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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

      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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