A tensor decomposition reveals ageing-induced differences in muscle and grip-load force couplings during object lifting.

Autor: Ye C; Department of Electrical and Computer Engineering, University of Rochester, Rochester, 14620, USA., Saboksayr SS; Department of Electrical and Computer Engineering, University of Rochester, Rochester, 14620, USA., Shaw W; School of Biomedical Sciences, University of Leeds, Leeds, LS2 9JT, UK., Coats RO; School of Psychology, University of Leeds, Leeds, LS2 9JT, UK., Astill SL; School of Biomedical Sciences, University of Leeds, Leeds, LS2 9JT, UK., Mateos G; Department of Electrical and Computer Engineering, University of Rochester, Rochester, 14620, USA. gmateosb@ece.rochester.edu., Delis I; School of Biomedical Sciences, University of Leeds, Leeds, LS2 9JT, UK. i.delis@leeds.ac.uk.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Jun 17; Vol. 14 (1), pp. 13937. Date of Electronic Publication: 2024 Jun 17.
DOI: 10.1038/s41598-024-62768-8
Abstrakt: Do motor patterns of object lifting movements change as a result of ageing? Here we propose a methodology for the characterization of these motor patterns across individuals of different age groups. Specifically, we employ a bimanual grasp-lift-replace protocol with younger and older adults and combine measurements of muscle activity with grip and load forces to provide a window into the motor strategies supporting effective object lifts. We introduce a tensor decomposition to identify patterns of muscle activity and grip-load force ratios while also characterizing their temporal profiles and relative activation across object weights and participants of different age groups. We then probe age-induced changes in these components. A classification analysis reveals three motor components that are differentially recruited between the two age groups. Linear regression analyses further show that advanced age and poorer manual dexterity can be predicted by the coupled activation of forearm and hand muscles which is associated with high levels of grip force. Our findings suggest that ageing may induce stronger muscle couplings in distal aspects of the upper limbs, and a less economic grasping strategy to overcome age-related decline in manual dexterity.
(© 2024. The Author(s).)
Databáze: MEDLINE
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