| Title |
Effects of 17-day spaceflight on knee extensor muscle function and size
|
|---|---|
| Published in |
European Journal of Applied Physiology, October 2004
|
| DOI | 10.1007/s00421-004-1236-9 |
| Pubmed ID | |
| Authors |
Per A. Tesch, Hans E. Berg, Daniel Bring, Harlan J. Evans, Adrian D. LeBlanc |
| Abstract |
It is generally held that space travelers experience muscle dysfunction and atrophy during exposure to microgravity. However, observations are scarce and reports somewhat inconsistent with regard to the time course, specificity and magnitude of such changes. Hence, we examined four male astronauts (group mean approximately 43 years, 86 kg and 183 cm) before and after a 17-day spaceflight (Space Transport System-78). Knee extensor muscle function was measured during maximal bilateral voluntary isometric and iso-inertial concentric, and eccentric actions. Cross-sectional area (CSA) of the knee extensor and flexor, and gluteal muscle groups was assessed by means of magnetic resonance imaging. The decrease in strength (P<0.05) across different muscle actions after spaceflight amounted to 10%. Eight ambulatory men, examined on two occasions 20 days apart, showed unchanged (P>0.05) muscle strength. CSA of the knee extensor and gluteal muscles, each decreased (P<0.05) by 8%. Knee flexor muscle CSA showed no significant (P>0.05) change. The magnitude of these changes concord with earlier results from ground-based studies of similar duration. The results of this study, however, do contrast with the findings of no decrease in maximal voluntary ankle plantar flexor force previously reported in the same crew. |
Mendeley readers
The data shown below were compiled from readership statistics for 97 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United Kingdom | 2 | 2% |
| United States | 2 | 2% |
| Brazil | 1 | 1% |
| Norway | 1 | 1% |
| Poland | 1 | 1% |
| Unknown | 90 | 93% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 15 | 15% |
| Researcher | 15 | 15% |
| Student > Master | 14 | 14% |
| Student > Bachelor | 11 | 11% |
| Other | 5 | 5% |
| Other | 15 | 15% |
| Unknown | 22 | 23% |
| Readers by discipline | Count | As % |
|---|---|---|
| Sports and Recreations | 25 | 26% |
| Medicine and Dentistry | 11 | 11% |
| Agricultural and Biological Sciences | 10 | 10% |
| Nursing and Health Professions | 5 | 5% |
| Engineering | 5 | 5% |
| Other | 12 | 12% |
| Unknown | 29 | 30% |
Attention Score in Context
This research output has an Altmetric Attention Score of 3. 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 03 June 2013.
All research outputs
#8,534,976
of 25,373,627 outputs
Outputs from European Journal of Applied Physiology
#2,159
of 4,345 outputs
Outputs of similar age
#24,643
of 75,726 outputs
Outputs of similar age from European Journal of Applied Physiology
#7
of 16 outputs
Altmetric has tracked 25,373,627 research outputs across all sources so far. This one is in the 43rd percentile – i.e., 43% of other outputs scored the same or lower than it.
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We're also able to compare this research output to 16 others from the same source and published within six weeks on either side of this one. This one is in the 37th percentile – i.e., 37% of its contemporaries scored the same or lower than it.