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1 Human Cardiovascular Research Laboratory, Department of Kinesiology and Applied Physiology, University of Colorado, Boulder 80309; and 2 Divisions of Cardiology and Geriatric Medicine, Department of Medicine, University of Colorado Health Sciences Center, Denver, Colorado 80262
To determine the
relation between habitual endurance exercise status and the
age-associated decline in maximal aerobic capacity [i.e., maximal
O2 consumption
(
O2 max)] in men, we performed a
well-controlled cross-sectional laboratory study on 153 healthy men
aged 20-75 yr: 64 sedentary and 89 endurance trained.
O2 max (ml · kg
1 · min
1),
measured by maximal treadmill exercise, was inversely related to age in
the endurance-trained (r =
0.80) and sedentary
(r =
0.74) men but was higher in the
endurance-trained men at any age. The rate of decline in
O2 max with age
(ml · kg
1 · min
1)
was greater (P < 0.001) in the endurance-trained than
in the sedentary men. Whereas the relative rate of decline in
O2 max (percent decrease per decade
from baseline levels in young adulthood) was similar in the two groups,
the absolute rate of decline in
O2 max was
5.4 and
3.9
ml · kg
1 · min
· decade
1
in the endurance-trained and sedentary men, respectively.
O2 max declined linearly across the
age range in the sedentary men but was maintained in the
endurance-trained men until ~50 yr of age. The accelerated decline in
O2 max after 50 yr of age in the
endurance-trained men was related to a decline in training volume
(r = 0.46, P < 0.0001) and was
associated with an increase in 10-km running time (r =
0.84, P < 0.0001). We conclude that the rate of
decline in maximal aerobic capacity during middle and older age is
greater in endurance-trained men than in their sedentary peers and is
associated with a marked decline in O2 pulse.
maximal oxygen consumption; aging; functional capacity
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