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1 Canadian Centre for Activity and Aging, London, Ontario, Canada; School of Kinesiology, The University of Western Ontario, London, Ontario, Canada
2 Canadian Centre for Activity and Aging, London, Ontario, Canada; School of Nutrition and Dietetics, Acadia University, Wolfville, Nova Scotia, Canada
3 Canadian Centre for Activity and Aging, London, Ontario, Canada; School of Kinesiology, The University of Western Ontario, London, Ontario, Canada; School of Kinesiology, The University of Western Ontario, London, Ontario, Canada
* To whom correspondence should be addressed. E-mail: dpaterso{at}uwo.ca.
The purpose was to describe the longitudinal (10y) decline in aerobic power (VO2max) and anaerobic threshold (TVE) of older adults living independently in the community. Ten years after initial testing, sixty-two subjects (34 men, mean age 73.5 ± 6.4 y, 28 women, 72.1 ± 5.3 y) achieved VO2max criteria during treadmill walking tests to the limit of tolerance, with TVE determined in a subset of 45. VO2max in men showed a rate of decline of -0.43 ml.kg-1.min-1.y-1, and the decline in VO2max was consequent to a lowered HRmax with no change in the maximum O2 pulse. The women showed a slower rate of decline of VO2max of -0.19 ml.kg-1.min-1.y-1 (p < 0.05), again with a lowered HRmax and unchanged O2 pulse. In this sample, lean body mass was not changed over the 10 year period. Changes in VO2max were not significantly related to physical activity scores. TVE showed a non-significant decline in both men and women. Groupings of young-old (65-72 y at follow-up) versus old-old (73 to 90 y at follow-up) were examined. In men there were no differences in the rate of VO2max decline. The young-old women showed a significant decline in VO2max, whereas old-old women, initially at a VO2max of 19.4 ± 3.1ml.kg-1.min-1, showed no loss in VO2max. The longitudinal data, versus cross-sectional analysis, showed a greater decline for men, but similar estimates of the rates of change in women. Thus, the 10-y longitudinal study of the cohort of community-dwelling older adults who remained healthy, ambulatory, and independent showed a 14% decline in VO2max in men, and a smaller decline of 7% in women, with the oldest women showing little change over the 10-y period.
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