Article

Performing a cognitive task while balancing can result in either increased or
decreased sway depending on the nature of the cognitive task, and is commonly
used in pathologic populations to evaluate postural performance.
A total of 39
participants were recruited into two groups: uninjured controls (n=20, age:
21.9+/-2.1 years, height: 175.0+/-11.2cm, mass: 71.3+/-14.9kg) and chronic ankle
instability (n=19, age: 22.1+/-5.6 years, height: 169.7+/-7.7cm, mass:
72.9+/-17.3kg). Participants were asked to perform one of three cognitive tasks
while maintaining single limb balance. Cognitive tasks included backwards
counting by 3 (BC), the manikin test (MAN), and random number generation (RNG).
Time-to-boundary minima, mean, and standard deviations were calculated and
compared between groups as pre to post change scores. Effect sizes and 95%
confidence intervals were also calculated to test for group differences and the
effect of task performance on sway. No significant main effects of Group or Group
by Task interactions were identified (p>0.05). However, a significant
multivariate main effect of Task was identified in BC (p=0.001, F(6, 32)=4.804)
and RNG (p<0.001, F(6, 32)=6.233) but not for MAN (p=0.117). The results suggest
that those with chronic ankle instability and uninjured controls have similar
postural-suprapostural interactions across multiple cognitive task domains. Both
the BC and RNG tasks resulted in less sway for all participants. Our results
suggest that dual-task interference in the CAI population may not be present as
previous research would suggest.
CI - Copyright (c) 2016 Elsevier B.V. All rights reserved.

Langue : ANGLAIS