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Attention Score in Context
| Title |
Decline in isokinetic force with age: muscle cross-sectional area and specific force
|
|---|---|
| Published in |
Pflügers Archiv - European Journal of Physiology, June 1997
|
| DOI | 10.1007/s004240050392 |
| Pubmed ID | |
| Authors |
S. A. Jubrias, I. R. Odderson, Peter C. Esselman, Kevin E. Conley |
| Abstract |
Humans produce less muscle force (F) as they age. However, the relationship between decreased force and muscle cross-sectional area (CSA) in older humans is not well documented. We examined changes in F and CSA to determine the relative contributions of muscle atrophy and specific force (F/CSA) to declining force production in aging humans. The proportions of myosin heavy chain (MHC) isoforms were characterized to assess whether this was related to changes in specific force with age. We measured the peak force of isokinetic knee extension in 57 males and females aged 23-80 years, and used magnetic resonance imaging to determine the contractile area of the quadriceps muscle. Analysis of MHC isoforms taken from biopsies of the vastus lateralis muscle showed no relation to specific force. F, CSA, and F/CSA decreased with age. Smaller CSA accounted for only about half of the 39% drop in force that occurred between ages 65-80 years. Specific force dropped about 1.5% per year in this age range, for a total decrease of 21%. Thus, quantitative changes in muscle (atrophy) are not sufficient to explain the strength loss associated with aging. |
X Demographics
The data shown below were collected from the profile of 1 X user who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United Kingdom | 1 | 100% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Scientists | 1 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 148 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 5 | 3% |
| United Kingdom | 2 | 1% |
| Belgium | 1 | <1% |
| Brazil | 1 | <1% |
| Unknown | 139 | 94% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 36 | 24% |
| Student > Master | 21 | 14% |
| Student > Bachelor | 15 | 10% |
| Student > Doctoral Student | 12 | 8% |
| Researcher | 10 | 7% |
| Other | 27 | 18% |
| Unknown | 27 | 18% |
| Readers by discipline | Count | As % |
|---|---|---|
| Medicine and Dentistry | 32 | 22% |
| Sports and Recreations | 25 | 17% |
| Engineering | 15 | 10% |
| Agricultural and Biological Sciences | 12 | 8% |
| Nursing and Health Professions | 9 | 6% |
| Other | 19 | 13% |
| Unknown | 36 | 24% |
Attention Score in Context
This research output has an Altmetric Attention Score of 1. 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 29 August 2013.
All research outputs
#20,656,820
of 25,374,917 outputs
Outputs from Pflügers Archiv - European Journal of Physiology
#1,627
of 2,055 outputs
Outputs of similar age
#27,889
of 29,199 outputs
Outputs of similar age from Pflügers Archiv - European Journal of Physiology
#3
of 3 outputs
Altmetric has tracked 25,374,917 research outputs across all sources so far. This one is in the 10th percentile – i.e., 10% of other outputs scored the same or lower than it.
So far Altmetric has tracked 2,055 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 5.1. This one is in the 9th percentile – i.e., 9% of its peers scored the same or lower than it.
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 29,199 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 2nd percentile – i.e., 2% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 3 others from the same source and published within six weeks on either side of this one.