A Study of Oxygen Cost of Exercise in Patients with and without Heart Failure


  • Study type

  • Study IDs

  • Describes the nature of a clinical study. Types include:

    • Observational study — observes people and measures outcomes without affecting results.
    • Interventional study (clinical trial) — studies new tests, treatments, drugs, surgical procedures or devices.
    • Medical records research — uses historical information collected from medical records of large groups of people to study how diseases progress and which treatments and surgeries work best.
  • Site IRB
    • Rochester, Minnesota: 09-008507
    Sponsor Protocol Number: 09-008507

About this study

This study is being done to: (1) develop a simple tool to assess breathing muscle performance; (2) measure the oxygen cost of breathing during exercise; (3) measure the respiratory muscle blood flow requirements of hyperpnea during exercise; and (4) to quantify the energy cost of exercise in relation to disease severity.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. If you need assistance understanding the eligibility criteria, please contact the study team.

See eligibility criteria

Inclusion Criteria:             

  • Heart Failure patients with a history of stable idiopathic dilated or ischemic cardiomyopathy (>1 yr, with >/ =1 episode of congestive failure requiring hospitalization)
  • New York Heart Association Class II and III symptoms
  • No history of dangerous arrhythmia's
  • Not pacemaker dependent
  • Less than class II obesity (BMI
  • No or minimal smoking history (<15 pk years)

CHF patients with an ejection fraction of less than 40% will be included in the Heart Failure with Reduced Ejection Fraction (HFrEF) group.

  • All other CHF patients will be included in the Heart Failure with Preserved Ejection Fraction (HFpEF) group. 

Controls will consist of age, gender , and BMI matched subjects 

  • No history of cardiovascular related abnormalities (i.e. Hx of shortness of breath, chest discomfort, abnormal rest or exercise ECG)
  • Non-obese (BMI 20-32)  
  • No or minimal smoking history (<15 pk yrs)

Exclusion Criteria:   

  • Unable to engage in exercise testing due to existing comorbidities.

Participating Mayo Clinic locations

Study statuses change often. Please contact us for help.

Mayo Clinic Location Status Contact

Rochester, Minn.

Mayo Clinic principal investigator

Bruce Johnson, Ph.D.

Open for enrollment

Contact information:

Briana Ziegler



More information


Publications are currently not available

Study Results Summary

Not yet available

Supplemental Study Information

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