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J Appl Physiol (January 11, 2002). doi:10.1152/japplphysiol.01124.2001
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Articles in PresS, published online ahead of print January 11, 2002
J Appl Physiol, 10.1152/jap.01124.2001
Submitted on November 9, 2001
Accepted on January 9, 2002

Changes in Maximal Aerobic Capacity with Age in Endurance-Trained Women: 7-Year Follow-Up

Iratxe Eskurza1, Anthony J Donato1, Kerrie L Moreau1, Douglas R Seals2, and Hirofumi Tanaka1*

1 Departments of Kinesiology & Applied Physiology, University of Colorado at Boulder, Boulder, CO, USA
2 Departments of Kinesiology & Applied Physiology, University of Colorado at Boulder, Boulder, CO, USA; Department of Medicine, University of Colorado Health Sciences Center, Denver, CO, USA

* To whom correspondence should be addressed. E-mail: htanaka{at}mail.utexas.edu.

Based on cross-sectional data we previously reported that the absolute, but not the relative (%), rate of decline in maximal oxygen consumption (VO2max) with age is greater in endurance-trained compared with healthy sedentary women. We tested this hypothesis using a longitudinal approach. Eight sedentary (63±2 y at follow-up) and 16 endurance-trained (57±2) women were re-evaluated after a mean follow-up period of 7 years. At baseline, VO2max was ~70% higher in the endurance-trained women (48.1±1.7 vs. 28.1 ml/kg/min/year). At follow-up, body mass, fat-free mass, maximal respiratory exchange ratio, and maximal rating of perceived exertion were not different from baseline in either group. The absolute rate of decline in VO2max was twice as great (P<0.01) in the endurance-trained (-0.84±0.15 ml/kg/min/year) vs. sedentary (-0.40±0.12) group, but the relative rates of decline were not different (-1.8±0.3 vs. -1.5±0.4%/year). The differences in rates of decline in VO2max were not related to changes in body mass or maximal heart rate. However, among endurance-trained women, the relative rate of decline in VO2max was positively related to reductions in training volume (r=0.63). Consistent with this, the age-related reduction in VO2max in a subgroup of endurance-trained women who maintained/increased training volume was not different from that of sedentary women. These longitudinal data indicate that the greater decrease in maximal aerobic capacity with advancing age observed in middle-aged and older endurance-trained women in general compared with their sedentary peers is due to declines in habitual exercise in some endurance-trained women. Endurance-trained women who maintain or increase training volume demonstrate age-associated declines in maximal aerobic capacity not different from healthy sedentary women.




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