Signaling Pathway Activation After Exercise in Patients With Chronic Obstructive Pulmonary Disease (SIM)

May 3, 2013 updated by: Bruno Lemire, Laval University

Signaling Pathway Activation in the Quadriceps of Patients With COPD After an Acute Bout of Resistance

Muscle weakness and atrophy are important consequences of chronic obstructive pulmonary disease (COPD). Although resistance exercises increase strength and muscle mass in patients with COPD, the response to training appears to be suboptimal in these individuals. A dysregulation in the signaling pathways involved in the regulation of muscle mass could play an important role in this phenomenon.

Hypothesis: Proteins involved in muscle mass regulation will be less activated in the quadriceps of patients with COPD following the acute bout of resistance training exercise compared to healthy age-matched controls.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Our objective is to investigate the impact of an acute bout of resistance training on key signaling pathways involved in the regulation of muscle mass in moderate to severe COPD (FEV1 under 60% of predicted). Key proteins of signaling intramuscular pathways involved in protein synthesis and degradation will be measured before after 72 contractions of the quadriceps. The exercise protocol was designed to match the actual exercise prescription model use in the context of pulmonary rehabilitation. A squat, leg press and leg extension will be done at 80% of max with one minute rest between sets. A biopsy of the quadriceps will be done before and after exercise in order to measure phosphorylated kinases, total protein content and mRNA expressions. All our patients will undergo a thorough baseline assessment in pulmonary capacity, muscle force and body composition.

Study Type

Interventional

Enrollment (Actual)

21

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

  • Canada
    • Quebec
      • Quebec City, Quebec, Canada, G1V 4G5
        • IUCPQ

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

48 years to 73 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Male

Description

Inclusion Criteria:

  • Male
  • COPD with an FEV1 of under 60% of predicted
  • non-smoker
  • Between 50 and 75 years old

Exclusion Criteria:

  • All inflammatory disease (HIV, Cancer, renal and cardiac deficiency)
  • Hormonal dysregulation
  • Inferior limb pathology
  • Neuromuscular pathology
  • History of tabacco or alcool abuse
  • Oxygen dependent
  • Recent exacerbation (2 months) of the symptoms of COPD

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: Basic Science
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Post-exercise signaling proteins phosphorylation level in the quadriceps of COPD patients and age-matched healthy controls
Time Frame: 2 hours post-exercise
Phosphorylation status of key proteins (Akt, p70, mTOR, p38, JNK, ERK) will be lesser modulated in the quadriceps of patients with COPD compare to healthy controls. The phosphorylated as well as the total protein levels will be measured by western blot. The data will be presented as arbitrary units and compared with values obtained in healthy age-matched healthy controls.
2 hours post-exercise

Collaborators and Investigators

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

Sponsor

Laval University

Collaborators

Canadian Institutes of Health Research (CIHR)

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

October 1, 2009

Primary Completion (Actual)

April 1, 2013

Study Completion (Actual)

April 1, 2013

Study Registration Dates

First Submitted

March 20, 2012

First Submitted That Met QC Criteria

March 21, 2012

First Posted (Estimate)

March 23, 2012

Study Record Updates

Last Update Posted (Estimate)

May 7, 2013

Last Update Submitted That Met QC Criteria

May 3, 2013

Last Verified

May 1, 2013

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • SIM-COPD-20458

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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