Relation between postural control assessment with eyes open and centre of pressure visual feedback effects in healthy individuals

Abstract

Visual feedback (VFB) of the resultant centre of pressure (CP(Res)) is a potentially interesting technique for rehabilitation purposes. However, all past studies have not been unanimous in supporting its utility in a physical therapy program. The present study was therefore undertaken with the main aim of assessing whether insights from postural control without additional feedback could be gained to explain the possible VFB effects. The CP(Res) displacements of 65 healthy adults were analysed in two conditions (eyes-open and VFB) through various classical parameters (including surface and variances along each medio-lateral and antero-posterior axes) and fractional Brownian motion (fBm) modelling. The results indicate that 69% of the sample were dependent on VFB, i.e. that the surface covered by the CP(Res) displacements was smaller during VFB than in the eyes-open condition. The comparison of the two subgroups (i.e. those who were dependant on VFB and those who were not) brought out significant differences in many classical and fBm parameters. In addition, the correlation between the degree of VFB dependency and the values measured during the eyes-open condition indicates that the more the subjects are VFB-dependent, the less they lean forward, the smaller the variance and the better the CP(Res) displacements are controlled over the longest time intervals. By specifying the links between the postural performance in an eyes-open standard condition and the degree of VFB dependency, a number of clues help identify the reasons for which some subjects do not succeed in using this technique, hence explaining the controversy about its use as a rehabilitation tool.

Joint coordination in young and older adults during quiet stance: Effect of visual feedback of the center of pressure

“…The influence of COP visual feedback on postural control of young and older adults during stance posture has been described before [7][8][9][10]. Dault et al [8] observed that while young adults decreased the COP variability with COP visual feedback, older adults were not able to decrease it.…”

“…In young adults, the positive effect of COP visual feedback has also been debated. Boudrahem and Rougier [9] observed that only 69% of the adults investigated in their study presented smaller COP displacement during standing with COP visual feedback than in the eyes-open condition. Duarte and Zatsiorsky [10] found that the use of COP visual feedback to reduce postural sway during quiet standing by How aging affects body sway and joint coordination during quiet standing was investigated under two visual feedback conditions provided on a monitor screen: fixed and moving cursor representing the center of pressure (COP) position measured by a platform.…”

“…The use of real-time visual feedback of the center of pressure (COP) during a standing task is a common tool employed in evaluation and training of the postural control [7][8][9][10][11]. The influence of COP visual feedback on postural control of young and older adults during stance posture has been described before [7][8][9][10].…”

Differential impact of visual feedback on plantar- and dorsi-flexion maximal torque output

“…For example, underestimating maximal torque prior to a training program would likely culminate in D r a f t observations of higher strength gains in exercise interventions. Although the effect of visual feedback on enhancing an MVC is poorly reported, the positive effect of visual feedback on the acquisition of finite motor skills (Horeman et al 2012), postural control (Boudrahem and Rougier 2009) and reducing force fluctuations (Christou 2005) is well known. Thus, the benefit of visual feedback on the execution of MVC is unsurprising; however, its differential effect between agonist-antagonist pairs requires further study.…”

Boundary controllability of nonlocal Hilfer fractional stochastic differential systems with fractional Brownian motion and Poisson jumps

“…This property makes this process useful as driving noise in models appearing in finance markets, physics, telecommunication networks, hydrology and medicine etc. (see [2][3][4]). Stochastic differential equations driven by fractional Brownian motion have been considered extensively by research community in various aspects due to the salient features for real world problems (see [5][6][7][8][9][10][11][12]).…”