| Title |
Independent and combined effects of liquid carbohydrate/essential amino acid ingestion on hormonal and muscular adaptations following resistance training in untrained men
|
|---|---|
| Published in |
European Journal of Applied Physiology, March 2006
|
| DOI | 10.1007/s00421-005-0127-z |
| Pubmed ID | |
| Authors |
Stephen P. Bird, Kyle M. Tarpenning, Frank E. Marino |
| Abstract |
This investigation examined chronic alteration of the acute hormonal response associated with liquid carbohydrate (CHO) and/or essential amino acid (EAA) ingestion on hormonal and muscular adaptations following resistance training. Thirty-two untrained young men performed 12 weeks of resistance training twice a week, consuming ~675 ml of either, a 6% CHO solution, 6 g EAA mixture, combined CHO + EAA supplement or placebo (PLA). Blood samples were obtained pre- and post-exercise (week 0, 4, 8, and 12), for determination of glucose, insulin, and cortisol. 3-Methylhistidine excretion and muscle fibre cross-sectional area (fCSA) were determined pre- and post-training. Post-exercise cortisol increased (P<0.05) during each training phase for PLA. No change was displayed by EAA; CHO and CHO + EAA demonstrated post-exercise decreases (P<0.05). All groups displayed reduced pre-exercise cortisol at week 12 compared to week 0 (P<0.05). Post-exercise insulin concentrations showed no change for PLA; increases were observed for the treatment groups (P<0.05), which remained greater for CHO and CHO + EAA (P<0.001) than PLA. EAA and CHO ingestion attenuated 3-methylhistidine excretion 48 h following the exercise bout. CHO + EAA resulted in a 26% decrease (P<0.01), while PLA displayed a 52% increase (P<0.01). fCSA increased across groups for type I, IIa, and IIb fibres (P<0.05), with CHO + EAA displaying the greatest gains in fCSA relative to PLA (P<0.05). These data indicate that CHO + EAA ingestion enhances muscle anabolism following resistance training to a greater extent than either CHO or EAA consumed independently. The synergistic effect of CHO + EAA ingestion maximises the anabolic response presumably by attenuating the post-exercise rise in protein degradation. |
X Demographics
The data shown below were collected from the profiles of 24 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 | 11 | 46% |
| Australia | 1 | 4% |
| United States | 1 | 4% |
| Costa Rica | 1 | 4% |
| United Kingdom | 1 | 4% |
| Unknown | 9 | 38% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 14 | 58% |
| Practitioners (doctors, other healthcare professionals) | 7 | 29% |
| Scientists | 2 | 8% |
| Unknown | 1 | 4% |
Mendeley readers
The data shown below were compiled from readership statistics for 152 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 3 | 2% |
| Portugal | 1 | <1% |
| Australia | 1 | <1% |
| Germany | 1 | <1% |
| Denmark | 1 | <1% |
| Brazil | 1 | <1% |
| Unknown | 144 | 95% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Master | 24 | 16% |
| Student > Bachelor | 23 | 15% |
| Student > Ph. D. Student | 18 | 12% |
| Researcher | 13 | 9% |
| Student > Doctoral Student | 12 | 8% |
| Other | 29 | 19% |
| Unknown | 33 | 22% |
| Readers by discipline | Count | As % |
|---|---|---|
| Sports and Recreations | 36 | 24% |
| Medicine and Dentistry | 21 | 14% |
| Nursing and Health Professions | 19 | 13% |
| Agricultural and Biological Sciences | 10 | 7% |
| Biochemistry, Genetics and Molecular Biology | 10 | 7% |
| Other | 21 | 14% |
| Unknown | 35 | 23% |
Attention Score in Context
This research output has an Altmetric Attention Score of 29. 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 May 2023.
All research outputs
#1,343,608
of 25,371,288 outputs
Outputs from European Journal of Applied Physiology
#430
of 4,345 outputs
Outputs of similar age
#2,355
of 86,017 outputs
Outputs of similar age from European Journal of Applied Physiology
#1
of 12 outputs
Altmetric has tracked 25,371,288 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 94th percentile: it's in the top 10% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 4,345 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 14.6. This one has done particularly well, scoring higher than 90% of its peers.
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We're also able to compare this research output to 12 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 91% of its contemporaries.