Key result
Reducing hindlimb blood flow decreases renal vascular conductance independent of sympathetic nerve activity.
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Indicates non-neural renal vasoconstriction during chemoreflex; leaves open mechanisms and relevance in human exercise physiology.
The purpose of this study was to investigate the effects of the muscle chemoreflex on vascular conductance in innervated and denervated kidneys. During each experiment, six dogs ran at 10 km/h for 8-16 min, and the muscle chemoreflex was stimulated by reducing hindlimb blood flow (HLBF) (0%-74%) at 4-min intervals. Small reductions in HLBF did not cause changes in arterial blood pressure or renal vascular conductance. However, further reductions of HLBF caused increases in arterial blood pressure and decreases in renal vascular conductance. Decreases in renal vascular conductance occurred in the denervated kidneys when the HLBF was reduced below 1,500 +/- 215 ml/min and occurred in the innervated kidneys when HLBF was reduced below 1,402 +/- 161 ml/min. There was not a significant difference between the reductions in HLBF required to cause a decrease in vascular conductance in the innervated and denervated kidneys. These results demonstrate that reductions in HLBF cause decreases in renal vascular conductance, which are not dependent on renal sympathetic nerve activity.
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Mittelstadt et al. (1996) studied this question. Reducing hindlimb blood flow (HLBF) vs. Baseline or small reductions in HLBF was evaluated on Renal vascular conductance. Reducing hindlimb blood flow below 1,500 +/- 215 ml/min in denervated kidneys and 1,402 +/- 161 ml/min in innervated kidneys caused decreases in renal vascular conductance independent of sympathetic nerve activity.
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