1. Astrand I (1960) Aerobic work capacity in men and women with special reference to age. Acta Physiol Scand 49(Suppl 169):1–92
2. Berg KO, Maki BE, Williams JI, Holliday PJ, Wood-Dauphinee SL (1992) Clinical and laboratory measures of postural balance in an elderly population. Arch Phys Med Rehabil 73:1073–1080
3. Borg GA (1982) Psychophysical bases of perceived exertion. Med Sci Sports Exerc 14:377–381
4. Buskirk ER, Hodgson JL (1987) Age and aerobic power: the rate of change in men and women. Fed Proc 46:1824–1829
5. Cicoira M, Davos CH, Florea V, Shamim W, Doehner W, Coats AJ, Anker SD (2001) Chronic heart failure in the very elderly: clinical status, survival, and prognostic factors in 188 patients more than 70 years old. Am Heart J 142:174–180