In Vivo Patterns of Circulating Steroids in Adult Male Rats III. Effect of Total Parenteral Nutrition on the Diurnal Variation of Testosterone

R. J. Keating Department of Reproductive Medicine and Biology, The University of Texas Medical School at Houston, Houston, Texas, 77030

R. K. Tcholakian Department of Reproductive Medicine and Biology, The University of Texas Medical School at Houston, Houston, Texas, 77030

Abstract

The in vivo pattern of circulating testosterone (T) during a 24 hr period was investigated in stock-fed and total parenterally nourished (TPN) rats. A diurnal rhythm of T was observed in control rats with highest concentrations occurring during the dark period. The loss of this rhythm in rats maintained on TPN shows that nutritional regimen affects circulating T and overrides the synchronizing effect of the light/dark cycle.

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In Vivo Patterns of Circulating Steroids in Adult Male Rats III. Effect of Total Parenteral Nutrition on the Diurnal Variation of Testosterone

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In Vivo Patterns of Circulating Steroids in Adult Male Rats III. Effect of Total Parenteral Nutrition on the Diurnal Variation of Testosterone

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