A predictor of aerobic threshold for patients with heart failure with reduced ejection fraction

Journal of Physical Therapy Science
Sawako YamamotoOsamu Nitta

Abstract

[Purpose] The initial cardiopulmonary response to exercise is hypothesized to be a useful predictor of aerobic threshold in patients with heart failure. This study aimed to evaluate the correlation between aerobic threshold and cardiopulmonary responses to exercise onset by comparing patients with heart failure using preserved (≥50%) and reduced (<50%) left ventricular ejection fractions. [Participants and Methods] Twenty-eight males (age, 36-82 years; 12 with preserved and 16 with reduced left ventricular ejection fractions) underwent a progressive submaximal cardiopulmonary exercise test using a cycle ergometer. The aerobic threshold, time constant, and area under the oxygen uptake curve for the first 4 min (V̇O2AUC) were determined. [Results] A significant association was observed between aerobic threshold and V̇O2AUC in the reduced group but not in the preserved group. No significant correlations were found between time constant and V̇O2AUC or between aerobic threshold and time constant in either group. [Conclusion] The results suggest that V̇O2AUC measured from exercise onset to an initial 4-min period could provide an easily and safely obtained predictor to assess aerobic capacity in people with reduced left ventricular e...Continue Reading

References

Aug 1, 1992·International Journal of Cardiology·H AsanoiS Sasayama
Jul 11, 1988·The American Journal of Cardiology·P A McElroyK T Weber
Mar 15, 2002·The New England Journal of Medicine·Jonathan MyersJ Edwin Atwood
Jun 5, 2002·Japanese Heart Journal·Yoshihiro J AkashiHaruki Itoh

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