TY - JOUR
T1 - Changes in regional vascular resistance and blood volume after hemorrhage in fed and fasted awake rats
AU - Darlington, D. N.
AU - Jones, R. O.
AU - Marzella, L.
AU - Gann, D. S.
PY - 1995
Y1 - 1995
N2 - To determine whether fasting alters the response of blood flow to hemorrhage, blood flow was measured by radiolabeled microspheres before and after a 20 ml · kg-1 · 3 min-1 hemorrhage in fed and fasted chronically cannulated male Sprague-Dawley rats. Restitution of blood volume, as determined by dilution of hematocrit, was attenuated in fasted rats, although the responses of arterial blood pressure, heart rate, cardiac output, and total peripheral resistance were not significantly different. Fasting only affected resting blood flow in the bronchial artery and fat and had no effect on resting vascular resistance in any organ studied. In both fed and fasted rats, hemorrhage led to a significant fall in blood flow to the stomach, small intestine, cecum, colon, spleen, pancreas, kidney, bronchial artery, thymus, and muscle and a rise in blood flow to the adrenals. However, fasting did not significantly alter the response of flow or vascular resistance to these organs. Fasting did alter the blood flow response to hemorrhage in bone, fat, and the hepatic artery. These results demonstrate that 24 h of fasting does not affect the responses of blood flow and vascular resistance to hemorrhage in most organs, even though restitution of blood volume is attenuated.
AB - To determine whether fasting alters the response of blood flow to hemorrhage, blood flow was measured by radiolabeled microspheres before and after a 20 ml · kg-1 · 3 min-1 hemorrhage in fed and fasted chronically cannulated male Sprague-Dawley rats. Restitution of blood volume, as determined by dilution of hematocrit, was attenuated in fasted rats, although the responses of arterial blood pressure, heart rate, cardiac output, and total peripheral resistance were not significantly different. Fasting only affected resting blood flow in the bronchial artery and fat and had no effect on resting vascular resistance in any organ studied. In both fed and fasted rats, hemorrhage led to a significant fall in blood flow to the stomach, small intestine, cecum, colon, spleen, pancreas, kidney, bronchial artery, thymus, and muscle and a rise in blood flow to the adrenals. However, fasting did not significantly alter the response of flow or vascular resistance to these organs. Fasting did alter the blood flow response to hemorrhage in bone, fat, and the hepatic artery. These results demonstrate that 24 h of fasting does not affect the responses of blood flow and vascular resistance to hemorrhage in most organs, even though restitution of blood volume is attenuated.
KW - arterial blood pressure
KW - blood flow
KW - microspheres
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U2 - 10.1152/jappl.1995.78.6.2025
DO - 10.1152/jappl.1995.78.6.2025
M3 - Article
C2 - 7665395
AN - SCOPUS:0029015647
SN - 8750-7587
VL - 78
SP - 2025
EP - 2032
JO - Journal of applied physiology
JF - Journal of applied physiology
IS - 6
ER -