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2. American College of Sports Medicine. (1986). Guidelines for exercise testing and perception, (3rd ed.). Philadelphia: Lea & Febiger.
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4. Atchley, R. C. (1999). Continuity and adaptation in aging: Continuity and adaptation: creating positive experiences. Baltimore: The Johns Hopkins University Press.
5. What do 70-year-old men and women actually do? And what are they able to do? From the Glostrup survey in 1984;Avlund;Aging. Clinical and Experimental Research,1991