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Vol. 84, Issue 2, 599-605, February 1998
O2 relationships
during submaximal cycle ergometry
Department of Anesthesiology, Mayo Clinic, Rochester, Minnesota 55905
Proctor, David N., Kenneth C. Beck, Peter H. Shen, Tamara J. Eickhoff, John R. Halliwill, and Michael J. Joyner. Influence of
age and gender on cardiac
output-
O2 relationships
during submaximal cycle ergometry. J. Appl.
Physiol. 84(2): 599-605, 1998.
It is presently
unclear how gender, aging, and physical activity status interact to
determine the magnitude of the rise in cardiac output
(
c) during dynamic exercise. To clarify this issue,
the present study examined the
c-O2 uptake
(O2) relationship during
graded leg cycle ergometry in 30 chronically endurance-trained subjects from four groups (n = 6-8/group): younger men (20-30 yr), older men (56-72
yr), younger women (24-31 yr), and older women
(51-72 yr). c (acetylene rebreathing), stroke
volume (c/heart rate), and whole body
O2 were measured at rest
and during submaximal exercise intensities (40, 70, and ~90% of peak
O2). Baseline resting
levels of c were 0.6-1.2 l/min less in the
older groups. However, the slopes of the
c-O2
relationship across submaximal levels of cycling were similar among all
four groups (5.4-5.9 l/l). The absolute c
associated with a given O2
(1.0-2.0 l/min) was also similar among groups. Resting and
exercise stroke volumes (ml/beat) were lower in women than in men but
did not differ among age groups. However, older men and women showed a
reduced ability, relative to their younger counterparts, to maintain
stroke volume at exercise intensities above 70% of peak
O2. This latter effect was
most prominent in the oldest women. These findings suggest that neither
age nor gender has a significant impact on the
c-O2 relationships during submaximal cycle ergometry among chronically endurance-trained individuals.
exercise; master athletes; heart rate; stroke volume; acetylene rebreathing
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