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A tensor decomposition reveals ageing-induced differences in muscle and grip-load force couplings during object
Chang Ye1, Seyed Saman Saboksayr1, William Shaw2
1Department of Electrical and Computer Engineering, University of Rochester, Rochester, 14620, USA.
Scientific Reports
|June 17, 2024
Summary
Motor patterns for lifting objects change with age. Older adults show stronger muscle coupling and less economical grasping, potentially to compensate for reduced manual dexterity.
Area of Science:
- Biomechanics
- Neuroscience
- Human Aging Research
Background:
- Object lifting involves complex motor patterns.
- Aging affects motor control and dexterity.
- Understanding age-related changes in motor strategies is crucial.
Purpose of the Study:
- To characterize age-related changes in motor patterns during object lifting.
- To develop a methodology for analyzing motor strategies across age groups.
- To identify specific motor components affected by aging.
Main Methods:
- Utilized a bimanual grasp-lift-replace protocol with younger and older adults.
- Combined muscle activity measurements with grip and load forces.
- Employed tensor decomposition to analyze muscle activity and force patterns.
Main Results:
- Identified three distinct motor components differentially recruited by age groups.
- Advanced age and reduced manual dexterity predicted coupled forearm and hand muscle activation.
- This coupling was associated with higher grip forces.
Conclusions:
- Aging may lead to increased muscle coupling in the distal upper limb.
- Older adults may adopt less economical grasping strategies.
- These strategies may compensate for age-related declines in manual dexterity.
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