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Exercise and Cardiac Output01:17

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Improving Reporting of Exercise Capacity Across Age Ranges Using Novel Workload Reference Equations.

Everton J Santana1, Jeffrey W Christle2, Nicholas Cauwenberghs3

  • 1Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California; Stanford Cardiovascular Institute, Stanford University, Stanford, California; Research Unit Hypertension and Cardiovascular Epidemiology, Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium.

The American Journal of Cardiology
|February 1, 2024
PubMed
Summary

New workload reference equations improve exercise capacity (EC) assessment in older adults and heart failure patients. These equations provide more accurate percent-predicted workload (%pWL) values, enhancing clinical practice and survival predictions.

Keywords:
cardiorespiratory fitnessexercise testingnonlinear statistical modelsreference limits

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Area of Science:

  • Cardiology
  • Exercise Physiology
  • Geriatrics

Background:

  • Exercise capacity (EC) is a crucial predictor of survival, particularly in individuals with cardiopulmonary conditions.
  • Existing percent-predicted workload (%pWL) equations may overestimate EC in older populations.
  • Accurate EC assessment is vital for effective clinical management and prognosis.

Purpose of the Study:

  • To develop novel workload reference equations (pWL) that accurately reflect the relationship between workload and age.
  • To improve the reporting and interpretation of EC in clinical practice, especially for older adults.
  • To derive equations that better assess EC in patients with heart failure.

Main Methods:

  • Utilized the Fitness Registry and the Importance of Exercise National Database (FRIEND) including 6,966 healthy participants and 1,060 heart failure patients.
  • Developed sex-specific pWL equations based on age using data from apparently healthy individuals.
  • Derived body mass index-adjusted pWL equations for heart failure patients and established thresholds for EC classification (85%-115% pWL).

Main Results:

  • New sex-specific pWL equations were developed: pWL (METs) = 14.1-0.9×10-3×age2 for males and 11.5-0.87×10-3×age2 for females.
  • The novel equations provided better-calibrated %pWL across various age groups compared to existing equations.
  • BMI-adjusted equations demonstrated improved EC assessment in heart failure cohorts.

Conclusions:

  • The newly developed workload reference equations offer a more accurate method for assessing exercise capacity.
  • These equations have the potential to significantly impact the reporting and clinical utility of EC measurements.
  • Improved EC assessment can lead to better patient stratification and management strategies.