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X Demographics
Mendeley readers
Attention Score in Context
| Title |
Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis
|
|---|---|
| Published in |
Journal of the International Society of Sports Nutrition, April 2022
|
| DOI | 10.1186/s12970-018-0216-0 |
| Pubmed ID | |
| Authors |
Jozo Grgic, Eric T. Trexler, Bruno Lazinica, Zeljko Pedisic |
| Abstract |
Caffeine is commonly used as an ergogenic aid. Literature about the effects of caffeine ingestion on muscle strength and power is equivocal. The aim of this systematic review and meta-analysis was to summarize results from individual studies on the effects of caffeine intake on muscle strength and power. A search through eight databases was performed to find studies on the effects of caffeine on: (i) maximal muscle strength measured using 1 repetition maximum tests; and (ii) muscle power assessed by tests of vertical jump. Meta-analyses of standardized mean differences (SMD) between placebo and caffeine trials from individual studies were conducted using the random effects model. Ten studies on the strength outcome and ten studies on the power outcome met the inclusion criteria for the meta-analyses. Caffeine ingestion improved both strength (SMD = 0.20; 95% confidence interval [CI]: 0.03, 0.36;p = 0.023) and power (SMD = 0.17; 95% CI: 0.00, 0.34;p = 0.047). A subgroup analysis indicated that caffeine significantly improves upper (SMD = 0.21; 95% CI: 0.02, 0.39;p = 0.026) but not lower body strength (SMD = 0.15; 95% CI: -0.05, 0.34;p = 0.147). The meta-analyses showed significant ergogenic effects of caffeine ingestion on maximal muscle strength of upper body and muscle power. Future studies should more rigorously control the effectiveness of blinding. Due to the paucity of evidence, additional findings are needed in the female population and using different forms of caffeine, such as gum and gel. |
X Demographics
The data shown below were collected from the profiles of 265 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 44 | 17% |
| United Kingdom | 27 | 10% |
| Spain | 19 | 7% |
| Japan | 11 | 4% |
| Australia | 9 | 3% |
| Canada | 6 | 2% |
| Brazil | 5 | 2% |
| Colombia | 3 | 1% |
| Mexico | 2 | <1% |
| Other | 29 | 11% |
| Unknown | 110 | 42% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 172 | 65% |
| Scientists | 51 | 19% |
| Practitioners (doctors, other healthcare professionals) | 40 | 15% |
| Science communicators (journalists, bloggers, editors) | 1 | <1% |
| Unknown | 1 | <1% |
Mendeley readers
The data shown below were compiled from readership statistics for 710 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 710 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Bachelor | 139 | 20% |
| Student > Master | 101 | 14% |
| Student > Ph. D. Student | 47 | 7% |
| Other | 34 | 5% |
| Researcher | 33 | 5% |
| Other | 86 | 12% |
| Unknown | 270 | 38% |
| Readers by discipline | Count | As % |
|---|---|---|
| Sports and Recreations | 175 | 25% |
| Nursing and Health Professions | 73 | 10% |
| Medicine and Dentistry | 61 | 9% |
| Agricultural and Biological Sciences | 26 | 4% |
| Biochemistry, Genetics and Molecular Biology | 22 | 3% |
| Other | 56 | 8% |
| Unknown | 297 | 42% |
Attention Score in Context
This research output has an Altmetric Attention Score of 307. 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 11 March 2024.
All research outputs
#113,708
of 25,708,267 outputs
Outputs from Journal of the International Society of Sports Nutrition
#48
of 950 outputs
Outputs of similar age
#3,642
of 449,286 outputs
Outputs of similar age from Journal of the International Society of Sports Nutrition
#47
of 852 outputs
Altmetric has tracked 25,708,267 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 950 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 64.9. This one has done particularly well, scoring higher than 94% 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 449,286 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 852 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 94% of its contemporaries.