Related Experiment Video
Updated: Aug 15, 2026
08:21
Biventricular Assessment of Cardiac Function and Pressure-Volume Loops by Closed-Chest Catheterization in Mice
Published on: June 15, 2020
Functional capacity in patients with congestive heart failure
M C Hendrican1, R S McKelvie, T Smith
1Department of Medicine, Hamilton Civic Hospitals Research Centre, Hamilton General Hospital, McMaster University, Ontario, Canada.
Journal of Cardiac Failure
|September 21, 2000
Summary
The six-minute walk work (6MWw) better reflects exercise capacity in heart failure patients than the six-minute walk distance (6MWd). Combining aerobic and strength training may improve 6MWw and 6MWd.
Area of Science:
- Cardiology
- Exercise Physiology
- Rehabilitation
Background:
- The six-minute walk distance (6MWd) is crucial for assessing daily activities and prognosis in congestive heart failure (CHF) patients.
- Understanding factors influencing 6MWd variability is important for accurate patient assessment.
Purpose of the Study:
- To evaluate the relationship between 6MWd, peak aerobic capacity (VO2), and dynamic muscle strength in CHF patients.
- To determine if the work performed during the six-minute walk (6MWw) is a superior indicator of exercise capacity compared to 6MWd.
Main Methods:
- Assessed 180 CHF patients (age 66±10 years, 146 men) for 6MWd, peak VO2, and dynamic muscle strength.
- Correlated 6MWd and 6MWw with peak VO2 and dynamic muscle strength.
- Utilized multivariate analysis to identify predictors of 6MWw.
Main Results:
- 6MWd showed weak to moderate correlations with dynamic muscle strength (r=0.33-0.41) and peak VO2 (r=0.48).
- 6MWw demonstrated strong correlations with dynamic muscle strength (r=0.63-0.70) and peak VO2 (r=0.77).
- A model combining dynamic muscle strength and peak VO2 explained 69% of the variance in 6MWw, surpassing peak VO2 alone (R²=0.59).
Conclusions:
- 6MWw is a significantly better correlate of peak VO2 and dynamic muscle strength than 6MWd in CHF patients.
- 6MWw may offer a more accurate reflection of a patient's overall exercise capacity.
- Exercise programs incorporating both aerobic and strength training could enhance 6MWw and subsequently improve 6MWd in CHF patients.
More Related Videos
Related Concept Videos
01:17Pathophysiology of Heart Failure
Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
01:26Imbalances in Cardiac Output
The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
01:27Heart Failure I: Introduction
Heart failure refers to a clinical syndrome caused by structural or functional cardiac disorders that prevent the heart from pumping an adequate amount of blood to meet the body's metabolic needs. This condition often arises from myocardial infarction or ischemia, leading to decreased cardiac output, reduced tissue perfusion, impaired gas exchange, fluid volume imbalance, and decreased functional ability.Heart failure can result from disruptions in the mechanisms that regulate cardiac output...
01:30Heart Failure IV: Classification and Diagnostic Evaluation
Heart failure can be classified in various ways, with the most common classifications based on physical activity limitations, disease progression, severity, and treatment strategies.The Functional Classification of Heart Failure divides patients into four categories based on physical activity limitation due to symptom burden.Class I: Patients in this class have cardiac disease but no physical activity limitations. Ordinary activities like walking, climbing stairs, or routine tasks do not cause...
01:22Heart Failure VI: Adjunct Therapies
Additional therapies for treating patients with heart failure (HF) may include procedural interventions, supplemental oxygen, the management of sleep disorders, and nutritional therapy.Procedural InterventionsImplantable Cardioverter-Defibrillator: For patients at risk of life-threatening arrhythmias due to severe left ventricular dysfunction, an Implantable Cardioverter-Defibrillator (ICD) can detect and terminate these arrhythmias, preventing sudden cardiac death and improving survival rates.
01:30Heart Failure VII: Nursing Interventions
The first step in nursing management of a patient with heart failure involves thoroughly assessing the patient's medical history.Subjective Data: Obtain the patient's medical history of coronary artery disease, hypertension, myocardial infarction, and symptoms like dyspnea, orthopnea, and paroxysmal nocturnal dyspnea.Objective Data: Conduct a physical examination to identify findings such as jugular vein distention, pulmonary crackles, tachycardia, murmurs, peripheral edema, and vital signs,...