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Changes in passive ankle stiffness and its effects on gait function in people with chronic stroke

Changes in passive ankle stiffness and its effects on gait function in people with chronic stroke. Anindo Roy, PhD; Larry W. Forrester, PhD; Richard F. Macko, MD; Hermano I. Krebs, PhD. Aim Investigate robot-assisted ankle training in people with chronic stroke:

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Changes in passive ankle stiffness and its effects on gait function in people with chronic stroke

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  1. Changes in passive ankle stiffness and its effects on gait function in people with chronic stroke Anindo Roy, PhD; Larry W. Forrester, PhD; Richard F. Macko, MD; Hermano I. Krebs, PhD

  2. Aim • Investigate robot-assisted ankle training in people with chronic stroke: • Effect on passive ankle stiffness (PAS). • Relationship to overground gait function. • Relevance • Mechanical impedance of ankle is known to influence key aspects of ankle function.

  3. Method • 8 seated participants with residual hemiparetic deficits engaged in visuomotor task over 6 wk: • Performed dorsiflexion (DF) or plantar flexion (PF) of paretic ankle. • Ankle robot (“anklebot”) assisted as needed. • PAS was measured in both: • Trained sagittal plane. • Untrained frontal plane.

  4. Results • PAS decreased in both DF and PF. • DF PAS: • Reverted into variability of age-matched controls. • PF PAS: • Changes correlated strongly with gains in paretic step length and stride length. • Baseline correlated with gains in paretic step length, stride length, and single-support stance duration. • Baseline eversion PAS: • Correlated with gains in cadence.

  5. Conclusion • Ankle robot-assisted, visually evoked, visually guided ankle training positively affects paretic ankle PAS. • Strongly influences key measures of gait function.

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