines in older adults (OA). Optic-flow is a virtual reality environment where the scene flows past the subject while walking on a treadmill, mimicking real-life locomotion. AIMS:To investigate cost of environment (no optic-flow v. optic-flow) while completing single- and dual-task walking and dual-task costs (DTC; single- v. dual-task) in optic-flow and no optic-flow environments. METHODS:Twenty OA and seven younger adults (YA) walked on a self-paced treadmill in 3-min segments per task and both environments. Five task conditions included: no task, semantic fluency (category), phonemic fluency (letters), word reading, and serial-subtraction. RESULTS:OAs had a benefit of optic-flow compared to no optic-flow for step width (p?=?0.015) and step length (p?=?0.045) during letters compared to the YA. During letters, OA experienced improvement in step width DTC; whereas YA had a decrement in step width DTC from no optic-flow to optic-flow (p?=?0.038). During serial-subtraction, OA had less step width DTC when compared to YA in both environments (p?=?0.02). DISCUSSION:During letters, step width and step length improved in OA while walking in optic-flow. Also, step width DTC differed between the two groups. Sensory information from optic-flow appears to benefit OA. Letters relies more on verbal ability and word knowledge, which are preserved in aging. However, YA use a complex speech style during dual tasking, searching for complex words and an increased speed of speech. CONCLUSIONS:OA can benefit from optic-flow by improving spatial gait parameters, specifically, step width, during dual-task walking.
SUBMITTER: Leeder T
PROVIDER: S-EPMC6486470 | biostudies-literature | 2019 Aug
REPOSITORIES: biostudies-literature
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