Muscle strength and pressor response
Deutscher übersetzter Titel: | Muskelkraft und Resonanz auf Druckbelastung |
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Autor: | Gonzales, J.U.; Thompson, B.C.; Thistlethwaite, J.R.; Harper, A.J.; Scheuermann, B.W. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 30 (2009), 5, S. 320-324, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-0028-1111109 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU200907003375 |
Quelle: | BISp |
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). 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) 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•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•100 ml/kg, 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. Verf.-Referat