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Selenium balance studies in apparently healthy and housebound elderly people eating self-selected diets

Published online by Cambridge University Press:  09 March 2007

Valda W. Bunker ,
Margaret S. Lawson ,
Maureen F. Stansfield  and
Barbara E. Clayton
Valda W. Bunker
Affiliation:
Chemical Pathology and Human Metabolism,Level D, South Laboratory Block, Southampton General Hospital, Southampton SO9 4XY
Margaret S. Lawson
Affiliation:
Department of Applied Chemistry and Life Sciences, The Polytechnic of North London, LondonN8 7DB
Maureen F. Stansfield
Affiliation:
Geriatric Medicine, Medical Faculty of the University of Southampton, Level D, South Laboratory Block, Southampton General Hospital, Southampton SO9 4XY
Barbara E. Clayton
Affiliation:
Chemical Pathology and Human Metabolism,Level D, South Laboratory Block, Southampton General Hospital, Southampton SO9 4XY
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Abstract

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1. Metabolic balance studies (5 d) for Se were conducted in twenty-four apparently healthy elderly people (age 69·6–85·4 years), and twenty housebound subjects (age 69·9–85·1 years) with chronic disease. During the study the subjects lived in their own homes, ate self-selected diets and continued their normal daily activities.

2. Geometric mean daily dietary intakes of the two groups were significantly different (P < 0·01), being 819 (range 310–1631) nmol for the healthy and 475 (range 233–1136) nmol for the housebound elderly.

3. Daily intake of Se significantly correlated with balance in both groups. Solution of the regression equations gave theoretical daily requirements of 447 nmol for the healthy and 419 nmol for the housebound subjects. The healthy elderly were in positive balance of 148 nmol/d for Se and the housebound were in equilibrium with an overall mean retention of 43 nmol/d.

4. Mean levels of Se in blood fractions for the healthy and housebound subjects were significantly different, being 1·65 and 1·40 μmol/l whole blood, 1·45 and 1·21 μmol/l plasma and 5·72 and 5·30 nmol/g haemoglobin in erythrocytes respectively. There was no difference in the whole-blood glutathione peroxidase (EC 1.11.1.9) activities between the two groups.

5. There were clear differences in Se status between the two groups of elderly people. The cause of the positive balance in the healthy subjects remains unexplained.

Type
Clinical and Human Nutrition Papers Studies in Man
Information
British Journal of Nutrition , Volume 59 , Issue 2 , March 1988 , pp. 171 - 180
Copyright
Copyright © The Nutrition Society 1988

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