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Follow-up study on the relationship of dietary, environmental, and biochemical factors to bone density in a population of elderly men and women
Doolan, Linda Sue
Doolan, Linda Sue
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Abstract
The purpose of this study was to investigate whether the relationship of dietary, environmental, and biochemical factors to bone density changed over a four year period in a group of normal healthy elderly residents in southeast Kansas. Fifteen of thirty-five male and sixteen of twenty-nine female volunteers between the ages of 67 and 88 who participated in two previous studies completed the study.
Dietary intakes of calcium, phosphorus, ratio, vitamins D and C, animal and vegetable protein, and calories were determined using the Missouri Nutrition Survey. Amount of sunlight exposure and physical activity were determined by questionnaire. Bone density was measured by photon absorption with a bone densitometer. Serum levels of calcium, 25-hydroxyvitamin D, and parathyroid hormone were measured.
Mean dietary intake of calcium, vitamin D, and animal and vegetable protein decreased considerably in the men. Less change in dietary intake was found in the women except for a sizeable increase in intake of vitamins D and C. Mean sunlight exposure and bone density decreased for both men and women; physical activity decreased in the women. Stepwise multiple regression analysis demonstrated a significant relationship between a lower sunlight exposure, higher serum calcium level, and higher calcium intake with a higher bone density in the men; and between a younger age and higher vitamin C intake with a higher bone density in the women. A regression analysis of the change in values for the factors studied predicted that women who consumed less vegetable protein and engaged in less physical activity had less of a decrease in bone density; no significant associations were found in the men.
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M.S. University of Kansas, Dietetics and Nutrition 1984
Date
1984-05-31
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University of Kansas
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doolan_1984_916253.pdf
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