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Abstract:
Forty-seven elderly men engaged in regular and vigorous exercise had significantly lower plasma insulin levels during oral glucose tolerance tests than their controls. Pasma-glucose and growth-hormone levels showed no difference. However, when the glucose tolerance test was extended to four hours follow up, for which 19 subjects of each group volunteered, the control subjects showed a blunted post-suppression recovery of growth-hormone secretion in comparison to the athletic group. This difference could be explained by differences in hypothalamic control of the pituitary.