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American Journal of Clinical Nutrition, Vol 41, 1023-1031, Copyright © 1985 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Urinary excretion of selenium by New Zealand and North American human subjects on differing intakes

JR Robinson, MF Robinson, OA Levander and CD Thomson

Lower renal plasma clearances of selenium (CSe 0.1-0.2 ml min-1), indicating excretion of a smaller proportion of Se presented to the kidneys, were found in New Zealand (NZ) residents with low plasma Se ((Se)p 50-70 ng ml-1) on customary intakes below 30 micrograms d-1 Se. North American subjects consuming 80 micrograms d-1 with (Se)p 120-140 ng ml-1 had CSe between 0.2 and 0.3 ml min-1. Several weeks' supplementation with high-Se bread increased NZ subjects' (Se)p to 120- 175 ng ml-1 and CSe to 0.4-0.7 ml min-1. (Se)p remained elevated when supplementation ceased, but CSe returned to the basal range within a few days. Americans' clearances showed no such abrupt decrease when their dietary intake was similarly reduced. The NZ residents thus appeared to excrete selenium more sparingly than others. Rapid alterations in clearance after supplements and single doses were probably due to changes in the proportions of different forms of selenium in the plasma.


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A. J Duffield, C. D Thomson, K. E Hill, and S. Williams
An estimation of selenium requirements for New Zealanders
Am. J. Clinical Nutrition, November 1, 1999; 70(5): 896 - 903.
[Abstract] [Full Text] [PDF]


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