Article

Recurrence quantification analysis (RQA), a nonlinear method of postural
analysis, was used to explore the effects of dual-tasking on postural performance
in people with nonspecific low back pain (LBP) compared with healthy
participants. Postural performance was quantified by RQA % recurrence, %
determinism, entropy and trend. People with nonspecific LBP (n=22) and unimpaired
individuals (n=22) randomly performed quiet standing tasks with three levels of
difficulty (rigid-surface eyes open, rigid-surface eyes closed and foam-surface
eyes closed). These tasks were performed in isolation or concurrently with an
easy or difficult cognitive task. Increasing postural difficulty was associated
with higher % determinism, higher entropy and lower trend in anteroposterior (AP)
and mediolateral (ML) directions in people with LBP and healthy participants. All
RQA variables in the ML direction decreased as cognitive conditions became more
difficult. Significant interactions between group and cognitive difficulty were
shown for % recurrence, % determinism and trend in the AP direction. While
healthy participants decreased % recurrence and trend by increasing the level of
cognitive difficulty, the LBP patients did not. This preliminary study suggests
that LBP may be one factor that modulates the posture-cognition interaction.
CI - Copyright 2009 Elsevier B.V. All rights reserved.

Langue : ANGLAIS