| Autonomic nervous system adaptations to short-term exercise training. | |
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MedLine Citation:
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PMID: 1576853 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Signs of sympathetic hyperactivity and low parasympathetic activity have been found during the acute and recovery phases of myocardial infarction and have been associated with an increased risk of cardiac mortality. Beneficial effects of physical training have been recently reported in post-myocardial infarction patients. We tested the hypothesis that physical training would be effective in improving the autonomic balance by studying 22 patients with a first and recent myocardial infarction who were randomly assigned to enter or not enter a 4-week in-hospital physical training program. Spectral indices of heart rate variability were analyzed at rest and during 70 degrees head-up tilt before and after the index training, not training period. As expected, physical training induced a significant increase in exercise duration (13.7 +/- 0.8 vs 17.1 +/- 0.1 min, p less than 0.001) and in the anaerobic threshold (9.5 +/- 0.7 vs 12.0 +/- 1.0 min, p less than 0.02) in trained patients, while no changes were observed in the untrained group. At entry, in both groups, spectral profile of heart rate variability was characterized by a predominant LF component and a smaller HF component with no further modification after head-up tilt. After 4 weeks, in resting conditions, no significant changes in spectral components were observed in both trained and untrained patients. After physical training, head-up tilt produced significant modifications in spectral profile with an increase in the LF component (84 +/- 3 vs 69 +/- 5 nu, p less than 0.01) and a decrease in the HF component (7 +/- 1 vs 19 +/- 4 nu, p less than 0.05) in trained patients, while no changes were observed in the untrained patients. Our data suggest that in postmyocardial infarction patients, 4 weeks of physical training may induce an improvement in the autonomic balance with a restoration toward normal in the reflex activity of the system. |
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Authors:
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M T La Rovere; A Mortara; G Sandrone; F Lombardi |
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Publication Detail:
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Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: Chest Volume: 101 ISSN: 0012-3692 ISO Abbreviation: Chest Publication Date: 1992 May |
Date Detail:
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Created Date: 1992-06-11 Completed Date: 1992-06-11 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0231335 Medline TA: Chest Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 299S-303S Citation Subset: AIM; IM; S |
Affiliation:
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Divisione di Cardiologia, Centro Medico Montescano, IRCCS, Pavia, Italy. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological
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physiology* Adult Autonomic Nervous System / physiopathology* Electrocardiography, Ambulatory / methods Exercise Test / methods Exercise Therapy* / methods Heart Rate / physiology Humans Male Middle Aged Myocardial Infarction / physiopathology, rehabilitation Posture / physiology Rest / physiology Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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