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Montceau-les-Mines, France

Hlavackova P.,French National Center for Scientific Research | Hlavackova P.,Palacky University | Franco C.,French National Center for Scientific Research | Franco C.,CNRS Complex Medical Engineering Laboratory | And 5 more authors.
PLoS ONE | Year: 2011

The present study was designed to assess the relative contribution of each leg to unperturbed bipedal posture in lower limb amputees. To achieve this goal, eight unilateral traumatic trans-femoral amputees (TFA) were asked to stand as still as possible on a plantar pressure data acquisition system with their eyes closed. Four dependent variables were computed to describe the subject's postural behavior: (1) body weight distribution, (2) amplitude, (3) velocity and (4) regularity of centre of foot pressure (CoP) trajectories under the amputated (A) leg and the non-amputated (NA) leg. Results showed a larger body weight distribution applied to the NA leg than to the A leg and a more regular CoP profiles (lower sample entropy values) with greater amplitude and velocity under the NA leg than under the A leg. Taken together, these findings suggest that the NA leg and the A leg do not equally contribute to the control of unperturbed bipedal posture in TFA. The observation that TFA do actively control unperturbed bipedal posture with their NA leg could be viewed as an adaptive process to the loss of the lower leg afferents and efferents because of the unilateral lower-limb amputation. From a methodological point of view, these results demonstrate the suitability of computing bilateral CoP trajectories regularity for the assessment of lateralized postural control under pathological conditions. © 2011 Hlavackova et al. Source

Chenu O.,CNRS Complex Medical Engineering Laboratory | Chenu O.,IDS SA | Payan Y.,CNRS Complex Medical Engineering Laboratory | Hlavackova P.,CNRS Complex Medical Engineering Laboratory | And 5 more authors.
Applied Bionics and Biomechanics | Year: 2012

This paper presents a study on the usage of different informative modalities as biofeedbacks of a perceptual supplementation device aiming at reducing overpressure at the buttock area. Visual, audio and lingual electrotactile modalities are analysed and compared with a non-biofeedback session. In conclusion, sensory modalities have a positive and equal effect, but they are not equally judged in terms of comfort and disturbance with some other activities. © 2012 - IOS Press and the authors. All rights reserved. Source

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