Shifts in Key Time Points and Strategies for a Multisegment Motor Task in Healthy Aging Subjects

Matthieu Casteran 1 Pauline Hilt 2 France Mourey 3 Patrick Manckoundia 4 Robert French 5 Elizabeth Thomas 3, *
* Auteur correspondant
1 2LPN - Laboratoire lorrain de psychologie et neurosciences de la dynamique des comportements
2 CTNSC@UniFe - Center of Translational Neurophysiology for Speech and Communication
3 CAPS - Cognition, Action, et Plasticité Sensorimotrice [Dijon - U1093]
4 Service de médecine gériatrique (CHU de Dijon - Centre gériatrique de Champmaillot - EHPAD)
5 LEAD - Laboratoire d'Etude de l'Apprentissage et du Développement [Dijon]
Abstract : In this study, we compared key temporal points in the whole body pointing movement of healthy aging and young subjects. During this movement, subject leans forward from a standing position to reach a target. As it involves forward inclination of the trunk, the movement creates a risk for falling. We examined two strategic time points during the task-first, the crossover point where the velocity of the center of mass (CoM) in the vertical dimension outstripped the velocity in the anteroposterior dimension and secondly, the time to peak of the CoM velocity profile. Transitions to stabilizing postures occur at these time points. They both occurred earlier in aging subjects. The crossover point also showed adjustments with target distance in aging subjects, while this was not observed in younger subjects. The shifts in these key time points could not be attributed to differences in movement duration between the two groups. Investigation with an optimal control model showed that the temporal adjustment as a function of target distance in the healthy aging subjects fits into a strategy that emphasized equilibrium maintenance rather than absolute work as a control strategy.
Keywords : aging Optimal control Equilibrium vertical dimension trunk structure healthy aging posture Whole body pointing Center of mass
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Article dans une revue
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https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01873657
Contributeur : Caps - Université de Bourgogne <>
Soumis le : jeudi 13 septembre 2018 - 15:03:40
Dernière modification le : lundi 11 février 2019 - 15:14:07

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UNIV-BOURGOGNE | CNRS | U1093 | LEAD_UB | UNIV-LORRAINE | 2LPN-UL

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Matthieu Casteran, Pauline Hilt, France Mourey, Patrick Manckoundia, Robert French, et al.. Shifts in Key Time Points and Strategies for a Multisegment Motor Task in Healthy Aging Subjects. Journals of Gerontology, Series A, Oxford University Press (OUP): Policy B - Oxford Open Option D, 2018, 73 (12), pp.1609-1617. ⟨10.1093/gerona/gly066⟩. ⟨hal-01873657⟩

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