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Essential Amino Acids Supplementation and Muscle Protein Synthesis

Information source: United States Army Research Institute of Environmental Medicine
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Muscle Loss; Muscle Anabolism

Intervention: Essential Amino Acids (Dietary Supplement); Endurance exercise (Other)

Phase: Phase 1/Phase 2

Status: Completed

Sponsored by: United States Army Research Institute of Environmental Medicine

Official(s) and/or principal investigator(s):
Stefan M Pasiakos, Ph.D., Principal Investigator, Affiliation: US Army Research Institute of Environmental Medicine


The modern warfighter faces numerous physiological challenges including sleep deprivation, sustained intense physical activity, and caloric restriction, the combined effects of which may result in the loss of lean body mass and decreased physical performance. Dietary interventions may help preserve lean body mass and facilitate recovery from periods of intense physical demand. For example, dietary strategies that increase amino acid availability have been shown to stimulate protein synthesis in skeletal muscle following resistance exercise. Because military tasks also incorporate endurance exercise components, studies regarding the effects of increasing dietary amino acids following endurance exercise are warranted. The objectives of this study are to characterize the effect of endurance exercise on protein synthesis and breakdown as well as the ability of an essential amino acid supplement to influence skeletal muscle protein metabolism and its cellular and molecular regulation following endurance exercise.

Clinical Details

Official title: The Effect of Amino Acid Supplementation on Skeletal Muscle Protein Turnover Following Endurance Exercise

Study design: Allocation: Randomized, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Outcomes Assessor), Primary Purpose: Basic Science

Primary outcome: Change in muscle protein synthesis after exercise or exercise with amino acid supplementation.

Secondary outcome: Change in intracellular signaling after exercise or exercise with amino acid supplementation.


Minimum age: 18 Years. Maximum age: 35 Years. Gender(s): Both.


Inclusion Criteria:

- Men and women aged 18 - 35 years

- Weight stable

- Recreationally active with VO2max of 40 - 50 ml/kg/min

- Refrain from taking any NSAIDS or any aspirin-containing medications

- Supervisor approval if a federal employee

Exclusion Criteria:

- Disease or medication that affects macronutrient metabolism and/or the ability to

participate in strenuous exercise

- Allergies to foods or medications (including, but not limited to, lidocaine or

phenylalanine) to be utilized in the study

- Abnormal PT/PTT test or problems with blood clotting

- Present condition of alcoholism or other substance abuse that compromises exercise


- Musculoskeletal injuries that compromise the ability to exercise

- Pregnancy

Locations and Contacts

Tufts University, Boston, Massachusetts 02111, United States

US Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760, United States

Additional Information

Starting date: May 2007
Last updated: June 2, 2011

Page last updated: August 23, 2015

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