Assessment of Maximal Oxygen Uptake in Cardiac Rehabilitation
NCT ID: NCT06113133
Last Updated: 2023-11-02
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
97 participants
OBSERVATIONAL
2022-12-01
2023-05-31
Brief Summary
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Heart disease and characteristics for all participants are obtained. Participants underwent a maximal exercise test on an ergometer cycle with direct measurement of oxygen uptake to assess oxygen plateau attainment. This included measurement of the maximal oxygen uptake, respiratory exchange ratio, heart rate and the ratio of perceived exertion (BORG6-20).
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Detailed Description
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To examine the primary aim, the incidence of a plateau in oxygen uptake was examined by comparing the moving average of the last 15 consecutive breaths with the penultimate 15 breaths and cut-offs at \<50 ml and \<100 ml of oxygen.
Secondary criteria; Respiratory exchange ratio (RER max), Rating of perceived exertion (BORG RPE max) and heart rate (HR max) are examined to determine if the participant performs the exercise test with a maximal effort to exertion. The respiratory exchange ratio (VCO2/VO2) using age-depending RER cut-offs; 1.10 for ages 40-59 years, 1.06 for ages 60-69 years and +70 years to determine if a maximal effort is provided. There are no recommendations for RER cut-off when participants are aged above 69 years. Therefore, they must reach the RER cut-off 1.06 to be evaluated as maximal effort.
The rating of perceived exertion using the BORG RPE 6-20 scale evaluation \> 17 is considered maximal effort. The test was supervised by experienced physiotherapists, an in-house nurse supported if necessary, and a physician was available upon request. Participants and physiotherapists were blinded for VO2 max results from CPET. CPET gas exchange system was operated by an experienced researcher.
Maximal heart rate is rated as a maximal effort by cut-offs calculated as 208 - (0.7 x age in years) according to age group. Using respectively, \> 92% and \> 89% of the calculated HR max for the age group 40-59 years and the age groups 60-69 years and +70 years to consider maximal effort.
Conditions
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Study Design
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COHORT
OTHER
Study Groups
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Maximal oxygen uptake
Measurement of maximal oxygen uptake using \< 50-millilitre and 100 millilitre oxygen as a cut-off
measurement of oxygen uptake
oxygen uptake is obtained during a maximal exercise test
Interventions
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measurement of oxygen uptake
oxygen uptake is obtained during a maximal exercise test
Eligibility Criteria
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Inclusion Criteria
Exclusion Criteria
18 Years
ALL
No
Sponsors
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VIA University College
OTHER
Responsible Party
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Principal Investigators
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Maribo, Professor
Role: STUDY_CHAIR
University of Aarhus
Locations
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Claus Sevel
Aarhus N, , Denmark
Countries
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Other Identifiers
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9000035
Identifier Type: -
Identifier Source: org_study_id
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