Influence of age and gender on cardiac output-VO2 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- O 2 relationships during submaximal cycle ergometry. J. Appl. Physiol....

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Published in:Journal of applied physiology (1985) 1998-02, Vol.84 (2), p.599-605
Main Authors: Proctor, David N, Beck, Kenneth C, Shen, Peter H, Eickhoff, Tamara J, Halliwill, John R, Joyner, Michael J
Format: Article
Language:English
Subjects:
Adult
Aged
Aging - physiology
Biological and medical sciences
Cardiac Output - physiology
Cross-Sectional Studies
Exercise Test
Female
Fundamental and applied biological sciences. Psychology
Heart
Hemodynamics - physiology
Humans
Male
Middle Aged
Oxygen Consumption - physiology
Physical Education and Training
Physical Endurance - physiology
Sex Factors
Space life sciences
Vertebrates: cardiovascular system
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Summary: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- O 2 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-O 2 uptake ( O 2 ) 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 O 2 were measured at rest and during submaximal exercise intensities (40, 70, and ~90% of peak O 2 ). Baseline resting levels of c were 0.6-1.2 l/min less in the older groups. However, the slopes of the c- O 2 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 O 2 (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 O 2 . 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- O 2 relationships during submaximal cycle ergometry among chronically endurance-trained individuals. exercise; master athletes; heart rate; stroke volume; acetylene rebreathing The Journal of Applied Physiology 84(2):599-605 8750-7587/98 $5.00 Copyright © 1998 the American Physiological Society
ISSN:8750-7587
1522-1601
DOI:10.1152/jappl.1998.84.2.599