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AJP - Endocrinology and Metabolism, Vol 266, Issue 4 E540-E547, Copyright © 1994 by American Physiological Society
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J. W. Kemnitz, E. B. Roecker, R. Weindruch, D. F. Elson, S. T. Baum and R. N. Bergman
Department of Medicine, University of Wisconsin, Madison 53715.
Insulin sensitivity and glucose tolerance typically decline during later life. In a multidimensional randomized trial of the effects of dietary restriction started in adulthood on the processes of aging, we are studying insulin sensitivity and glucoregulation longitudinally in control (C, n = 15, fed a defined diet ad libitum for 6-8 h/day) and restricted (R, n = 15, fed 30% less than C) monkeys using the Modified Minimal Model method. Linear rates of change were calculated for individual animals through 30 mo of diet treatment and compared between treatment groups. Basal glucose, basal insulin, and insulin responses to glucose and tolbutamide increased for C and decreased for R animals (P < or = 0.002), whereas insulin sensitivity decreased for C and increased for R (P = 0.008). Glycosylated hemoglobin at 30 mo was marginally lower in R (P = 0.06) and was positively correlated with fasting plasma glucose (r = 0.508, P < 0.001). Insulin changes were significantly correlated with changes in adiposity (weight and abdominal circumference). Identification of the mechanisms through which these effects are achieved may aid in ameliorating glucose intolerance, insulin resistance, and associated illnesses in older persons.
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