Postural Adjustments and Kinematic Index Finger Features in Frail Older Adults under Different Equilibrium Constraints.
Fiche publication
Date publication
juillet 2021
Journal
Healthcare (Basel, Switzerland)
Auteurs
Membres identifiés du Cancéropôle Est :
Pr MOUREY France
Tous les auteurs :
Callegari B, Kubicki A, Saunier G, Duarte MB, Almeida GCDS, Alves BMO, Amorim CF, Garcez DR, Souza GDS, Mourey F
Lien Pubmed
Résumé
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. 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. 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. 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.
Mots clés
frailty, postural adjustments, stability, surface electromyography
Référence
Healthcare (Basel). 2021 Jul 21;9(8):