Effect of an additional manual motor task on the maintenance of equilibrium in the frontal and sagittal planes in standing subjects |
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Authors: | O V Kazennikov T B Kireeva |
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Institution: | (1) Department of Human Physiology, University of Pisa, Via San Zeno, 31, 56127 Pisa, Italy;(2) Department of Physiology, University of Siena, Siena, Italy;(3) Institute of Clinical Physiology, National Council of Research, Pisa, Italy |
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Abstract: | The postural oscillations of a standing subject during an additional manual motor task consisting in holding a movable ball
in the center of a flat box were studied. The movements of the center of pressure (CP) in the frontal and sagittal planes
were studied when subjects were standing on a stable rigid support and on a movable unstable support. The effect of the additional
motor task on the movement of the CP depended on the stability of the support. When the additional task was performed, the
sagittal movements of the CP increased in the case a movable support and did not increase when the support was stable. The
additional task decreased the frontal movements of CP in the case of a stable support, and it did not change the frontal movements
of CP when the support was unstable. Thus, the performance of an additional motor task led to a reduction of the efficiency
of the postural control system in maintaining equilibrium on an unstable support. This decrease may be due to a greater cortical
influence on the posture control system in subjects standing on a movable support in comparison with this influence in the
case of a stable support. |
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Keywords: | |
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