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As Dr. Greenblatt states in the Introduction, old age has always been with us; there is only more of it now. Some 20 million Americans, or 10% of the population, have reached the age of retirement, with its unique social and physiologic problems. When studying the physiologic alterations produced by aging, it is usually impossible to differentiate between the efficient performance of young and old organs while at rest and not under stress. Nevertheless, the reserve capacity of many body systems becomes impaired with age, and the tests that have been developed are usually aimed at detecting such deficiencies by
Geriatric Endocrinology.. Ann Intern Med. 1978;89:584. doi: https://doi.org/10.7326/0003-4819-89-4-584_2
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Published: Ann Intern Med. 1978;89(4):584.
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