n International SportMed Journal - Magnitude and duration of the effects of plantar sole massages on the upright stance control mechanisms of healthy individuals : original research article
|Article Title||Magnitude and duration of the effects of plantar sole massages on the upright stance control mechanisms of healthy individuals : original research article|
|© Publisher:||International Federation of Sports Medicine|
|Journal||International SportMed Journal|
|Author||Laurence Bernard-Demanze, Nicolas Vuillerme, Loetitia Berger and Patrice Rougier|
|Publication Date||Jan 2006|
|Pages||154 - 169|
|Keyword(s)||Centre of pressure, Fractional Brownian motion modelling, Frequency analysis, Plantar sole massages and Upright stance mechanisms|
<I>Background:</I> The purpose of the present study was to investigate (1) the effects of plantar sole massages on upright stance control mechanisms and (2) whether the magnitude of these effects were modified with increasing duration of plantar sole massage. <BR><I>Methods:</I> Twelve young healthy individuals stood barefoot on a force platform before and after three sessions of 10-minute massages applied under the feet. The centre of foot pressure (CP) displacements were used to estimate the vertically projected motions of the centre of gravity (CG<sub>v</sub>) and its difference from the CP (CP-CG<sub>v</sub>) along medio-lateral (ML) and antero-posterior (AP) axes. These motions were processed through a frequency analysis and modelled as fractional Brownian motion (fBm) in order to gain insight into the nature of the control mechanisms called into play and their spatio-temporal organisation. <BR><I>Results:</I> Decreased CP-CG<sub>v</sub> and CG<sub>v</sub> amplitudes along the ML axis were observed after each massage, indicating a better control of the body weight distribution over the two supports. The fBm modelling further showed some reduced spatial transition point coordinates and more deterministic corrective mechanisms along the two axes, hence explaining the reduced centre of gravity motions. <BR><I>Conclusions:</I> The present findings suggest that plantar sole massages yielded a reorganisation of the control mechanisms for maintaining undisturbed upright stance.
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