Abstract
Saitoh M, Matsunaga A, Kamiya K, Ogura MN, Sakamoto J, Yonezawa R, Kasahara Y, Watanabe
H, Masuda T. Comparison of cardiovascular responses between upright and recumbent
cycle ergometers in healthy young volunteers performing low-intensity exercise: assessment
of reliability of the oxygen uptake calculated by using the ACSM metabolic equation.
Objectives
To clarify (1) differences in cardiovascular response during low-intensity exercise
in the upright versus the recumbent position, and (2) whether the oxygen uptake (V̇o2) calculated by the American College of Sports Medicine (ACSM) metabolic equation
reflects the actual V̇o2 at low-intensity testing.
Design
Repeated-measures comparison study.
Setting
University research laboratory.
Participants
Thirty-one healthy, young volunteers (age, 23±2y).
Interventions
Not applicable
Main outcome measures
Blood pressure, rate pressure product (RPP), V̇o2, oxygen pulse, carbon dioxide output (V̇co2), and ventilatory equivalent (V̇e) were measured during graded exercise testing using upright and recumbent cycle ergometers.
The estimated V̇o2 was calculated by using the ACSM metabolic equation.
Results
Systolic blood pressure, RPP, V̇o2, oxygen pulse, V̇co2, and V̇e at 15 or 30W were significantly higher in the recumbent position than in the upright
one (P<.05), however, no significant differences were observed at 50 and 70W. The estimated
V̇o2 during exercise was significantly higher than the actual one, at every level of intensity,
from 15 to 70W (P<.05).
Conclusions
Cardiovascular responses should be carefully monitored even during low-intensity exercise
using a recumbent cycle ergometer. The V̇o2 estimated using the ACSM metabolic equation did not reflect the actual V̇o2 during low-intensity exercise at 70W or less.
Key words
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Article Info
Footnotes
Supported in part by a grant-in-aid for scientific research (grant no. 15500383) from the Ministry of Education, Science, and Culture in Japan.
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the authors(s) or upon any organization with which the author(s) is/are associated.
Identification
Copyright
© 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation. Published by Elsevier Inc. All rights reserved.
