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Maintenance of Human Vertical Posture upon Asymmetric Leg Loading and Fixation of the Knee Joint of One Leg

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Abstract

Maintenance of a vertical posture was studied in standing subjects with a fixed knee joint of one leg and a different weight distribution between the legs. Knee fixation on one leg did not affect the speed of movements of the common center of pressure (CP) at any weight distribution between the legs, and the stability of vertical posture was therefore unchanged. However, the relative contributions of the legs to the posture control changed when knee movements of one leg were restricted. The speed of CP movements of the free leg was independent of the weight loading on the leg. The speed of CP movements of the leg with the knee fixed depended on the weight distribution and was higher when the leg was loaded. Thus, the leg with the fixed knee joint made a greater contribution to maintaining vertical posture when the leg was loaded. Yet its contribution was comparable with that of the unloaded free contralateral leg even in this case, as was evident from lack of differences in CP movements between the two legs. It was assumed that the leg with the free knee joint played a major role in maintaining equilibrium of vertical posture, while the leg with the fixed knee joint mostly acted to more finely adjust the body position.

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Authors and Affiliations

  1. Kharkevich Institute of Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia

    O. V. Kazennikov, T. B. Kireeva & V. Yu. Shlykov

Authors
  1. O. V. Kazennikov
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  2. T. B. Kireeva
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  3. V. Yu. Shlykov
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Correspondence to O. V. Kazennikov.

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Original Russian Text © O.V. Kazennikov, T.B. Kireeva, V.Yu. Shlykov, 2018, published in Fiziologiya Cheloveka, 2018, Vol. 44, No. 1, pp. 49–55.

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Kazennikov, O.V., Kireeva, T.B. & Shlykov, V.Y. Maintenance of Human Vertical Posture upon Asymmetric Leg Loading and Fixation of the Knee Joint of One Leg. Hum Physiol 44, 41–46 (2018). https://doi.org/10.1134/S0362119718010097

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  • DOI: https://doi.org/10.1134/S0362119718010097

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