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229 results on '"Christensen, N.J."'

1. Splenectomy impairs lymphocytosis during maximal exercise

Author

Nielsen, H.B., Secher, N.H., Kristensen, J.H., Christensen, N.J., Espersen, K., and Pedersen, B.K.

Subjects
Spleen -- Physiological aspects, Lymphocytes -- Physiological aspects, Killer cells -- Physiological aspects, Exercise -- Physiological aspects, Biological sciences
Abstract

The lymphocyte cell counts of splenectomized subjects were analyzed during maximal exercise to characterize the role of the spleen in lymphocytosis and elevated natural killer (NK) cell activity. Splenectomized subjects exhibited impaired elevations in NK cells and T lymphocytes during exercise compared to non-splenoctomized subjects. Furthermore, lowered increase of NK cells during exercise in splenectomized subjects was not related to the activation of the sympathetic nervous system.

Published
1997

2. Increased cerebral blood flow and plasma epinephrine in hypoglycemic, preterm neonates

Author

Pryds, O., Christensen, N.J., and Friis-Hansen, B.

Subjects
Blood flow -- Measurement, Hypoglycemia, Epinephrine -- Physiological aspects, Regional blood flow -- Laws, regulations and rules, Infants (Premature) -- Physiological aspects
Abstract

The typical signs and symptoms of low blood sugar (hypoglycemia) that occur in adults are not observed in infants with the condition who have been born prematurely, before about the 30th week of pregnancy. Glucose, a simple sugar, is essential for normal brain functioning. Glucose is mobilized by the substances glucagon and epinephrine (synonymous with adrenaline) in response to low blood glucose levels. In preterm infants, it appears that there is an additional mechanism that compensates for low blood glucose. It is thought that epinephrine increases the blood flow to tissues in the brain. To see how preterm infants respond to low blood sugar, cerebral blood flow and levels of the hormones epinephrine and norepinephrine levels were measured in 25 preterm infants. When glucose levels were low, the cerebral blood flow and epinephrine increased, while norepinephrine remained the same. Hypoglycemia, which was diagnosed in 13 infants, was treated with intravenous glucose and milk. The remaining 12 infants with normal blood glucose were given just milk. Thirty minutes later, the cerebral blood flow in the hypoglycemic infants decreased by 11.3 percent, but was still 37.5 percent higher than in normal infants, despite normal epinephrine levels. Regulatory mechanisms are summoned when blood glucose levels are low (less than 30 to 45 mg) and epinephrine may play a role in causing an increased cerebral blood flow. (Consumer Summary produced by Reliance Medical Information, Inc.)

Published
1990

18. Forearm vascular and neuroendocrine responses to graded water immersion in humans

Author

Gabrielsen, A., Videbaek, Regitze, Johansen, L.B., Warberg, Jørgen, Christensen, N.J., Pump, Bettina, Norsk, P., Gabrielsen, A., Videbaek, Regitze, Johansen, L.B., Warberg, Jørgen, Christensen, N.J., Pump, Bettina, and Norsk, P.

Abstract

arginine vasopressin, blood pressure, forearm blood flow, renin-angiotensin system, sympathetic nervous system

Published
2000

39. Localization of thermogenesis induces by single infusion of ephedrine in dog

Author

Madsen, J., Bülow, J., Larsen, O.G., Hartkopp, A., Nielsen, N.E., Astrup, A., Christensen, N.J., Madsen, J., Bülow, J., Larsen, O.G., Hartkopp, A., Nielsen, N.E., Astrup, A., and Christensen, N.J.

Abstract

Fysiologi, stofskifte, efedrin, hund, skeletmuskel, hjerte, lever

Published
1993

48. Renal function in patients with untreated acute myocardial infarction

Author

Abildgaard, U., Andersen, J.S., Daugaard, G., Aldershvile, Jan, Nielsen, S.L., Christensen, N.J., Leyssac, Paul P., Abildgaard, U., Andersen, J.S., Daugaard, G., Aldershvile, Jan, Nielsen, S.L., Christensen, N.J., and Leyssac, Paul P.

Abstract

Fysiologi

Published
1992

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