| Title |
Alteration in neuromuscular function after a 5 km running time trial
|
|---|---|
| Published in |
European Journal of Applied Physiology, October 2011
|
| DOI | 10.1007/s00421-011-2205-8 |
| Pubmed ID | |
| Authors |
O. Girard, G. P. Millet, J.-P. Micallef, S. Racinais |
| Abstract |
The aim of this study was to characterize the effect of a 5 km running time trial on the neuromuscular properties of the plantar flexors. Eleven well-trained triathletes performed a series of neuromuscular tests before and immediately after the run on a 200 m indoor track. Muscle activation (twitch interpolation) and normalized EMG activity were assessed during maximal voluntary contraction (MVC) of plantar flexors. Maximal soleus H-reflexes and M-waves were evoked at rest (i.e. H (MAX) and M (MAX), respectively) and during MVC (i.e. H (SUP) and M (SUP), respectively). MVC significantly declined (-27%; P < 0.001) after the run, due to decrease in muscle activation (-8%; P < 0.05) and M (MAX)-normalized EMG activity (-13%; P < 0.05). Significant reductions in M-wave amplitudes (M (MAX): -13% and M (SUP): -16%; P < 0.05) as well as H (MAX)/M (MAX) (-37%; P < 0.01) and H (SUP)/M (SUP) (-25%; P < 0.05) ratios occurred with fatigue. Following exercise, the single twitch was characterized by lower peak torque (-16%; P < 0.001) as well as shorter contraction (-19%; P < 0.001) and half-relaxation (-24%; P < 0.001) times. In conclusion, the reduction in plantar flexors strength induced by a 5 km running time trial is caused by peripheral adjustments, which are attributable to a failure of the neuromuscular transmission and excitation-contraction coupling. Fatigue also decreased the magnitude of efferent motor outflow from spinal motor neurons to the plantar flexors and part of this suboptimal neural drive is the result of an inhibition of soleus motoneuron pool reflex excitability. |
X Demographics
The data shown below were collected from the profiles of 3 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Spain | 1 | 33% |
| Unknown | 2 | 67% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 3 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 116 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United Kingdom | 2 | 2% |
| France | 1 | <1% |
| Brazil | 1 | <1% |
| Italy | 1 | <1% |
| South Africa | 1 | <1% |
| United States | 1 | <1% |
| Unknown | 109 | 94% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Master | 25 | 22% |
| Student > Ph. D. Student | 18 | 16% |
| Student > Bachelor | 16 | 14% |
| Researcher | 10 | 9% |
| Professor | 10 | 9% |
| Other | 24 | 21% |
| Unknown | 13 | 11% |
| Readers by discipline | Count | As % |
|---|---|---|
| Sports and Recreations | 59 | 51% |
| Medicine and Dentistry | 16 | 14% |
| Neuroscience | 5 | 4% |
| Agricultural and Biological Sciences | 5 | 4% |
| Nursing and Health Professions | 4 | 3% |
| Other | 10 | 9% |
| Unknown | 17 | 15% |
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 18 May 2012.
All research outputs
#14,784,344
of 25,374,917 outputs
Outputs from European Journal of Applied Physiology
#2,792
of 4,345 outputs
Outputs of similar age
#93,756
of 151,229 outputs
Outputs of similar age from European Journal of Applied Physiology
#31
of 56 outputs
Altmetric has tracked 25,374,917 research outputs across all sources so far. This one is in the 41st percentile – i.e., 41% of other outputs scored the same or lower than it.
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