Abstract：
:We investigated age-related differences in finger coordination during rotational hand actions. Two hypotheses based on earlier studies were tested: higher safety margins and lower synergy indices were expected in the elderly. Young and elderly subjects held a handle instrumented with five six-component force sensors and performed discrete accurate pronation and supination movements. The weight of the system was counterbalanced with another load. Indices of synergies stabilizing salient performance variables, such as total normal force, total tangential force, moments produced by these forces, and total moment of force were computed at two levels of a hypothetical control hierarchy, at the virtual finger-thumb level and at the individual finger level. At each level, synergy indices reflected the normalized difference between the sum of the variances of elemental variables and variance of their combined output, both computed at comparable phases over repetitive trials. The elderly group performed the task slower and showed lower safety margins for the thumb during the rotation phase. Overall, the synergy indices were not lower in the elderly group. In several cases, these indices were significantly higher in the elderly than in the younger participants. Hence, both main hypotheses have been falsified. We interpret the unexpectedly low safety margins in the elderly as resulting from several factors such as increased force variability, impaired feed-forward control, and the fact that there was no danger of dropping the object. Our results suggest that in some natural tasks, such as the one used in this study, healthy elderly persons show no impairment, as compared to younger persons, in their ability to organize digits into synergies stabilizing salient performance variables.
journal_name
Hum Mov Scijournal_title
Human movement scienceauthors
Varadhan S,Zhang W,Zatsiorsky VM,Latash MLdoi
10.1016/j.humov.2011.07.005subject
Has Abstractpub_date
2012-06-01 00:00:00pages
502-18issue
3eissn
0167-9457issn
1872-7646pii
S0167-9457(11)00109-6journal_volume
31pub_type
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journal_title：Human movement science
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更新日期：2019-02-01 00:00:00
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journal_title：Human movement science
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journal_title：Human movement science
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更新日期：2015-12-01 00:00:00
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journal_title：Human movement science
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更新日期：2012-08-01 00:00:00
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journal_title：Human movement science
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2011.10.004
更新日期：2012-08-01 00:00:00
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journal_title：Human movement science
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更新日期：2018-10-01 00:00:00
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pub_type： 杂志文章
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更新日期：2015-02-01 00:00:00
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pub_type： 杂志文章
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更新日期：2013-08-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2018.03.008
更新日期：2018-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2011.03.001
更新日期：2011-12-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章,评审
doi：10.1016/j.humov.2018.02.008
更新日期：2018-04-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章,多中心研究,随机对照试验
doi：10.1016/j.humov.2012.08.004
更新日期：2013-10-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2020.102599
更新日期：2020-04-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2018-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2017.10.012
更新日期：2018-02-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2012.07.001
更新日期：2012-12-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2007.06.003
更新日期：2007-12-01 00:00:00
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pub_type： 杂志文章
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更新日期：2019-04-10 00:00:00
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pub_type： 杂志文章
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更新日期：2001-11-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2015-12-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2010-08-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2019-04-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2019-03-22 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2019-06-28 00:00:00
