| Autor: |
Callegari B; Laboratory of Human Study Motricity, Federal University of Pará, Av. Generalíssimo Deodoro 01, Belém 66073-000, PA, Brazil., Kubicki A; INSERM U1093, Cognition Action et Plasticité Sensori-Motrice, Université de Bourgogne Franche-Comté, Dijon, France and FiKiP Hôpital Nord Franche-Comté, 2 rue du Docteur Flamand, 25200 Montbéliard, France., Saunier G; Laboratorio de Cognição Motora, Departamento de Anatomia, Universidade Federal do Pará, Rua Augusto Corrêa 01, Belém 66075-110, PA, Brazil., Duarte MB; Laboratory of Human Study Motricity, Federal University of Pará, Av. Generalíssimo Deodoro 01, Belém 66073-000, PA, Brazil., Almeida GCDS; Laboratory of Human Study Motricity, Federal University of Pará, Av. Generalíssimo Deodoro 01, Belém 66073-000, PA, Brazil., Alves BMO; Doctoral and Master's Program in Physical Therapy, UNICID, 448/475 CesárioGaleno St., São Paulo 03071-000, SP, Brazil., Amorim CF; Doctoral and Master's Program in Physical Therapy, UNICID, 448/475 CesárioGaleno St., São Paulo 03071-000, SP, Brazil.; Département des Sciences de la Santé, Programme de physiothérapie de l'université McGill offert en extension à l'UQAC, Chicoutimi, QC G7H 2B1, Canada.; Physical Therapy and Neuroscience Departments, Wertheims' Colleges of Nursing and Health Sciences and Medicine, Florida International University (FIU), Miami, FL 33199, USA., Garcez DR; Hospital Universitário Bettina Ferro de Souza, Universidade Federal do Pará, Rua Augusto Corrêa 01, Belém 66075-110, PA, Brazil., Souza GDS; Institute of Biological Sciences, Federal University of Pará, Rua Augusto Corrêa 01, Belém 66075-110, PA, Brazil., Mourey F; INSERM U1093, Cognition Action et Plasticité Sensori-motrice, Université de Bourgogne Franche-Comté, 21078 Dijon, France. |
| Abstrakt: |
Background: Anticipatory postural adjustments (APAs) are significantly affected by age and may represent restrictions on functional independence. Previous studies in young adults have already highlighted that changing postural stability (i.e., seated vs. upright posture) affects the motor planning and APAs. In frail older adults (FOAs), the effect of these different conditions of postural stability have not yet been established, and the present study aimed to disentangle this issue. Methods: Participants executed an arm-pointing task to reach a diode immediately after it turned on, under different conditions of stability (seated with and without foot support and in an upright posture). A kinematic profile of the index finger and postural electromyographic data were registered in their dominant-side leg muscles: tibialis anterior, soleus, rectus femoris, and semitendinosus. Results: The main finding of this study was that the adopted posture and body stabilization in FOAs did not reflect differences in APAs or kinematic features. In addition, they did not present an optimal APA, since postural muscles are recruited simultaneously with the deltoid. Conclusion: Thus, FOAs seem to use a single non-optimal motor plan to assist with task performance and counterbalance perturbation forces in which they present similar APAs and do not modify their kinematics features under different equilibrium constraints. |
