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Normal aging reduces motor synergies in manual pointing

Verrel, Julius; Lövdén, Martin LU and Lindenberger, Ulman (2012) In Neurobiology of Aging 33(1).
Abstract
Depending upon its organization, movement variability may reflect poor or flexible control of a motor task. We studied adult age-related differences in the structure of postural variability in manual pointing using the uncontrolled manifold (UCM) method. Participants from 2 age groups (younger: 20-30 years; older: 70-80 years; 12 subjects per group) completed a total of 120 pointing trials to 2 different targets presented according to 3 schedules: blocked, alternating, and random. The age groups were similar with respect to basic kinematic variables, end point precision, as well as the accuracy of the biomechanical forward model of the arm. Following the uncontrolled manifold approach, goal-equivalent and nongoal-equivalent components of... (More)
Depending upon its organization, movement variability may reflect poor or flexible control of a motor task. We studied adult age-related differences in the structure of postural variability in manual pointing using the uncontrolled manifold (UCM) method. Participants from 2 age groups (younger: 20-30 years; older: 70-80 years; 12 subjects per group) completed a total of 120 pointing trials to 2 different targets presented according to 3 schedules: blocked, alternating, and random. The age groups were similar with respect to basic kinematic variables, end point precision, as well as the accuracy of the biomechanical forward model of the arm. Following the uncontrolled manifold approach, goal-equivalent and nongoal-equivalent components of postural variability (goal-equivalent variability [GEV] and nongoal-equivalent variability [NGEV]) were determined for 5 time points of the movements (start, 10%, 50%, 90%, and end) and used to define a synergy index reflecting the flexibility/stability aspect of motor synergies. Toward the end of the movement, younger adults showed higher synergy indexes than older adults. Effects of target schedule were not reliable. We conclude that normal aging alters the organization of common multidegree-of-freedom movements, with older adults making less flexible use of motor abundance than younger adults. (C) 2012 Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Movement, Pointing, Variability, Coordination, Uncontrolled manifold, Aging
in
Neurobiology of Aging
volume
33
issue
1
publisher
Elsevier
external identifiers
  • wos:000297934700033
  • scopus:81355123312
ISSN
1558-1497
DOI
10.1016/j.neurobiolaging.2010.07.006
language
English
LU publication?
yes
id
20f789fb-3b1e-4a9c-9717-ed853df72a09 (old id 2333894)
date added to LUP
2012-01-30 15:42:25
date last changed
2017-09-10 03:14:30
@article{20f789fb-3b1e-4a9c-9717-ed853df72a09,
  abstract     = {Depending upon its organization, movement variability may reflect poor or flexible control of a motor task. We studied adult age-related differences in the structure of postural variability in manual pointing using the uncontrolled manifold (UCM) method. Participants from 2 age groups (younger: 20-30 years; older: 70-80 years; 12 subjects per group) completed a total of 120 pointing trials to 2 different targets presented according to 3 schedules: blocked, alternating, and random. The age groups were similar with respect to basic kinematic variables, end point precision, as well as the accuracy of the biomechanical forward model of the arm. Following the uncontrolled manifold approach, goal-equivalent and nongoal-equivalent components of postural variability (goal-equivalent variability [GEV] and nongoal-equivalent variability [NGEV]) were determined for 5 time points of the movements (start, 10%, 50%, 90%, and end) and used to define a synergy index reflecting the flexibility/stability aspect of motor synergies. Toward the end of the movement, younger adults showed higher synergy indexes than older adults. Effects of target schedule were not reliable. We conclude that normal aging alters the organization of common multidegree-of-freedom movements, with older adults making less flexible use of motor abundance than younger adults. (C) 2012 Elsevier Inc. All rights reserved.},
  author       = {Verrel, Julius and Lövdén, Martin and Lindenberger, Ulman},
  issn         = {1558-1497},
  keyword      = {Movement,Pointing,Variability,Coordination,Uncontrolled manifold,Aging},
  language     = {eng},
  number       = {1},
  publisher    = {Elsevier},
  series       = {Neurobiology of Aging},
  title        = {Normal aging reduces motor synergies in manual pointing},
  url          = {http://dx.doi.org/10.1016/j.neurobiolaging.2010.07.006},
  volume       = {33},
  year         = {2012},
}