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J Appl Physiol 65: 1147-1151, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 65, Issue 3 1147-1151, Copyright © 1988 by American Physiological Society

ARTICLES

Role of muscle loss in the age-associated reduction in VO2 max

J. L. Fleg and E. G. Lakatta
Gerontology Research Center, National Institute on Aging, Baltimore, Maryland 21224.

A progressive decline in maximal O2 consumption (VO2max) expressed traditionally as per kilogram body weight generally occurs with advancing age. To investigate the extent to which this decline could be attributable to the age-associated loss of metabolically active tissue, i.e., muscle, we measured 24-h urinary creatinine excretion, an index of muscle mass, in 184 healthy nonobese volunteers, ages 22-87 yr, from the Baltimore Longitudinal Study of Aging who had achieved a true VO2max during graded treadmill exercise. A positive correlation was found between VO2max and creatinine excretion in both men (r = 0.64, P less than 0.001) and women (r = 0.47, P less than 0.001). As anticipated, VO2max showed a strong negative linear relationship with age in both men and women. Creatinine excretion also declined with age in men and women. When VO2max was normalized for creatinine excretion, the variance in the VO2max decline attributable to age declined from 60 to 14% in men and from 50 to 8% in women. Thus comparing the standard age regression of VO2max per kilogram body weight with that in which VO2max is normalized per milligram creatinine excretion, the decline in VO2max between a hypothetical 30 yr old and a 70 yr old was reduced from 39 to 18% in men and from 30 to 14% in women. We conclude that in both sexes, a large portion of the age-associated decline in VO2max in non-endurance-trained individuals is explicable by the loss of muscle mass, which is observed with advancing age.


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M. C. Geokas, E. G. Lakatta, T. Makinodan, and P. S. Timiras
The Aging Process
Ann Intern Med, September 15, 1990; 113(6): 455 - 466.
[Abstract] [PDF]


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