Effect of Tyrosine on Behavioral, Physiological and Nutritional Status During Survive, Evade, Resist, Escape (SERE) School

United States Army Research Institute of Environmental Medicine

Status: Completed

Conditions: Response to Severe Stress

Treatments: Other: Placebo Bar; Other: Tyrosine-Containing Bar

Study type: Interventional

Funder types: Other U.S. Federal agency

Identifiers

NCT01823276

12-43 HC

Details and patient eligibility

About

The objective of the proposed research is to determine if tyrosine, an amino acid found in protein-containing foods, will mitigate the cognitive deficits and adverse effects on behavior and mood produced by exposure to military stress. This study will be conducted at the Army Survive, Evade, Resist, Escape (SERE) school at Fort Bragg, NC.

Tyrosine is the dietary precursor of the catecholamine norepinephrine, a key brain neurotransmitter that is critical for the central nervous system (CNS) response to various types of acute stress. Psychological stress increases catecholamine turnover in the brain, increasing the requirement for tyrosine to support synthesis of norepinephrine. Animal and human studies have shown that tyrosine supplementation can produce beneficial effects on cognitive and physiological functions during exposure to a variety of acute stressors.

This project will determine if volunteers treated with supplemental tyrosine during stressful phases of SERE training experience less degradation in cognitive performance and mood than volunteers treated with placebo. Tyrosine or placebo will be administered in a specially developed food bar provided to volunteers. The bar is part of a prototype of ration-component designed for use during assault operations. A between-subjects, double blind experimental design will be employed. Tyrosine, an amino acid found in most protein-containing foods, has been tested in hundreds of volunteers without adverse effects.

Approximately 100 volunteers will be recruited from several SERE classes to ensure up to 82 volunteers complete the study. They will be tested during several portions of SERE. A comprehensive but brief battery of cognitive tests, as well as saliva and blood samples, will be collected in a manner that does not interfere with ongoing training.

Hypotheses:

1. The adverse effects of psychological stress on cognitive performance and mood during SERE school will be reduced when volunteers are given supplemental tyrosine compared to placebo treatment.
2. Supplemental tyrosine will reduce release of proinflammatory cytokines that may be increased by the stressful activities of SERE school.

Enrollment: 73 patients

Sex: Male

Ages: 18 to 39 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• MUST BE ACTIVE DUTY ARMY SOLDIERS ENROLLED IN SPECIAL FORCES TRAINING AT US ARMY SERE SCHOOL
• Fluent in English (non-native English speakers can be enrolled)

Exclusion criteria

• Allergy to dairy products
• blood donation within 8 weeks of study start

Trial design

73 participants in 2 patient groups, including a placebo group

Tyrosine-Containing Bar

Active Comparator group

Description:

150 mg/kg dose of tyrosine per administration, administered twice

Treatment:

Other: Tyrosine-Containing Bar

Placebo Bar

Placebo Comparator group

Description:

0 mg/kg dose of tyrosine per administration, administered twice

Treatment:

Other: Placebo Bar