| Altered hemodynamic regulation and reflex control during exercise and recovery in obese boys. | |
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MedLine Citation:
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PMID: 20952664 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The aims of the present study were to assess in obese and lean boys 1) the hemodynamic responses and baroreflex sensitivity (BRS) to isometric handgrip exercise (HG) and recovery and 2) the muscle metaboreflex-induced blood pressure response and the variables that determine this response. Twenty-seven boys (14 obese and 13 lean boys, body mass index: 29.2 ± 0.9 vs. 18.9 ± 0.3 kg/m(2), respectively) participated. The testing protocol involved 3 min of baseline, 3 min of HG (30% maximum voluntary contraction), 3 min of circulatory occlusion, and 3 min of recovery. The same protocol was repeated without occlusion. At baseline, no differences were detected between groups in beat-to-beat arterial pressure (AP), heart rate (HR), and BRS; however, obese boys had higher stroke volume and lower total peripheral resistance than lean boys (P < 0.05). During HG, lean boys exhibited higher HR and lower BRS compared with their obese counterparts. In lean boys, BRS decreased during HG compared with baseline, whereas in obese boys, it was not significantly modified. In lean boys, TPR was elevated during HG and declined after exercise, whereas in obese boys, TPR did not significantly decrease after exercise cessation. In the postexercise period, BRS in lean boys returned to baseline, whereas an overshoot was observed in obese boys. Postexercise BRS was correlated with body mass index (R = 0.56, P < 0.05). Although the metaboreflex-induced increase in AP was similar between obese and lean children, it was achieved via different mechanisms: in lean children, total peripheral resistance was the main contributor to AP maintenance during the metaboreflex, whereas in obese children, stroke volume significantly contributed to AP maintenance during the metaboreflex. In conclusion, obese normotensive children demonstrated altered cardiovascular hemodynamics and reflex control during exercise and recovery. |
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Authors:
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K Dipla; A Zafeiridis; I Koidou; N Geladas; I S Vrabas |
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Publication Detail:
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Type: Comparative Study; Journal Article Date: 2010-10-15 |
Journal Detail:
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Title: American journal of physiology. Heart and circulatory physiology Volume: 299 ISSN: 1522-1539 ISO Abbreviation: Am. J. Physiol. Heart Circ. Physiol. Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-12-03 Completed Date: 2011-01-13 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100901228 Medline TA: Am J Physiol Heart Circ Physiol Country: United States |
Other Details:
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Languages: eng Pagination: H2090-6 Citation Subset: IM |
Affiliation:
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Exercise Physiology and Biochemistry Laboratory, Department of Physical Education and Sport Sciences at Serres, Aristotle University of Thessaloniki, Serres, Greece. kdipla@phed-sr.auth.gr |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Baroreflex* Blood Pressure Body Mass Index Child Exercise* Greece Hand Strength Heart Rate Hemodynamics* Humans Isometric Contraction* Male Muscle, Skeletal / innervation*, metabolism Obesity / physiopathology* Recovery of Function Reflex, Abnormal* Stroke Volume Thinness / physiopathology* Time Factors Vascular Resistance |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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