- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01593007
Inspiratory Muscular Training
June 12, 2012 updated by: Daniella Cunha Brandao, Universidade Federal de Pernambuco
REGIONAL LUNG VENTILATION DISTRIBUTION AMONG INDIVIDUALS WITH CHRONIC HEART FAILURE AFTER AN INSPIRATORY MUSCLE TRAINING PROGRAMM: A RANDOMIZED CONTROLLED CLINICAL TRIAL
Objectives: To evaluate regional lung ventilation distribution in patients suffering from chronic heart failure (CHF) after completing inspiratory muscle training (IMT) and correlate it with functional capacity and quality of life among these individuals.
Methods and Results: Nineteen CHF patients were randomly assigned to two groups: Control and IMT.
Before and after muscle training, subjects were submitted to assessment protocol for respiratory muscles, digital spirometry, optoelectronic plethysmography (OEP), the six-minute walk test (6MWT) and a quality of life questionnaire (MLHFQ).
There was no difference in lung function following the 12-week training period in either group.
However, the IMT group showed an increase in actual and predicted MIP, higher MLFHQ score and greater distance walked in the 6MWT, as well as a reduction in the Borg scale after the 6 MWT in relation to the control.
For the OEP, IMT group members exhibited higher values for total chest wall volume (Vcw), abdominal rib cage volume (Vrc,a) and abdominal volume (Vab) when compared to the control.
Conclusions: For patients with CHF, IMT proved efficient in improving muscle strength, functional capacity and quality of life.
The present study also analyzed the distribution behavior of lung volumes for the thoracoabdominal system in this population, showing that larger abdominal rib cage and abdomen volumes may result in more effective diaphragmatic contraction.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Study Type
Interventional
Enrollment (Actual)
19
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 Locations
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Pernambuco
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Recife, Pernambuco, Brazil
- Departamento de Fisioterapia-Universidade Federal de pernambuco
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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
21 years to 65 years (Adult, Older Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- sedentary adults diagnosed with functional class II and II CHF in accordance with the New York Heart Association (NYHA);
- in stage B or C according to American College of Sports Medicine guidelines;
- with left ventricle ejection fraction lower than 45% (evaluated by echocardiogram in a period ≤ 1 year);
- cardiomegaly confirmed by increased left ventricle end-diastolic (LVDD) and end-systolic diameter (LVESD) associated with a cardiac index (CI) >0.5 according to chest X-rays;
- inspiratory muscle weakness (MIP <70% of predicted values);
- clinical stability with no change in medication for at least three months and sedentary (no regular physical activity performed in the previous six months or not accumulating 30 minutes or more of moderate physical activity - 3 to 6 METs - on most week days).
Exclusion Criteria:
- patients exhibiting unstable angina, myocardial infarction or prior heart surgery up to three months before beginning the investigation;
- orthopedic, infectious or chronic metabolic diseases;
- treatment with steroids, hormones or chemotherapy;
- ratio between forced expiratory volume in one second and forced vital capacity (FEV1/FVC) < 70% of predicted, characterizing an obstructive respiratory disorder;
- respiratory diseases, smokers and ex-smokers with a history of cigarettes/day for more than 10 years.
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 |
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Experimental: Inspiratory Muscle Training
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All participants were instructed to use a Threshold® trainer for 30min a day, seven times a week over 12 consecutive weeks.10
Patients in the Control Group used a Threshold ® device without resistance, making them blind to the treatment.
For the treatment group, inspiratory resistance of the Threshold® trainer was 30% of MIP, adjusted on a weekly basis to remain constant.
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Placebo Comparator: Control group
Patients from the control group were also assessed weekly to ensure homogenization of the learning effect for the manometer maneuver.
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Patients from the control group were also assessed weekly to ensure homogenization of the learning effect for the manometer maneuver.
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Respiratory muscles
Time Frame: 3 months
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In order to evaluate inspiratory muscle strength, a digital manometer was used (MVD-300, Globalmed, Brazil) connected to a mouthpiece with a 2mm opening to reduce the influence of pressure caused by glottal closure.
In a sitting position, each patient performed up to six maneuvers to obtain MIP, from residual volume (RV) to total functional capacity (TFC), considering the best of three maneuvers with < 10% variation between them
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3 months
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Assessment of respiratory mechanics by Optoelectronic Plethysmography
Time Frame: 3 months
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The optoelectronic plethysmography system (OEP) of BTS Bioengineering (Italy) was employed in this study.
To that end, a calibration instrument was used, containing three axes connected to reflective markers.
This phase does not require participation by the individual to be examined.
This creates a three-dimensional model, dividing the thoracoabdominal system into three parts: pulmonary rib cage (RCp), abdominal rib cage (RCa) and the abdomen (AB).
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3 months
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Evaluation of submaximal functional capacity
Time Frame: 3 mounths
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Functional capacity was assessed by the six-minute walk test (6MWT), according to the protocol published by the American Thoracic Society (ATS).
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3 mounths
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Quality of Life Questionnaire: Minnesota Living With Heart Failure Questionnaire (MLHFQ)
Time Frame: 3 months
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The MLHFQ is a questionnaire validated for the Brazilian population, consisting of 21 questions regarding limitations frequently associated with the extent to which heart failure has affected patient's lives in the previous month.
Each question is attributed a value from 0 (zero) to 5 (five), with the highest score indicating worse quality of life.
The total score is calculated by adding the 21 items, with a possible interval between 0 and 105.
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3 months
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
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
- Chiappa GR, Roseguini BT, Vieira PJ, Alves CN, Tavares A, Winkelmann ER, Ferlin EL, Stein R, Ribeiro JP. Inspiratory muscle training improves blood flow to resting and exercising limbs in patients with chronic heart failure. J Am Coll Cardiol. 2008 Apr 29;51(17):1663-71. doi: 10.1016/j.jacc.2007.12.045.
- Olson TP, Beck KC, Johnson BD. Pulmonary function changes associated with cardiomegaly in chronic heart failure. J Card Fail. 2007 Mar;13(2):100-7. doi: 10.1016/j.cardfail.2006.10.018.
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
June 1, 2010
Primary Completion (Actual)
April 1, 2011
Study Completion (Actual)
May 1, 2011
Study Registration Dates
First Submitted
May 3, 2012
First Submitted That Met QC Criteria
May 4, 2012
First Posted (Estimate)
May 7, 2012
Study Record Updates
Last Update Posted (Estimate)
June 13, 2012
Last Update Submitted That Met QC Criteria
June 12, 2012
Last Verified
October 1, 2011
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- tese02
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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