1. Precueing time but not direction of postural perturbation induces early muscular activation: comparison between young and elderly individuals.
- Author
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Silva MB, Coelho DB, de Lima-Pardini AC, Martinelli AR, Baptista Tda S, Ramos RT, and Teixeira LA
- Subjects
- Adult, Age Factors, Aged, Aged, 80 and over, Attention, Cues, Electromyography, Humans, Middle Aged, Random Allocation, Reaction Time, Rotation, Time Factors, Muscle, Skeletal physiology, Postural Balance, Posture
- Abstract
In this study, we evaluated the effect of precueing characteristics of an impending perturbation to upright stance on reactive responses of distal leg muscles. Young and older individuals were compared in a task of recovering stable upright stance following rotation of the supporting platform to induce anterior or posterior body sway. Directions of the supporting platform rotation were randomized across trials. Immediately before postural perturbation participants were cued about direction and/or time of platform rotation, or performed the task under directional and temporal uncertainty of the impending perturbation. Results showed that precueing time of perturbation led to earlier muscular activation onset, while precueing perturbation direction did not modulate either latency or magnitude of muscular activation. Those effects were similar between age groups. Our findings suggest that awareness of the perturbation time favored shorter response latencies in both the young and older individuals., (Copyright © 2015 Elsevier Ireland Ltd. All rights reserved.)
- Published
- 2015
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