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  • Title: Renal sympathetic nerve activity and plasma catecholamines during eating in cats.
    Author: Matsukawa K, Honda T, Ninomiya I.
    Journal: Am J Physiol; 1989 Nov; 257(5 Pt 2):R1034-9. PubMed ID: 2589529.
    Abstract:
    We measured renal sympathetic nerve activity (RNA) and arterial plasma concentration of norepinephrine (NE) and epinephrine (EPI) before, during, and after eating in six conscious cats. Eating continued for a period of 5 min. RNA, heart rate (HR), and arterial blood pressure (AP) increased almost simultaneously with the onset of eating and reached a maximum value of 192%, 221 beats/min, and 121 mmHg at 2.5-5 min after the onset of eating, respectively. The plasma NE level increased significantly (P less than 0.05) during eating from the control value of 0.56 ng/ml and reached a maximum value of 1.33 ng/ml at 4.5-5 min, whereas the plasma EPI level did not change significantly from the control value of 0.12 ng/ml. The plasma levels of NE and EPI were unaffected by the blood samplings. The relationship between the changes in RNA and the plasma NE level during eating had a significant (P less than 0.05) positive correlation (r = 0.52). The result suggests that plasma NE concentration tends to increase with the rise in RNA during eating.
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