Translational Control of Anabolic Resistance in Aging Muscle

Not Applicable

Completed

• Conditions: Physical Inactivity
• Interventions: Other: Reduced Physical Activity

• Registration Number: NCT03839628
• Lead Sponsor: University of Utah

Brief Summary

This is an interventional study enrolling older individuals aged 60-85y to observe changes during physical inactivity. This study is investigating the relation between short-term physical inactivity and the impact of muscle health and function. The enrollment goal is 8 participants. The study will occur over the course of a month where participants will undergo testing before and after a reduction in physically activity levels. There will be a screening event collecting baseline data, two body composition scans, muscle function and oral glucose tolerance tests and a metabolic study before and after a 2-week period of inactivity. Each metabolic study will entail three-muscle biopsies: one before and 2 after the ingestion of leucine.

Detailed Description

Pre-testing- The baseline evaluation will assess muscle function and strength, and an oral glucose tolerance test. After the baseline visit, participants will be provided with a step activity monitor to track their level of activity. This will provide a baseline of the participant's normal level of physical activity so an accurate level of 75% activity reduction can be determined. A 3-day daily dietary diary will be provided for the participant to self-report prior to the experiment, as well.

Day 1- After the participant completes their normal activity log and dietary diary, they will be asked to return to the research center for a body composition scan and a metabolic study.

The metabolic study will involve blood sampling from an arm vein and muscle biopsies from the thigh before and after a leucine drink.

2-week period of inactivity- After the metabolic study, the participant will return home and maintain a reduced level of activity (75% reduction) for a two-week period. During this time, the participant will receive phone calls from research personnel in order to maintain adherence to the intervention.

Day 14- After the 2-week reduced activity period, the participant will return to the research center to receive a body composition scan and undergo a metabolic study identical to 'Day 1'.

Post-testing- After Day 14, the participant will be asked to return once again to the research center for a oral glucose tolerance test and the exercise lab for muscle function testing.

Study Timeline

• Study First Submitted: 2019-02-11
• Study First Submitted QC: 2019-02-12
• Study First Posted: 2019-02-15
• Study Start: 2019-03-05
• Primary Completion: 2019-12-17
• Study Completion: 2019-12-17
• Results First Submitted: 2022-05-03
• Results First Submitted QC: 2022-05-31
• Status Verified: 2022-06
• Results First Posted: 2022-06-02
• Last Update Submitted: 2022-06-17
• Last Update Posted: 2022-06-22

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 9

Inclusion Criteria

• Age between 60-85 years
• Ability to sign informed consent
• Free-living, prior to admission

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Exclusion Criteria

• Cardiac abnormalities considered exclusionary by the study physician (e.g., Chronic heart Failure, right-to-left shunt)
• Uncontrolled endocrine or metabolic disease (e.g., hypo/hyperthyroidism, diabetes)
• History of kidney disease or failure
• Vascular disease or risk factors of peripheral atherosclerosis. (e.g., uncontrolled hypertension, obesity, diabetes, hypercholesterolemia > 250 mg/dl, claudication or evidence of venous or arterial insufficiency upon palpitation of femoral, popliteal and pedal arteries)
• Risk of blood clotting including family history of thrombophilia, pulmonary emboli, myeloproliferative diseases including polycythemia (Hb>18 g/dL) or thrombocytosis (platelets>400x103/mL), and connective tissue diseases (positive lupus anticoagulant), hyperhomocystinemia, deficiencies of factor V Leiden, proteins S and C, and antithrombine III
• Use of anticoagulant therapy (e.g., Coumadin, heparin)
• Elevated systolic pressure >150 or a diastolic blood pressure > 100
• Cancer or history of successfully treated cancer (less than 1 year) other than basal cell carcinoma
• Implanted electronic devices (e.g., pacemakers, electronic infusion pumps, stimulators)
• Currently on a weight-loss diet or body mass index > 30 kg/m2
• Chronic systemic corticosteroid use (≥ 2 weeks) within 4 weeks of enrollment and for study duration (intra-articular/topical/inhaled therapeutic or physiologic doses of corticosteroids are permitted). Androgens or growth hormone within 6 months of enrollment and for study duration (topical physiologic androgen replacement is permitted)
• History of stroke with motor disability
• A recent history (<12 months) of GI bleed
• History of liver disease
• History of respiratory disease (acute upper respiratory infection, history of chronic lung disease)
• Prior history of Heparin-Induced Thrombocytopenia
• An HbA1c value at or greater than 6.5%
• Any other condition or event considered exclusionary by the PI and faculty physician

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Reduced Physical Activity	Reduced Physical Activity	Participants will reduce their physical activity levels for 2-weeks by approximately 75% of their baseline level of physical activity

Primary Outcome Measures

Name	Time	Method
Lean Mass	baseline and 2-weeks	Change in lean mass
Strength	baseline and 2-weeks	Change in muscle strength

Trial Locations

Locations (1)

University of Utah; 🇺🇸 Salt Lake City, Utah, United States