TY  - JOUR
PY  - 2017//
TI  - Physiological arousal accompanying postural responses to external perturbations after stroke
JO  - Clinical neurophysiology
A1  - Pollock, C. L.
A1  - Carpenter, M. G.
A1  - Hunt, M. A.
A1  - Gallina, A.
A1  - Vieira, T. M.
A1  - Ivanova, T. D.
A1  - Garland, S. Jayne
SP  - 935
EP  - 944
VL  - 128
IS  - 6
N2  - OBJECTIVE: The purpose of this study was to examine simultaneously the level of physiological arousal and the postural response to external perturbations in people post-stroke compared to age-matched controls to build a more comprehensive understanding of the effect of stroke on postural control and balance self-efficacy. <br><br>METHODS: Participants stood with each foot on separate force platforms. Ten applications of loads of 2% body weight at the hips perturbed the participant anteriorly under two conditions: investigator-triggered or self-triggered (total 20). Electrodermal activity (EDA; measurement of physiological arousal), electromyography (EMG) of the ankle plantarflexor muscles and anterior-posterior center of pressure measurements were taken pre-perturbation (anticipatory) and post-perturbation (response) and compared between the initial (first two) and final (last two) perturbations. <br><br>RESULTS: Participants post-stroke demonstrated significantly higher levels of anticipatory EDA and anticipatory paretic plantarflexor EMG during both self- and investigator-triggered conditions compared to controls. Anticipatory EDA levels were higher in the final perturbations in participants post-stroke in both conditions, but not in controls. Habituation of the EDA responses post-perturbation was exhibited in the self-triggered perturbations in controls, but not in participants post-stroke. <br><br>CONCLUSIONS: Physiological arousal and postural control strategies of controls revealed habituation in response to self-triggered perturbations, whereas this was not seen in participants post-stroke. SIGNIFICANCE: Understanding the physiological arousal response to challenges to standing balance post-stroke furthers our understanding of postural control mechanisms post-stroke.<br><br>Copyright © 2017. Published by Elsevier B.V.<p />  <p>Language: en</p>
LA  - en
SN  - 1388-2457
UR  - http://dx.doi.org/10.1016/j.clinph.2017.03.008
ID  - ref1
ER  -