| Isometric handgrip exercise improves acute neurocardiac regulation. | |
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MedLine Citation:
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PMID: 19680681 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Isometric handgrip (IHG) training (>6 weeks) has been shown to reduce resting arterial blood pressure (ABP) and improve cardiac autonomic modulation. However, the effects of a single bout of IHG on acute neurocardiac regulation remain unknown. The purpose of this study was to examine the effect of IHG exercise on nonlinear heart rate dynamics and cardiac vagal activity. Nonlinear dynamics were assessed by sample entropy, detrended fluctuation analysis (alpha(1)), and correlation dimension techniques. The 4-second exercise test was used to calculate the cardiac vagal index (CVI), an indirect measure of cardiac vagal activity. In a randomized crossover design, 18 older (70 +/- 5 years of age) subjects completed IHG exercise (four 2-min isometric contractions at 30% MVC) and a time-matched control condition. Following a single bout of bilateral IHG, there was a small reduction in systolic blood pressure (125 +/- 2 to 122 +/- 1 mmHg, P < 0.01), in addition to, a significant decrease in alpha(1) (1.42 +/- 0.12 to 1.22 +/- 0.10, P < 0.05), an increase in sample entropy (1.28 +/- 0.03 to 1.40 +/- 0.05, P < 0.001), and an increase in the CVI (1.24 +/- 0.03 to 1.29 +/- 0.03, P < 0.01). These results suggest improvements in acute cardiac autonomic modulation following a single bout of IHG. This may be mechanistically linked to the observed reductions in ABP seen in previous IHG training studies. Alternatively, these acute effects may have clinical applications and require further investigation. |
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Authors:
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Philip J Millar; Maureen J MacDonald; Steven R Bray; Neil McCartney |
Publication Detail:
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Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't Date: 2009-08-13 |
Journal Detail:
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Title: European journal of applied physiology Volume: 107 ISSN: 1439-6327 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2009 Nov |
Date Detail:
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Created Date: 2009-10-27 Completed Date: 2010-02-05 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 509-15 Citation Subset: IM |
Affiliation:
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Department of Kinesiology, McMaster University, 1280 Main St W, Hamilton, ON L8S 4K1, Canada. millarpj@mcmaster.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Autonomic Nervous System / physiology* Blood Pressure / physiology Cardiovascular Physiological Phenomena Cross-Over Studies Exercise / physiology* Female Hand / physiology* Hand Strength / physiology* Heart / innervation, physiology* Heart Rate / physiology Humans Male Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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