Univerzitetni rehabilitacijski inštitut RS, Ljubljana (IRLJ)
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Functional postural responses after perturbations in multiple directions in a standing man : a principle of decoupled controlMatjačić, Zlatko ...The objective of this study was to assess Functional postural responses by analyzing the net joint torques (NJT) in the ankles and the hips resulting from perturbations delivered in multiple ... directions to subjects standing quietly. A total of eight subjects were standing on two force platforms while an apparatus randomly delivered controlled perturbations at the level of the pelvis in eight directions: anterio-posterior (AP), medio-lateral (ML), and four combinations of these principal directions. Perturbations were repeated five times in each direction for six conditions (i.e., three different perturbation strengths and three different feet orientations). The comparison of the averaged ankle sum NJT (AP) responses showed that the time courses of the responses elicited by a perturbation acting only in the AP direction were identical to those elicited by a combination of two corresponding AP and ML perturbations. In contrast the observed averaged ankleNJT (ML) responses did not follow the same similarity. The comparison of the averaged ankle and hip sum NJT (ML) responses revealed that the time courses of the responses elicited by a perturbation acting only in the ML direction were identical to those elicited by a combination of two corresponding AP and ML perturbations. These findings were invariable of the experimental conditions and were consistent among all the eight subjects. Thereby, we conclude that the ankle sum NJT (AP) and the ankle and hip sum NJT (ML) are the global variables being controlled. This shows that CNS controls the recovery from the multiple direction perturbations of moderate strength by decoupling the AP-ML postural space into two orthogonal directions(AP and ML).Vir: Journal of biomechanics. - ISSN 0021-9290 (Vol. 34, no. 2, 2001, str. 187-196)Vrsta gradiva - članek, sestavni del ; neleposlovje za odrasleLeto - 2001Jezik - angleškiCOBISS.SI-ID - 15997479
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Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
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Matjačić, Zlatko | 14038 |
Popović, Dejan | ![]() |
Sinkjær, Thomas | ![]() |
Vir: Osebne bibliografije
in: SICRIS
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