Format

Send to

Choose Destination
See comment in PubMed Commons below
Am J Physiol Heart Circ Physiol. 2006 Jul;291(1):H121-6. Epub 2006 Feb 3.

Influence of sex and active muscle mass on renal vascular responses during static exercise.

Author information

  • 1Division of Cardiology, Department of Medicine, Pennsylvania State University College of Medicine, Milton S. Hershey Medical Center, PA 17033, USA.

Abstract

During exercise, reflex renal vasoconstriction helps maintain blood pressure and redistributes blood flow to the contracting muscle. Sex and muscle mass have been shown to influence certain cardiovascular responses to exercise. Whether sex and/or muscle mass influence renal vasoconstrictor responses to exercise is unknown. We studied healthy men (n = 10) and women (n = 10) matched for age and body mass index during handgrip (HG, small muscle mass) and quadriceps contraction (QC, large muscle mass) as beat-to-beat changes in renal blood flow velocity (RBV; duplex ultrasound), mean arterial pressure (MAP; Finapres), and heart rate (ECG) were monitored. Renal vascular resistance (RVR) index was calculated as MAP / RBV. Responses to HG vs. QC were compared in 13 subjects. We found that 1) RVR responses to short (15-s) bouts and fatiguing HG were similar in men and women (change in RVR during 15-s HG at 70% of maximum voluntary contraction = 23 +/- 4 and 31 +/- 4% in men and women, respectively, P = not significant); 2) post-HG circulatory responses were similar in men and women; and 3) HG and QC were similar during short (15-s) bouts (change in RVR during HG at 50% of maximum voluntary contraction = 19 +/- 3 and 18 +/- 5% for arm and leg, respectively, P = not significant). Our findings suggest that muscle reflex-mediated renal vasoconstriction is similar in men and women during static exercise. Moreover, muscle mass does not contribute to the magnitude of the reflex renal vasoconstrictor response seen with muscle contraction.

[PubMed - indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk