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  • Title: Gait termination in young and older adults: effects of stopping stimulus probability and stimulus delay.
    Author: Tirosh O, Sparrow WA.
    Journal: Gait Posture; 2004 Jun; 19(3):243-51. PubMed ID: 15125913.
    Abstract:
    Sixteen young (25 +/- 2.6 years) and 16 older individuals (69 +/- 4.4 years) walked normally then terminated walking rapidly. A visual stopping stimulus was presented 10 ms following ground contact (short delay) and in another condition, at 450 ms prior to toe-off (long delay). Stimulus probability was either high (80% of trials) or low (10%). The younger group stopped faster (463 vs. 574 ms) despite also walking faster (1.29 vs. 1.17 m s(-1)). Longer delay decreased one-step responses but older participants used significantly more (slower) two-step stopping, which increased stopping time and distance. The additional step may have been pre-planned to maintain medial-lateral stability.
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