Is it Possible to Improve Static and Dynamic Postural Stability in Cerebral Palsy Children by Modulating Attention?
Is it Possible to Improve Static and Dynamic Postural Stability in Cerebral Palsy Children by Modulating Attention?
Cerebral palsy (CP) concerns 2 children out of 1000 in the general population (SCPE 2002). It is the main cause of postural and motor deficits in children.
During the past 20 years, the postural deficits exhibited by these children have been attributed to various factors :
The common point of all these studies is the existence of immature motor patterns, probably related to an inability to implement more elaborated and adapted motor patterns with respect the task to perform.
CP children do not develop the characteristics of the plant grad locomotion. They exhibit a uniform muscular activation with a high level of co-activation. Locomotion is generally characterized by an increase of stretching reflexes at short latencies and by a low level of activation associated to a low modulation of gastrocnemius muscles..
These data also suggest that it is the control of the temporal rather than the spatial parameters of the head which are mainly altered in CP children.
Even though static postural control and locomotion are considered as automatic processes, this control requires, however, a significant amount of attentional resources.
Within this context, the amount of attentional resources which need to be solicited can provide information on two complementary dimensions. On one hand, on the level of automaticity of postural control and/or locomotion when subjects' attention is oriented toward another task. On the other hand, on the cognitive cost of postural control and/or locomotion, depending on children age, that is, as a function of their level of maturation and of the nature and importance of their sensory-motor deficits. When the amount of required attentional resources is reduced, postural control and/or locomotion is considered as automatic processes with a low cognitive cost.
The dual task paradigm in which subjects have to simultaneously process a cognitive (e.g. Stroop task) and a postural or motor task (e.g., standing upright on a force platform) is generally used to investigate these questions.
How an appropriate allocation of attention is performed as a function of the cognitive and postural/motor tasks is important in the developmental process of posture and locomotion. It seems to be even more crucial in CP children and more generally in pathology.
The main goal of the present project is to investigate the contribution of attentional processes in postural control and locomotion of CP children as compared to control healthy children.
Within this scientific and clinical context, we hypothesize:
On the same basis, we will also investigate the attentional cost of locomotion.
Exploratory study of dynamic equilibrium during locomotion in the same conditions.
Investigation of posture in the following conditions:
Considering the goals of this research project, no serious undesirable event is expected to occur. However, falls may occur accidentally while rising or descending from the force platform, during static posture, or during locomotion. Consequently, in addition to the experimenter, a physiotherapist or someone of the medical staff will be present during all experimental recordings.
The environment will be also organized to the secure the experimental room by excluding all potentials dangerous or non necessary objects. Whenever necessary, the potentials falls will be reported and declared to the health authorities.
Inclusion Criteria:
Exclusion Criteria: