| Autonomic control of heart rate during physical exercise and fractal dimension of heart rate variability. | |
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MedLine Citation:
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PMID: 8458809 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The objectives of the present study were to investigate autonomic nervous system influence on heart rate during physical exercise and to examine the relationship between the fractal component in heart rate variability (HRV) and the system's response. Ten subjects performed incremental exercise on a cycle ergometer, consisting of a 5-min warm-up period followed by a ramp protocol, with work rate increasing at a rate of 2.0 W/min until exhaustion. During exercise, alveolar gas exchange, plasma norepinephrine (NE) and epinephrine (E) responses, and beat-to-beat HRV were monitored. HRV data were analyzed by "coarse-graining spectral analysis" (Y. Yamamoto and R. L. Hughson. J. Appl. Physiol. 71: 1143-1150, 1991) to break down their total power (Pt) into harmonic and nonharmonic (fractal) components. The harmonic component was further divided into low-frequency (0.0-0.15 Hz) and high-frequency (0.15-0.8 Hz) components, from which low-frequency and high-frequency power (Pl and Ph, respectively) were calculated. Parasympathetic (PNS) and sympathetic (SNS) nervous system activity indicators were evaluated by Ph/Pt and Pl/Ph, respectively. From the fractal component, the fractal dimension (DF) and the spectral exponent (beta) were calculated. The PNS indicator decreased significantly (P < 0.05) when exercise intensity exceeded 50% of peak oxygen uptake (VO2 peak). Conversely, the SNS indicator initially increased at 50-60% VO2peak (P < 0.05) and further increased significantly (P < 0.05) at > 60% VO2peak when there were also more pronounced increases in NE and E.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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Y Nakamura; Y Yamamoto; I Muraoka |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 74 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 1993 Feb |
Date Detail:
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Created Date: 1993-04-27 Completed Date: 1993-04-27 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 875-81 Citation Subset: IM |
Affiliation:
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Department of Sports Sciences, Waseda University, Saitama, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Autonomic Nervous System / physiology* Catecholamines / blood, metabolism Electrocardiography Exercise / physiology* Exercise Test Female Heart Rate / physiology* Humans Lactates / blood Lactic Acid Male Oxygen Consumption Parasympathetic Nervous System / physiology Sympathetic Nervous System / physiology |
| Chemical | |
Reg. No./Substance:
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0/Catecholamines; 0/Lactates; 50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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