Predicting peak oxygen consumption during a conservative ramping protocol implications for the heart failure population

Ross Arena, Reed Humphrey, Mary Ann Peberdy, Michael Madigan

    Research output: Contribution to journalArticlepeer-review

    Abstract

    PURPOSE: A significant discrepancy between measured oxygen consumption (VO2) (via ventilatory expired gas analysis) and estimated VO2 (via the imposed workload) frequently is reported in the heart failure (HF) population during symptom-limited exercise testing. The purpose of this investigation was to examine the difference between measured and estimated VO2 (VO2 discrepancy) during a highly conservative ramping protocol. METHODS: For this study, 28 subjects with compensated HF (20 men and 8 women; age, 51.1 ± 14.6 years) and 19 healthy control subjects (age-, gender-, and activity-matched to an HF subgroup) underwent symptom-limited exercise testing (treadmill) with ventilatory expired gas analysis. RESULTS: Peak estimated and measured VO2 values were significantly higher in the age-, gender-, and activity-matched control group than in the HF group, but the change in measured VO2 per change in estimated VO2 (Δmeasured/Δestimated VO2 slope) and the VO2 discrepancy did not reach statistical significance. Peak estimated VO2 was a significant predictor of peak measured VO2 in the overall HF group (R2 = 0.90; P < .001). CONCLUSIONS: Although estimated VO2 is not considered a replacement for measured VO2, these results indicate that a highly conservative exercise protocol may allow for a more accurate prediction of peak measured VO2 via the estimated oxygen cost for a given workload in patients with compensated HF.

    Original languageEnglish
    Pages (from-to)183-189
    Number of pages7
    JournalJournal of Cardiopulmonary Rehabilitation
    Volume23
    Issue number3
    DOIs
    StatePublished - May 2003

    Keywords

    • Oxygen consumption
    • Symptom-limited exercise testing
    • Treadmill
    • Ventilatory expired gas analysis

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