Document Detail

Muscle strength and pressor response.
MedLine Citation:
PMID:  19199216     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to determine if muscle strength influences the hyperemic response to dynamic exercise. Men with low (n=8) and high (n=9) maximal forearm strength performed dynamic handgrip exercise as the same absolute workload increased in a ramp function (0.5 kg x min (-1)). Forearm blood flow (FBF) was measured instantaneously by ultrasound Doppler and blood pressure was measured by auscultation. The pressor response to exercise was greater (P<0.05) for low strength men at workloads >1.5 kg allowing volumetric FBF (ml x min (-1)) and vascular conductance to increase in proportion to absolute workload similar to high strength men. When FBF was expressed relative to forearm volume (ml x min (-1).100 ml (-1)) the hyperemic response to exercise (slope of relative FBF vs. workload) was greater in low strength men (3.2+/-1.5 vs. 1.7+/-0.4 ml x min (-1).100 ml (-1) x kg (-1), P<0.05) as was relative FBF at workloads >1.5 kg. However, when relative FBF was compared across relative work intensity, no difference was found between low and high strength groups. Together, these findings suggest men with low strength require a greater pressor response to match blood flow to exercise intensity as compared to high strength men.
J U Gonzales; B C Thompson; J R Thistlethwaite; A J Harper; B W Scheuermann
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Publication Detail:
Type:  Journal Article     Date:  2009-02-06
Journal Detail:
Title:  International journal of sports medicine     Volume:  30     ISSN:  1439-3964     ISO Abbreviation:  Int J Sports Med     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-04-29     Completed Date:  2009-07-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  320-4     Citation Subset:  IM    
Department of Kinesiology, Pennsylvania State University, University Park 16802, United States.
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MeSH Terms
Blood Pressure*
Exercise Test
Forearm / blood supply,  physiology
Hyperemia / metabolism
Muscle Contraction / physiology*
Muscle Strength / physiology*
Ultrasonography, Doppler
Young Adult

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