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Effects of Matched Intermittent and Continuous Exercise on Changes of Cardiac Biomarkers in Endurance Runners
PURPOSE: Endurance runners training with high-intensity intermittent exercise might experience damage to cardiac muscle. We have therefore compared changes of cardiac biomarkers after workload-matched intermittent and continuous exercise. METHODS: Twelve endurance runners [11 males, 1 female; means...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7005585/ https://www.ncbi.nlm.nih.gov/pubmed/32082191 http://dx.doi.org/10.3389/fphys.2020.00030 |
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author | Li, Feifei Nie, Jinlei Zhang, Haifeng Fu, Frank Yi, Longyan Hopkins, Will Liu, Yang Lu, Yifan |
author_facet | Li, Feifei Nie, Jinlei Zhang, Haifeng Fu, Frank Yi, Longyan Hopkins, Will Liu, Yang Lu, Yifan |
author_sort | Li, Feifei |
collection | PubMed |
description | PURPOSE: Endurance runners training with high-intensity intermittent exercise might experience damage to cardiac muscle. We have therefore compared changes of cardiac biomarkers after workload-matched intermittent and continuous exercise. METHODS: Twelve endurance runners [11 males, 1 female; means ± SD [Formula: see text] O(2)(max), 62.4 ± 5.4 ml kg(–1) min(–1); velocity of [Formula: see text] O(2)(max) (v [Formula: see text] O(2)(max)), 17.1 ± 1.4 km h(–1)] completed an intermittent and continuous exercise trial in random order. Intermittent exercise consisted of running at 90% v [Formula: see text] O(2)(max) for 2 min followed by 50% v [Formula: see text] O(2)(max) for 2 min, repeated for 92 min. Continuous exercise was performed at 70% v [Formula: see text] O(2)(max) for 92 min. Blood samples were drawn before and 0, 2, 4, 24, and 48 h after exercise for assay of various cardiac biomarkers. Changes in concentration of biomarkers were averaged for the comparison of intermittent with continuous exercise after adjustment for baseline concentration and exercise intensity expressed as percent of heart-rate reserve (%HRR); magnitudes were assessed by standardization. RESULTS: There were moderate and large increases in high-sensitivity cardiac troponin-I and -T respectively following exercise. The differences between the increases adjusted to the mean intensity of 78 %HRR were trivial, but at 85 %HRR the increases for cardiac troponin-I and -T were moderately higher for intermittent compared with continuous exercise (factor difference, ×/÷90% confidence limits: 3.4, ×/÷1.9 and 2.1, ×/÷1.8 respectively). Differences in the changes in other cardiac biomarkers were trivial. CONCLUSION: Prolonged intermittent exercise is potentially more damaging to cardiac muscle than continuous exercise of the same average running speed at higher average heart rates in endurance runners. |
format | Online Article Text |
id | pubmed-7005585 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-70055852020-02-20 Effects of Matched Intermittent and Continuous Exercise on Changes of Cardiac Biomarkers in Endurance Runners Li, Feifei Nie, Jinlei Zhang, Haifeng Fu, Frank Yi, Longyan Hopkins, Will Liu, Yang Lu, Yifan Front Physiol Physiology PURPOSE: Endurance runners training with high-intensity intermittent exercise might experience damage to cardiac muscle. We have therefore compared changes of cardiac biomarkers after workload-matched intermittent and continuous exercise. METHODS: Twelve endurance runners [11 males, 1 female; means ± SD [Formula: see text] O(2)(max), 62.4 ± 5.4 ml kg(–1) min(–1); velocity of [Formula: see text] O(2)(max) (v [Formula: see text] O(2)(max)), 17.1 ± 1.4 km h(–1)] completed an intermittent and continuous exercise trial in random order. Intermittent exercise consisted of running at 90% v [Formula: see text] O(2)(max) for 2 min followed by 50% v [Formula: see text] O(2)(max) for 2 min, repeated for 92 min. Continuous exercise was performed at 70% v [Formula: see text] O(2)(max) for 92 min. Blood samples were drawn before and 0, 2, 4, 24, and 48 h after exercise for assay of various cardiac biomarkers. Changes in concentration of biomarkers were averaged for the comparison of intermittent with continuous exercise after adjustment for baseline concentration and exercise intensity expressed as percent of heart-rate reserve (%HRR); magnitudes were assessed by standardization. RESULTS: There were moderate and large increases in high-sensitivity cardiac troponin-I and -T respectively following exercise. The differences between the increases adjusted to the mean intensity of 78 %HRR were trivial, but at 85 %HRR the increases for cardiac troponin-I and -T were moderately higher for intermittent compared with continuous exercise (factor difference, ×/÷90% confidence limits: 3.4, ×/÷1.9 and 2.1, ×/÷1.8 respectively). Differences in the changes in other cardiac biomarkers were trivial. CONCLUSION: Prolonged intermittent exercise is potentially more damaging to cardiac muscle than continuous exercise of the same average running speed at higher average heart rates in endurance runners. Frontiers Media S.A. 2020-01-31 /pmc/articles/PMC7005585/ /pubmed/32082191 http://dx.doi.org/10.3389/fphys.2020.00030 Text en Copyright © 2020 Li, Nie, Zhang, Fu, Yi, Hopkins, Liu and Lu. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Physiology Li, Feifei Nie, Jinlei Zhang, Haifeng Fu, Frank Yi, Longyan Hopkins, Will Liu, Yang Lu, Yifan Effects of Matched Intermittent and Continuous Exercise on Changes of Cardiac Biomarkers in Endurance Runners |
title | Effects of Matched Intermittent and Continuous Exercise on Changes of Cardiac Biomarkers in Endurance Runners |
title_full | Effects of Matched Intermittent and Continuous Exercise on Changes of Cardiac Biomarkers in Endurance Runners |
title_fullStr | Effects of Matched Intermittent and Continuous Exercise on Changes of Cardiac Biomarkers in Endurance Runners |
title_full_unstemmed | Effects of Matched Intermittent and Continuous Exercise on Changes of Cardiac Biomarkers in Endurance Runners |
title_short | Effects of Matched Intermittent and Continuous Exercise on Changes of Cardiac Biomarkers in Endurance Runners |
title_sort | effects of matched intermittent and continuous exercise on changes of cardiac biomarkers in endurance runners |
topic | Physiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7005585/ https://www.ncbi.nlm.nih.gov/pubmed/32082191 http://dx.doi.org/10.3389/fphys.2020.00030 |
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