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X Demographics
Mendeley readers
Attention Score in Context
| Title |
Caffeine and Placebo Improved Maximal Exercise Performance Despite Unchanged Motor Cortex Activation and Greater Prefrontal Cortex Deoxygenation
|
|---|---|
| Published in |
Frontiers in Physiology, August 2018
|
| DOI | 10.3389/fphys.2018.01144 |
| Pubmed ID | |
| Authors |
Flavio O. Pires, Carlos A. S. dos Anjos, Roberto J. M. Covolan, Eduardo B. Fontes, Timothy D. Noakes, Alan St Clair Gibson, Fernando H. Magalhães, Carlos Ugrinowitsch |
| Abstract |
Caffeine (CAF) is an ergogenic aid used to improve exercise performance. Independent studies have suggested that caffeine may have the ability to increase corticospinal excitability, thereby decreasing the motor cortex activation required to generate a similar motor output. However, CAF has also been suggested to induce a prefrontal cortex (PFC) deoxygenation. Others have suggested that placebo (PLA) may trigger comparable effects to CAF, as independent studies found PLA effects on motor performance, corticospinal excitability, and PFC oxygenation. Thus, we investigated if CAF and CAF-perceived PLA may improve motor performance, despite the likely unchanged MC activation and greater PFC deoxygenation. Nine participants (26.4 ± 4.8 years old, VO2MAX of 42.2 ± 4.6 mL kg-1 min-1) performed three maximal incremental tests (MITs) in control (no supplementation) and ∼60 min after CAF and PLA ingestion. PFC oxygenation (near-infrared spectroscopy at Fp1 position), MC activation (EEG at Cz position) and vastus lateralis and rectus femoris muscle activity (EMG) were measured throughout the tests. Compared to control, CAF and PLA increased rectus femoris muscle EMG (P = 0.030; F = 2.88; d = 0.84) at 100% of the MIT, and enhanced the peak power output (P = 0.006; F = 12.97; d = 1.8) and time to exhaustion (P = 0.007; F = 12.97; d = 1.8). In contrast, CAF and PLA did not change MC activation, but increased the PFC deoxygenation as indicated by the lower O2Hb (P = 0.001; F = 4.68; d = 1.08) and THb concentrations (P = 0.01; F = 1.96; d = 0.7) at 80 and 100% the MIT duration. These results showed that CAF and CAF-perceived PLA had the ability to improve motor performance, despite unchanged MC activation and greater PFC deoxygenation. The effectiveness of CAF as ergogenic aid to improve MIT performance was challenged. |
X Demographics
The data shown below were collected from the profiles of 14 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Brazil | 6 | 43% |
| United States | 2 | 14% |
| United Kingdom | 2 | 14% |
| South Africa | 1 | 7% |
| Venezuela, Bolivarian Republic of | 1 | 7% |
| Unknown | 2 | 14% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 9 | 64% |
| Scientists | 5 | 36% |
Mendeley readers
The data shown below were compiled from readership statistics for 88 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 88 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Master | 20 | 23% |
| Student > Bachelor | 13 | 15% |
| Researcher | 8 | 9% |
| Student > Ph. D. Student | 8 | 9% |
| Student > Doctoral Student | 4 | 5% |
| Other | 11 | 13% |
| Unknown | 24 | 27% |
| Readers by discipline | Count | As % |
|---|---|---|
| Sports and Recreations | 18 | 20% |
| Nursing and Health Professions | 12 | 14% |
| Neuroscience | 9 | 10% |
| Medicine and Dentistry | 6 | 7% |
| Psychology | 5 | 6% |
| Other | 9 | 10% |
| Unknown | 29 | 33% |
Attention Score in Context
This research output has an Altmetric Attention Score of 9. 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 21 June 2019.
All research outputs
#3,656,122
of 23,138,859 outputs
Outputs from Frontiers in Physiology
#1,870
of 13,899 outputs
Outputs of similar age
#70,921
of 333,329 outputs
Outputs of similar age from Frontiers in Physiology
#103
of 493 outputs
Altmetric has tracked 23,138,859 research outputs across all sources so far. Compared to these this one has done well and is in the 84th percentile: it's in the top 25% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 13,899 research outputs from this source. They typically receive more attention than average, with a mean Attention Score of 7.6. This one has done well, scoring higher than 86% 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 333,329 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 78% of its contemporaries.
We're also able to compare this research output to 493 others from the same source and published within six weeks on either side of this one. This one has done well, scoring higher than 79% of its contemporaries.