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X Demographics
Mendeley readers
Attention Score in Context
| Title |
The neurophysiology of central and peripheral fatigue during sub-maximal lower limb isometric contractions
|
|---|---|
| Published in |
Frontiers in Human Neuroscience, January 2013
|
| DOI | 10.3389/fnhum.2013.00135 |
| Pubmed ID | |
| Authors |
Marika Berchicci, Federica Menotti, Andrea Macaluso, Francesco Di Russo |
| Abstract |
Fatigue has been defined as an exercise-induced decline in force generation capacity because of changes at both the peripheral and central levels. Movement is preceded and accompanied by brain activities related to the preparation and execution of movement (movement related cortical potentials, MRCP), which have been correlated with the perception of effort (RPE). We combined force measurements, surface electromyography (sEMG), peripheral electrical stimulation (maximal twitch, MT) and MRCP analysis to further our understanding of the neural correlates of peripheral and central changes during a fatiguing task involving the lower limbs. Eighteen healthy volunteers performed 4 blocks of isometric knee extensions at 40% of the maximal voluntary contraction (MVC) for a total of 240 2-s contractions. At the baseline and after each block, we measured RPE, MT and MVC. We simultaneously recorded the force of the knee extensor muscles, root mean square (RMS) of the sEMG of the vastus lateralis muscle, and electroencephalography (EEG) from 64 channels. The MRCPs were extracted from the EEG recordings and averaged in the early (Block 1-2) and late (Block 3-4) blocks. Two cohorts were obtained by cluster analysis based on the RPE (i.e., perception of effort) and MT (i.e., peripheral fatigue). We observed a significant decline in both the MVC (-13%) and RMS (-25%) of the sEMG signal over the course of the task; thus, muscle fatigue had occurred in all of the participants regardless of the cohort. The MRCP amplitude was larger in the fatigued than the non-fatigued MT cohort in the supplementary and premotor areas, whereas the MRCP amplitude was larger in the fatigued than the non-fatigued RPE cohort in the aforementioned areas, and also in the primary motor and prefrontal cortices (PFC). The increase in the positive activity of the PFC, along with the perception of effort, represents a novel result, suggesting that it is modulated more by the perception of effort than peripheral fatigue. |
X Demographics
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United Kingdom | 1 | 33% |
| United States | 1 | 33% |
| Unknown | 1 | 33% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Scientists | 2 | 67% |
| Members of the public | 1 | 33% |
Mendeley readers
The data shown below were compiled from readership statistics for 233 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Brazil | 3 | 1% |
| United Kingdom | 1 | <1% |
| Italy | 1 | <1% |
| United States | 1 | <1% |
| Unknown | 227 | 97% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Bachelor | 44 | 19% |
| Student > Master | 39 | 17% |
| Student > Ph. D. Student | 35 | 15% |
| Researcher | 19 | 8% |
| Student > Doctoral Student | 14 | 6% |
| Other | 42 | 18% |
| Unknown | 40 | 17% |
| Readers by discipline | Count | As % |
|---|---|---|
| Sports and Recreations | 58 | 25% |
| Medicine and Dentistry | 38 | 16% |
| Nursing and Health Professions | 18 | 8% |
| Agricultural and Biological Sciences | 15 | 6% |
| Engineering | 13 | 6% |
| Other | 34 | 15% |
| Unknown | 57 | 24% |
Attention Score in Context
This research output has an Altmetric Attention Score of 2. 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 14 August 2013.
All research outputs
#14,168,358
of 22,707,247 outputs
Outputs from Frontiers in Human Neuroscience
#4,581
of 7,125 outputs
Outputs of similar age
#167,493
of 280,717 outputs
Outputs of similar age from Frontiers in Human Neuroscience
#617
of 862 outputs
Altmetric has tracked 22,707,247 research outputs across all sources so far. This one is in the 35th percentile – i.e., 35% of other outputs scored the same or lower than it.
So far Altmetric has tracked 7,125 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 14.5. This one is in the 32nd percentile – i.e., 32% 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 280,717 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 38th percentile – i.e., 38% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 862 others from the same source and published within six weeks on either side of this one. This one is in the 25th percentile – i.e., 25% of its contemporaries scored the same or lower than it.