- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00945256
Muscle Perfusion and Protein Metabolism in Elderly
January 5, 2016 updated by: The University of Texas Medical Branch, Galveston
A Phase I Trial Examining Muscle Perfusion and Protein Metabolism in Elderly and Young
The purpose of this study was to examine the role skeletal muscle perfusion plays in mediating muscle protein synthesis in healthy older and younger individuals.
The investigators hypothesized that normalization of muscle perfusion in older men and women via exercise or infusion of a vasodilator would enhance nutritive flow and skeletal muscle protein synthesis in the elderly similar to that of their younger counterparts.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Detailed Description
The purpose of this study was to examine muscle protein metabolism in healthy young and elderly subjects during pharmacologic vasodilation of the lower limb vasculature in combination with increased amino acids delivery.
We obtained femoral arteriovenous blood samples and v. lateralis muscle biopsies during a primed continuous infusion of L-[ring-13C6] Phenylalanine.
Muscle protein kinetics were measured in the basal state and during a 180 min infusion of sodium nitroprusside (SNP) and amino acids (Premsol 10%) (SNP+AA).
Skeletal muscle microvascular recruitment and flow were measured during the basal state and SNP+AA using contrast-enhanced ultrasound (CEU).
Study Type
Interventional
Enrollment (Actual)
62
Phase
- Phase 1
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
18 years to 85 years (Adult, Older Adult)
Accepts Healthy Volunteers
Yes
Genders Eligible for Study
All
Description
Inclusion Criteria:
All inclusion criteria must be fulfilled throughout the study. At enrollment, subjects must fit the following criteria:
- Age: young 18-40 yrs; elderly 60-85 yrs.
- Availability of transportation (i.e., subjects must be able to provide their own transportation to UTMB).
- Ability to sign informed consent (score >24 on 30 item mini-mental status exam and no errors on assessment of judgment).
Exclusion Criteria:
None of the following exclusion criteria should be present at enrollment or throughout the study:
- Patients with limiting or unstable angina or who demonstrate cardiac abnormalities such as > 0.2 mV horizontal or downsloping ST segment depression, frequent arrhythmias (>10 PVC/min), or valvular disease.
- Any patient with atrial fibrillation, history of syncope, angina, or congestive heart failure.
- Patients with vascular disease, as determined by the presence of risk factors of peripheral atherosclerosis (i.e., hypertension, obesity, uncontrolled diabetes, and evidence of venous or arterial insufficiency upon palpation of femoral, popliteal, and pedal arteries).
- Peripheral vascular disease as determined by history or abnormal ankle-brachial index by Doppler (< 1.0).
- Any subject with blood pressure on three consecutive measurements taken at rest on separate occasions that has a systolic pressure >170 mm Hg or a diastolic blood pressure >100 mm Hg will be excluded. Subjects will not be included if they are taking blood pressure medication and have a blood pressure above these criteria.
- Any person HIV-seropositive, with active hepatitis, or any other immunosuppressive or autoimmune disease.
- Any patient taking beta blockers, vasodilators, angiotensin-converting enzyme inhibitors, calcium channel blockers, or alpha blockers.
- Any patient with uncontrolled metabolic diseases including any patient with liver or renal disease.
- Glucose intolerance: fasting plasma glucose concentration 110-126 mg/dL (6.1-7 mmol/L) and/or 2-h plasma glucose 140-200 mg/dL (7.8-11.1 mmol/L) during oral glucose tolerance test (OGTT).
- Currently in muscle strengthening program.
- Total knee replacement or moderate to severe degenerative joint disease of knees.
- Anemia (hemoglobin <13 g/dL in males or <12 g/dL in females).
- Any history of hypo- or hyper-coagulation disorders, including patients taking Coumadin or with a history of deep venous thrombosis (DVT) or pulmonary embolism (PE) at any point in their lifetimes.
- Currently taking aspirin and cannot stop for 7 days (i.e., medical indication for continued aspirin such as transient ischemic attacks).
- Presence of acute illness or metabolically unstable chronic illness.
- Heart disease requiring therapy or recent myocardial infarction (less than 1 year)
- Currently on weight-loss diet.
- Active cancer or in short-term remission (less than 3 years).
- Alcohol or drug abuse.
- History of >20 packs per year cigarette smoking.
- Recent (within 6 months) ingestion or injection or transdermal administration of anabolic steroids, corticosteroids, estrogens, or progestagens.
- History of falls (1 fall in the past year which required medical attention, or more than 2 falls/year regardless of severity).
- Allergy to iodides, penicillin or shellfish.
- Any subject with a know hypersensitivity to octafluoropropane.
- Any subject with a cardiac shunt.
- Any subject with chronic obstructive pulmonary disease (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
- Allocation: Randomized
- Interventional Model: Factorial Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: Young Aerobic Exercise
45 minutes of treadmill walking at 40% VO2 peak
|
45 minuties of treadmill walking was completed at 40% VO2 peak
|
Active Comparator: Elderly Aerobic Exercise
45 minutes of treadmill walking at 40% VO2 peak
|
45 minuties of treadmill walking was completed at 40% VO2 peak
|
Active Comparator: Young Sodium Nitroprusside
Sodium Nitroprusside given in a constant infusion for 180 minutes at a rate of 0.114 ug/kg/min
|
Sodium Nitroprusside was given in a constant infusion for 180 minutes at a rate of 0.114 ug/kg/min
Other Names:
|
Active Comparator: Elderly Sodium Nitoprusside
Sodium Nitroprusside given in a constant infusion for 180 minutes at a rate of 0.114 ug/kg/min
|
Sodium Nitroprusside was given in a constant infusion for 180 minutes at a rate of 0.114 ug/kg/min
Other Names:
|
Active Comparator: Elderly Sodium Nitroprusside and Amino Acid Drink
Sodium Nitroprusside given in a constant infusion for 180 minutes at a rate of 0.114 ug/kg/min and 7.5g amino acid drink taken orally
|
Sodium Nitroprusside was given in a constant infusion for 180 minutes at a rate of 0.114 ug/kg/min
Other Names:
7.5 gram Amino Acid drink
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Mixed Muscle Fractional Synthesis Rate (FSR)
Time Frame: Acute ( 8 hours)
|
The rate at which the body makes new muscle was assessed by determining the fractional synthesis rate (FSR).
This technique determines how quickly new amino acids are used to make muscle.
In this technique, a special (but natural and non-radioactive) version of an amino acid is infused into the blood.
This special version of the amino acid is heavier than the most common version the same amino acid.
This property allows it to be identified in a muscle sample.
By determining how much of the special amino acid has accumulated over time in a muscle sample, the fractional synthesis rate can be determined.
For example, if the rate were such that 1 of every 100 amino acids were of the special type after 1 day, the fractional synthesis rate would be 1% per day.
In other words, 1/100 of the muscle would be newly made each day.
|
Acute ( 8 hours)
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Collaborators
Investigators
- Principal Investigator: Melinda Sheffield-Moore, PhD, UTMB
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
May 1, 2003
Primary Completion (Actual)
May 1, 2008
Study Completion (Actual)
May 1, 2009
Study Registration Dates
First Submitted
July 22, 2009
First Submitted That Met QC Criteria
July 23, 2009
First Posted (Estimate)
July 24, 2009
Study Record Updates
Last Update Posted (Estimate)
February 3, 2016
Last Update Submitted That Met QC Criteria
January 5, 2016
Last Verified
April 1, 2014
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 03-213
- R01AG021539 (U.S. NIH Grant/Contract)
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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