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The circadian rhythms of food and 1% NaCl intake, and urine, Na+, Cl- and K+ excretion were followed up in male Wistar rats before and one week after bilateral adrenalectomy at 4-hour intervals during two consecutive days. The circadian rhythms of plasma renin activity (PRA) and plasma immunoreactive insulin (IRI) were evaluated after decapitation of both intact and adrenalectomized rats at 08, 16 and 24 h. To all rats 1% NaCl was offered instead of drinking water. Adrenalectomy did not cause any significant phase shift in the cosine curves approximating the data collected at 4-hour intervals. The circadian rhythms showed the same relationships before and after the operation: the rhythms of food intake, K+ excretion and saline intake preceded significantly the rhythms of urine, Na+ and Cl- excretion. Adrenalectomy induced an increase in mean PRA and shifted its minimal value from 08 to 24 h. After the operation mean IRI decreased and the minimal value shifted from 16 to 24 h. It was concluded that adrenal glands do not play an important role in the synchronization of the circadian rhythms of food and 1% NaCl intake, urine and synchronization of the circadian rhythms of food and 1% NaCl intake, urine and electrolyte excretion with the illumination cycle, but play a relevant role in the synchronization of the circadian rhythms of PRA and IRI in the rat.
O C Ikonomov, and
A G Stoynev, and
N C Vrabchev, and
A C Shisheva, and
N T Tarkolev
October 1993,
Physiology & behavior,
O C Ikonomov, and
A G Stoynev, and
N C Vrabchev, and
A C Shisheva, and
N T Tarkolev
September 1986,
The American journal of physiology,
O C Ikonomov, and
A G Stoynev, and
N C Vrabchev, and
A C Shisheva, and
N T Tarkolev
February 1990,
Biulleten' eksperimental'noi biologii i meditsiny,
O C Ikonomov, and
A G Stoynev, and
N C Vrabchev, and
A C Shisheva, and
N T Tarkolev
December 1980,
Life sciences,
O C Ikonomov, and
A G Stoynev, and
N C Vrabchev, and
A C Shisheva, and
N T Tarkolev
May 1985,
Acta paediatrica Scandinavica,
O C Ikonomov, and
A G Stoynev, and
N C Vrabchev, and
A C Shisheva, and
N T Tarkolev
November 1991,
Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme,
O C Ikonomov, and
A G Stoynev, and
N C Vrabchev, and
A C Shisheva, and
N T Tarkolev
December 1985,
Behavioral neuroscience,
O C Ikonomov, and
A G Stoynev, and
N C Vrabchev, and
A C Shisheva, and
N T Tarkolev
January 1982,
Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.),
O C Ikonomov, and
A G Stoynev, and
N C Vrabchev, and
A C Shisheva, and
N T Tarkolev
January 1979,
Hypertension (Dallas, Tex. : 1979),
O C Ikonomov, and
A G Stoynev, and
N C Vrabchev, and
A C Shisheva, and
N T Tarkolev
December 1995,
Obesity research,
