Optic flow improves step width and length in older adults while performing dual task. Academic Article uri icon


  • 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.

published proceedings

  • Aging Clin Exp Res

altmetric score

  • 1.25

author list (cited authors)

  • Leeder, T., Fallahtafti, F., Schieber, M., Myers, S. A., Blaskewicz Boron, J., & Yentes, J. M.

citation count

  • 7

complete list of authors

  • Leeder, Taylor||Fallahtafti, Farahnaz||Schieber, Molly||Myers, Sara A||Blaskewicz Boron, Julie||Yentes, Jennifer M

publication date

  • August 2019