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DOI: 10.1055/s-0028-1111109
© Georg Thieme Verlag KG Stuttgart · New York
Muscle Strength and Pressor Response
Publication History
accepted after revision October 6, 2008
Publication Date:
06 February 2009 (online)
Abstract
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·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·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·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·min−1·100 ml−1·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.
Key words
muscle blood flow - handgrip - vascular conductance
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Correspondence
Dr. J. U. GonzalesPhD
Department of Kinesiology
Pennsylvania State University
226 Noll Laboratory
University Park
16802 United States
Phone: +814/865/12 35
Fax: +814/865/46 02
Email: jug18@psu.edu