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1 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
We tested the hypothesis that the age-related decline in
maximal aerobic capacity, as measured by maximal oxygen uptake
(
O2 max), is greater in Hispanic than
in Caucasian women. We studied 146 healthy sedentary women aged
20-75 yr: 53 Hispanic (primarily of Mexican descent) and 93 Caucasian (non-Hispanic white). The groups did not differ in mean age,
body mass, percent body fat, estimated physical activity-related energy
expenditure, or education-based socioeconomic status (SES). During
maximal exercise, respiratory exchange ratio, rating of perceived
exertion, and percent predicted maximal heart rate were similar across
age and ethnicity, suggesting equivalent maximum voluntary efforts in
all subjects.
O2 max (ml · kg
1 · min
1) was
inversely related to age (P < 0.01) in Caucasian
(r =
0.68) and Hispanic (r =
0.61) women.
The absolute rate of decline in
O2 max
with age was the same in the two groups (
0.31 ml · kg
1 · min
1 · yr
1).
The relative rate of decline (% from age 25 yr) also was similar in
the Caucasian (
9.0%) and Hispanic (
9.2%) women. When subjects of
all ages were pooled, mean levels of
O2 max were similar in the two groups
(~28 ml · kg
1 · min
1).
These results, the first to our knowledge in Hispanics, indicate that
mean levels of
O2 max, as well as the
rate of decline in
O2 max with age, are
similar in healthy sedentary Hispanic and Caucasian women of similar
SES. Thus it does not appear that Hispanic ethnicity per se modulates
maximal aerobic capacity in this population.
aging; maximal oxygen uptake; Mexican-American
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