| Influence of high- and low-carbohydrate diet following glycogen-depleting exercise on heart rate variability and plasma catecholamines. | |
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MedLine Citation:
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PMID: 20725122 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this study was to investigate the effects of a short-term low- or high-carbohydrate (CHO) diet consumed after exercise on sympathetic nervous system activity. Twelve healthy males underwent a progressive incremental test; a control measurement of plasma catecholamines and heart rate variability (HRV); an exercise protocol to reduce endogenous CHO stores; a low- or high-CHO diet (counterbalanced order) consumed for 2 days, beginning immediately after the exercise protocol; and a second resting plasma catecholamine and HRV measurement. The exercise and diet protocols and the second round of measurements were performed again after a 1-week washout period. The mean (+/-SD) values of the standard deviation of R-R intervals were similar between conditions (control, 899.0+/-146.1 ms; low-CHO diet, 876.8+/-115.8 ms; and high-CHO diet, 878.7+/-127.7 ms). The absolute high- and low-frequency (HF and LF, respectively) densities of the HRV power spectrum were also not different between conditions. However, normalized HF and LF (i.e., relative to the total power spectrum) were lower and higher, respectively, in the low-CHO diet than in the control diet (mean+/-SD, 17+/-9 normalized units (NU) and 83+/-9 NU vs. 27+/-11 NU and 73+/-17 NU, respectively; p<0.05). The LF/HF ratio was higher with the low-CHO diet than with the control diet (mean+/-SD, 7.2+/-6.2 and 4.2+/-3.2, respectively; p<0.05). The mean values of plasma catecholamines were not different between diets. These results suggest that the autonomic control of the heart rate was modified after a short-term low-CHO diet, but plasma catecholamine levels were not altered. |
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Authors:
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Adriano Eduardo Lima-Silva; Rômulo Bertuzzi; Elen Dalquano; Marie Nogueira; Dulce Casarini; Maria Augusta Kiss; Carlos Ugrinowitsch; Flávio de Oliveira Pires |
Publication Detail:
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Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Applied physiology, nutrition, and metabolism = Physiologie appliquée, nutrition et métabolisme Volume: 35 ISSN: 1715-5312 ISO Abbreviation: Appl Physiol Nutr Metab Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-20 Completed Date: 2010-10-19 Revised Date: 2011-01-05 |
Medline Journal Info:
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Nlm Unique ID: 101264333 Medline TA: Appl Physiol Nutr Metab Country: Canada |
Other Details:
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Languages: eng Pagination: 541-7 Citation Subset: IM |
Affiliation:
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Sports Science Research Group, Federal University of Alagoas, Lorival Melo Mota Avenue S/N, Tabuleiro do Martins, Maceió, Alagoas, Brazil. adrianosilva@usp.br |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Biological Markers / blood Catecholamines / blood* Diet, Carbohydrate-Restricted* Dietary Carbohydrates / administration & dosage* Exercise* Glycogen / metabolism* Heart / innervation* Heart Rate* Humans Male Muscle Contraction Muscle, Skeletal / metabolism*, physiopathology Respiratory Mechanics Sympathetic Nervous System / metabolism* Time Factors Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Biological Markers; 0/Catecholamines; 0/Dietary Carbohydrates; 9005-79-2/Glycogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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