Document Detail


Wave reflection and central aortic pressure are increased in response to static and dynamic muscle contraction at comparable workloads.
MedLine Citation:
PMID:  18079263     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We determined the effects of static and dynamic muscle contraction at equivalent workloads on central aortic pressure and wave reflection. At random, 14 healthy men and women (23 +/- 5 yr of age) performed a static handgrip forearm contraction [90 s at 30% of maximal voluntary contraction (MVC)], dynamic handgrip contractions (1 contraction/s for 180 s at 30% MVC), and a control trial. During static and dynamic trials, tension-time index was controlled by holding peak tension constant. Measurements of brachial artery blood pressure and the synthesis of a central aortic pressure waveform (by radial artery applanation tonometry and generalized transfer function) were conducted at baseline, during each trial, and during 1 min of postexercise ischemia (PEI). Aortic augmentation index (AI), an index of wave reflection, was calculated from the aortic pressure waveform. AI increased during both static and dynamic trials (static, 5.2 +/- 3.1 to 11.8 +/- 3.4%; dynamic, 5.8 +/- 3.0 to 13.3 +/- 3.4%; P < 0.05) and further increased during PEI (static, 18.5 +/- 3.1%; dynamic, 18.6 +/- 2.9%; P < 0.05). Peripheral and central systolic and diastolic pressures increased (P < 0.05) during both static and dynamic trials and remained elevated during PEI. AI and pressure responses did not differ between static and dynamic trials. Peripheral and central pressures increased similarly during static and dynamic contraction; however, the rise in central systolic pressure during both conditions was augmented by increased wave reflection. The present data suggest that wave reflection is an important determinant of the central blood pressure response during forearm muscle contractions.
Authors:
David G Edwards; Corey R Mastin; Robert W Kenefick
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Publication Detail:
Type:  Journal Article     Date:  2007-12-13
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  104     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-02-11     Completed Date:  2008-04-04     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  439-45     Citation Subset:  IM    
Affiliation:
Dept. of Health, Nutrition, and Exercise Sciences, 541 South College Ave., 142 HPL, Newark, DE 19716, USA. dge@udel.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
Aorta / physiology*
Blood Pressure*
Brachial Artery / physiology
Diastole
Female
Forearm
Hand Strength*
Heart Rate
Humans
Male
Muscle Contraction*
Muscle, Skeletal / physiology*
Radial Artery / physiology
Systole
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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