Interval Training and Hormones in Chronic Heart Failure

July 29, 2017 updated by: Francesco Giallauria, Federico II University

Effects of Interval Training on Hormonal Pathways in Chronic Heart Failure

The investigators aim at investigating whether 24-week high intensity interval training might exert beneficial effects by modulating neurohormonal axis in patients with chronic heart failure (CHF). Furthermore, the effect of detraining on neurohormonal axis in CHF patients will be evaluated.

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

Detailed Description

According to European Society of Cardiology the prevalence of Heart Failure (HF) is between 2 and 3% in general population and increases with age, so the prevalence in 70- to 80-years-old people is between 10 and 20%. HF is the cause of 5% of acute hospital admissions, is present in 10% of patients in hospital beds, and accounts for high national expenditure on health, mostly due to the cost of hospital admissions. Although some patients can live for many years and the great improvement of medical therapy during last decades, overall 50% of patients are dead at 4 years.

Despite different hypothesis that explain the underlying physiopathology of heart failure have been proposed over time, no single paradigm for heart failure was established definitively. One logical explanation of the inability to define the syndrome of heart failure in precise mechanistic model is that the clinical syndrome of heart failure almost certainly represents the summation of multiple anatomic, functional, and biological alterations that interact together in a complex way. Thus, it is not surprising that investigators have used a variety of complex model in an attempt to describe the syndrome of heart failure. Nowadays, the most accepted hypothesis explaining HF physiopathology and its progression is the "neurohormonal model". According to this paradigm, heart failure progresses as a result of the overexpression of biologically active molecules that exert toxic effects on the heart and circulation. A variety of molecules including norepinephrine, angiotensin II, endothelin, aldosterone, and tumor necrosis factor have been implicated as some of the factors that contribute to disease progression in the failing heart.

Despite the effectiveness of the neurohormonal model to explain disease progression and the many insights that it provided for the development of new therapies, there is increasing clinical evidence that suggests that our current models fail to completely explain disease progression. Thus, neurohormonal models may be necessary but not sufficient to explain all aspects of disease progression in the failing heart.

Because the prognosis of HF patients is still unsatisfactory despite optimal therapies, other mechanisms that contribute to HF progression need to be elucidated. Mounting evidence suggest that in heart failure there is a metabolic imbalance characterized by a predominance of the catabolic status over anabolic drive. The most impressive example is seen in end-stage HF known as "cardiac cachexia" characterized by strong weight loss, particularly lean mass and rapid deterioration of clinical conditions, attributed to a prevalence of catabolic pathways. If the hormonal imbalance is an epiphenomenon or an important pathophysiological mechanism in the HF progression is still matter of debate.

In particular deficit of each anabolic axis (adrenal, gonadal and somatotropic axes) is an independent marker of poor prognosis in HF patients and the coexistence of more than one deficiency identifies a subgroup of patients with a higher mortality.

The most involved hormonal axes include growth hormone (GH), its tissue effector insulin-like growth factor-1 (IGF-1), thyroid hormone, and anabolic steroids. Taken together, these alterations could be recognized as a multiple hormonal and metabolic deficiency syndrome (MHD) in HF patients. MHD has a significant impact on cardiac performance and HF progression.

The most involved hormonal axes include growth hormone (GH), its tissue effector insulin-like growth factor-1 (IGF-1), thyroid hormone, and anabolic steroids. Taken together, these alterations could be recognized as a multiple hormonal and metabolic deficiency syndrome (MHD) in HF patients. MHD has a significant impact on cardiac performance and HF progression.

Moreover, a pattern of Insulin-resistance (IR) is quite common in diabetic as well as non-diabetic CHF patients. IR has been found in about 30% of non-diabetic CHF patients and was related to underlying disease severity. Few studies have considered reduction of IR as a new therapeutic target.

In brief, it could be argued that CHF patients showed an anabolic/catabolic imbalance due to multiple neurohormonal axis disequilibrium. Anabolic hormonal deficiency is usually described in men with chronic heart failure (CHF) contributing to the anabolic/catabolic imbalance ultimately resulting in skeletal muscle waist and cardiac cachexia. Counteracting the anabolic deficit seems to play beneficial clinical effects in CHF patients. In fact, the increase of serum levels of testosterone and growth hormone (GH)/insulin-like growth factor 1 (IGF-1) axis obtained by hexogen administration, improves key symptoms of CHF such as exercise intolerance and muscle fatigue and positively impact quality of life. Besides the hexogen administration, an increase of the levels of anabolic hormones can be obtained through physical exercise. In healthy subjects, testosterone may increase remarkably as an acute response to both endurance and heavy resistance exercise. Similarly, GH concentrations generally increase in response to both strength and endurance exercise thereby stimulating IGF-1 production. Although this hormonal modulation could be one of the mechanisms by which exercise training exerts its beneficial effects on CHF patients, there are few data on endogenous exercise-induced increase of anabolic hormones in such patients.

Aside from the nature of the training activity, the effects of training may vary with different dose parameters, specifically program length, session duration and frequency and workload or intensity. In the most severely impaired patients, with initial exercise intolerance, sessions may initially be limited to 3-5 minutes duration with 3 or 4 sessions completed during the course of the day; however, recent work has suggested that if total exercise energy expenditure is standardized then intermittent exercise training programs may elicit superior benefits to heart failure patients compared to continuous exercise training sessions.

High intensity, repeated intermittent work periods separated by recovery periods have been shown to be efficacious in heart failure patients, and interval stress has been shown to be as effective as continuous workloads in older, healthy and post coronary artery bypass surgery populations. In a systematic review of 81 heart failure ExT studies only two of these reported peak VO2 changes of 10% and 20% respectively compared with 16.5% overall change in continuous exercise training and similar improvements with strength training. The underlying theory is that higher intensity, intermittent stress is more likely to promote peripheral adaptations and produce concurrent improvements in functional capacity. Recent work has shown that reductions of brain natriuretic peptide, a marker of myocardial stretch, may be greater in high intensity (90% peak VO2), rather than moderate intensity (70% peak VO2) exercise training in patients with severe left ventricular dysfunction. A recent meta-analysis showed that intermittent exercise elicits superior improvements in peak VO2 and VE/VCO2 slope compared to continuous exercise training in heart failure patients.

Few studies evaluated the hormonal response to interval training in CHF. However, the relatively small sample size, the lack of control group or the relatively short time exercise intervention limits the conclusions.

The present study aims at investigating whether 24-week high intensity interval training might exert beneficial effects by modulating neurohormonal axis in CHF patients. Furthermore, the effect of detraining on neurohormonal axis in CHF patients will be evaluated.

Study Type

Interventional

Enrollment (Anticipated)

80

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

  • Name: Antonello Cittadini, MD, PhD
  • Phone Number: 4375 +39081746
  • Email: cittadin@unina.it

Study Locations

  • Italy
      • Naples, Italy, 80131
        • Recruiting
        • Division of Internal Medicine and Cardiac Rehabilitation
        • Contact:
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Stable New York Heart Association (NYHA) class II or III
  • Resting left ventricular ejection fraction below 40%
  • Measured peak VO2 below 14 ml/kg/min [Patients must be stable on prescribed cardiac medication for 1 month prior to entering the study]

Exclusion Criteria:

  • myocardial infarction within 12 months prior to study entry;
  • unstable angina; resting systolic blood pressure above 200 mmHg, or diastolic blood pressure above 110 mmHg;
  • fever of unknown significance;
  • critical aortic stenosis (peak systolic pressure gradient > 50 mm Hg with an aortic valve orifice area < 0.75 cm2 in average size adult);
  • uncontrolled atrial or ventricular arrhythmias such as uncontrolled sinus tachycardia (> 120 beats.min-1);
  • II or greater atrio-ventricular block;
  • active pericarditis or myocarditis;
  • recent embolism and thrombophlebitis;
  • uncontrolled diabetes HbA1C%>9.5%;
  • severe orthopedic or other medical conditions that would prohibit exercise;
  • metabolic conditions such as acute thyroiditis, hypokalemia or hyperkalemia and hypovolemia;
  • severe renal dysfunction (i.e. creatinine plasma levels >2.5 mg/dl);
  • severe concomitant non-cardiac diseases such as cancer, dementia or any systemic disease limiting exercise;
  • inability to participate in a prospective study for any logistic reason

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Interval Training
Hospital outpatient-based regimen (3 times/week for 24 weeks) exercise program will be performed by cycling for 4 minutes with 1-minute rest between intervals. High intensity exercise will be 90-95% peak heart rate. The exercise intensity will be established, and maintained throughout the 24-week exercise training period, by calculating the heart rate range as a percentage of maximum (90-95%) as obtained from the most recent cardiopulmonary exercise test. Every 4 weeks during the training program, the exercise intensity will be titrated to the same relative percentage of maximum (90-95%) as it is assumed most patients will become fitter over the training period.
Other: Interval Training
Exercise training protocol (high intensity, interval training) is followed by the enrolled patients on hospital outpatient-based regimen 3 times/week for 24 weeks. The high intensity group will perform interval cycling for 4 minutes with 1-minute rest between intervals. High intensity exercise will be 90-95% peak heart rate. The exercise intensity will be established, and maintained throughout the 24-week exercise training period, by calculating the heart rate range as a percentage of maximum (90-95%) as obtained from the most recent cardiopulmonary exercise test. Every 4 weeks during the training program, the exercise intensity will be titrated to the same relative percentage of maximum (90-95%) as it is assumed most patients will become fitter over the training period.
Other Names:
  • High Intensity Training
  • Intermittent Training
No Intervention: Controls
CHF patients allocated to the control group (no intervention) will undergo biochemical and hormonal sampling, Doppler-echocardiography, cardiopulmonary exercise stress testing at study enrollment and at 24-week follow-up.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
peak exercise oxygen consumption (VO2peak)
Time Frame: 24 weeks
cardiopulmonary functional capacity
24 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
growth hormone (GH) - insulin-like growth factor-1 (IGF-1)
Time Frame: 24-week
GH/IGF-1 axis balance
24-week
brain natriuretic peptide
Time Frame: 24-week
BNP assay
24-week

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Federico II University

Investigators

  • Study Director: Carlo Vigorito, MD, Federico II University of Naples

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 2015

Primary Completion (Anticipated)

January 1, 2018

Study Completion (Anticipated)

January 1, 2019

Study Registration Dates

First Submitted

December 17, 2014

First Submitted That Met QC Criteria

December 17, 2014

First Posted (Estimate)

December 22, 2014

Study Record Updates

Last Update Posted (Actual)

August 1, 2017

Last Update Submitted That Met QC Criteria

July 29, 2017

Last Verified

July 1, 2017

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • UNINA-34/13

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Undecided

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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