Journal article
Effect of aging on inter-joint synergies during machine-paced assembly tasks
Experimental brain research, Vol.231(2), pp.249-256
11/2013
Handle:
https://hdl.handle.net/2376/112834
PMID: 23995629
Abstract
In recent years, uncontrolled manifold (UCM) analysis has emerged as an important method to study variability of human movements. The current study investigated the upper extremity movements during typical assembly tasks using the framework of the UCM analysis. Younger and older participants performed machine-paced assembly tasks, while the kinematics of upper extremities were recorded using a motion tracking system. The upper extremity was modeled as a 7 degrees-of-freedom system. The variance of joint angles within the UCM space (V
UCM) and the variance perpendicular to the UCM space (V
ORT) were analyzed. The results indicated that V
UCM were not significantly different for the older and younger groups. For the older group, V
ORT was significantly less than the younger group and resulted in less total variance (V
TOT) and a better synergy level (Z
ΔV
). Therefore, the synergies of upper extremity movement may not be impaired for machine-paced tasks as people age. While current results showed a different effect of aging on the synergies of body movement compared with one previous study, they were in line with a recently proposed theory that for natural tasks, aging people did not have impairment in the ability to organize upper extremity movement into synergies.
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Details
- Title
- Effect of aging on inter-joint synergies during machine-paced assembly tasks
- Creators
- Xu Xu - Liberty Mutual Research Institute for Safety 71 Frankland Road Hopkinton MA 01748 USAJin Qin - Department of Work Environment University of Massachusetts Lowell 1 University Avenue Lowell MA 01854 USARobert Catena - Department of Physical Therapy University of Evansville 1800 Lincoln Avenue Evansville IN 47722 USAGert Faber - Faculty of Human Movement Sciences, Institute for Fundamental and Clinical Human Movement Sciences VU University Van der Boechorststraat 9 1081 BT Amsterdam The NetherlandsJia-Hua Lin - Liberty Mutual Research Institute for Safety 71 Frankland Road Hopkinton MA 01748 USA
- Publication Details
- Experimental brain research, Vol.231(2), pp.249-256
- Academic Unit
- UNKNOWN
- Publisher
- Springer Berlin Heidelberg; Berlin/Heidelberg
- Identifiers
- 99900548117201842
- Language
- English
- Resource Type
- Journal article