Abstract des Autors

Master athletes are often considered to represent the ideal rate of decline of aerobic function; however, most of the studies interested in active elderly people are often limited to people younger than 75. We aimed to determine the physiological adaptations and aerobic fitness in a selected European population of active octogenarians during maximal and submaximal exercise tests. Aerobic capacity was measured during maximal incremental tests on treadmill (TR) and cycle-ergometer (CE) and functional capacity during a 6-minute walk test (6-MWT) in 17 subjects aged 81.2 ± 0.8 years. Pulmonary gas exchange and heart rate (HR) were continuously measured during the different exercise tests. Maximal oxygen consumption (VO2max) on TR and CE was significantly higher than predicted values (TR: 28.7 ± 1.2 vs. 17 ± 0.5 ml/kg/min; CE: 23 ± 1.2 vs. 16 ± 0.6 ml/kg/min for measured and predicted values respectively). VO2max and HRmax, as well as VO2 and HR at the ventilatory threshold (VO2TVE and HR TVE) were significantly higher on TR than on CE (HRmax: 144 ± 4 vs. 138 ± 4 bpm; VO2TVE: 22.5 ± 0.8 vs. 17.7 ± 0.9 ml/kg/min for TR and CE respectively). VO2TVE and HR TVE on TR were equivalent to VO2 and HR measured during the 6-MWT. HR TVE on TR and mean HR during the 6-MWT were strongly correlated (R=0.82, p<0.01). Maintenance of regular physical activity provides high aerobic fitness, in octogenarians, as was shown by the higher values of our subjects in comparison to predicted values. Moreover, the close relation between the intensity developed at TVE on TR and 6-MWT could support the idea that a walk test is a submaximal test performed at high intensity that could provide a basis for exercise prescription in an individualized manner in active elderly people. Verf.-Referat