PMID: 15235318Jul 6, 2004Paper

Muscle contraction-induced limb blood flow variability during dynamic knee extensor

Medicine and Science in Sports and Exercise
Takuya Osada

Abstract

To evaluate whether muscle contraction-induced variability of limb femoral arterial blood flow (FABF) can be reduced with longer sampling durations. This was assessed in relation to muscle contraction-relaxation cycles (CRcycles) during steady-state, one-legged, dynamic knee-extensor exercise (KEE) at varying "exercise intensities" and "contraction frequencies." Eleven male subjects performed steady-state KEE at 10-40 W at 30 and 60 contractions per minute (cpm). FABF (Doppler ultrasound) and contraction-relaxation-induced variability in FABF was determined for 1-, 2-, 5-, 10-, 15-, 20-, and 30-CRcycles during approximately 4-min steady-state KEE. Variability was determined as coefficients of variation (CV). During KEE at 30 and 60 cpm CVFABF was significantly higher for 1-CRcycles (12.3% and 15.5%) and 2-CRcycles (9.6% and 11.8%) than for 30-CRcycles (4.0% and 5.2%), but similar for 10-CRcycles to 30-CRcycles at all work rates and contraction frequencies. The CVFABF between work rates at 30 and 60 cpm did not statistically differ (P = NS) for any of the CRcycle measurements. However, the single CRcycles-induced CVFABF at 60 cpm was significantly higher (P < 0.05) than that at 30 cpm at the lower exercise intensities of 10 and ...Continue Reading

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Citations

Oct 3, 2007·European Journal of Applied Physiology·William P S McKayBrian L F Daku
Jun 3, 2009·Clinical Physiology and Functional Imaging·Takuya Osada, Göran Rådegran
Jul 11, 2006·Medicine and Science in Sports and Exercise·Guillaume WaltherPhilippe Obert
Jul 15, 2006·The Journal of Physiological Sciences : JPS·Takuya Osada, Göran Rådegran
Oct 5, 2006·Medicine and Science in Sports and Exercise·Michael E TschakovskyDenis E O'Donnell
Feb 1, 2011·Medical Science Monitor : International Medical Journal of Experimental and Clinical Research·Takuya OsadaToshihito Katsumura

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