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X Demographics
Mendeley readers
Attention Score in Context
| Title |
Motor Variability during Sustained Contractions Increases with Cognitive Demand in Older Adults
|
|---|---|
| Published in |
Frontiers in Aging Neuroscience, May 2014
|
| DOI | 10.3389/fnagi.2014.00097 |
| Pubmed ID | |
| Authors |
Marnie L. Vanden Noven, Hugo M. Pereira, Tejin Yoon, Alyssa A. Stevens, Kristy A. Nielson, Sandra K. Hunter |
| Abstract |
To expose cortical involvement in age-related changes in motor performance, we compared steadiness (force fluctuations) and fatigability of submaximal isometric contractions with the ankle dorsiflexor muscles in older and young adults and with varying levels of cognitive demand imposed. Sixteen young (20.4 ± 2.1 year: 8 men, 9 women) and 17 older adults (68.8 ± 4.4 years: 9 men, 8 women) attended three sessions and performed a 40 s isometric contraction at 5% maximal voluntary contraction (MVC) force followed by an isometric contraction at 30% MVC until task failure. The cognitive demand required during the submaximal contractions in each session differed as follows: (1) high-cognitive demand session where difficult mental math was imposed (counting backward by 13 from a 4-digit number); (2) low-cognitive demand session which involved simple mental math (counting backward by 1); and (3) control session with no mental math. Anxiety was elevated during the high-cognitive demand session compared with other sessions for both age groups but more so for the older adults than young adults (p < 0.05). Older adults had larger force fluctuations than young adults during: (1) the 5% MVC task as cognitive demand increased (p = 0.007), and (2) the fatiguing contraction for all sessions (p = 0.002). Time to task failure did not differ between sessions or age groups (p > 0.05), but the variability between sessions (standard deviation of three sessions) was greater for older adults than young (2.02 ± 1.05 vs. 1.25 ± 0.51 min, p < 0.05). Thus, variability in lower limb motor performance for low- and moderate-force isometric tasks increased with age and was exacerbated when cognitive demand was imposed, and may be related to modulation of synergist and antagonist muscles and an altered neural strategy with age originating from central sources. These data have significant implications for cognitively demanding low-force motor tasks that are relevant to functional and ergonomic in an aging workforce. |
X Demographics
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Spain | 2 | 18% |
| United Kingdom | 2 | 18% |
| United States | 1 | 9% |
| Canada | 1 | 9% |
| Unknown | 5 | 45% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 7 | 64% |
| Scientists | 4 | 36% |
Mendeley readers
The data shown below were compiled from readership statistics for 132 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Brazil | 2 | 2% |
| France | 1 | <1% |
| Unknown | 129 | 98% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 27 | 20% |
| Student > Master | 20 | 15% |
| Student > Bachelor | 11 | 8% |
| Researcher | 9 | 7% |
| Professor > Associate Professor | 9 | 7% |
| Other | 22 | 17% |
| Unknown | 34 | 26% |
| Readers by discipline | Count | As % |
|---|---|---|
| Sports and Recreations | 21 | 16% |
| Nursing and Health Professions | 14 | 11% |
| Neuroscience | 13 | 10% |
| Engineering | 12 | 9% |
| Psychology | 12 | 9% |
| Other | 23 | 17% |
| Unknown | 37 | 28% |
Attention Score in Context
This research output has an Altmetric Attention Score of 7. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 12 November 2014.
All research outputs
#5,184,293
of 24,717,692 outputs
Outputs from Frontiers in Aging Neuroscience
#2,605
of 5,321 outputs
Outputs of similar age
#48,067
of 231,348 outputs
Outputs of similar age from Frontiers in Aging Neuroscience
#21
of 56 outputs
Altmetric has tracked 24,717,692 research outputs across all sources so far. Compared to these this one has done well and is in the 78th percentile: it's in the top 25% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 5,321 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 14.3. This one has gotten more attention than average, scoring higher than 50% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 231,348 tracked outputs that were published within six weeks on either side of this one in any source. This one has done well, scoring higher than 79% of its contemporaries.
We're also able to compare this research output to 56 others from the same source and published within six weeks on either side of this one. This one has gotten more attention than average, scoring higher than 64% of its contemporaries.