Skeletal Muscle Protein Synthetic Response to Amino Acid and Peptides

Inclusion Criteria: * Recreationally-active adults: ≥ 30 min of physical activity at moderate intensity ≥ 3 times per week * Ages: 18-35 years old * English fluency Exclusion Criteria: * Tobacco, nicotine (patch/gum) use (previous 6 mo) * Alcohol consumption \>10 drinks per week * Metabolic disorders (e.g., Metabolic Syndrome, Diabetes, thyroid diseases) * Cardiovascular disease, arrhythmias * Hypogonadism * Asthma * History of uncontrolled hypertension * Orthopedic injury/surgery (within 1 yr) * Hepatorenal, musculoskeletal, autoimmune, or neurological disease * History of neuromuscular problems * Previous participation in amino acid tracer studies * Predisposition to hypertrophic scarring or keloid formation * Consumption of ergogenic-levels of dietary supplements that may affect muscle mass (e.g., creatine, HMB), insulin-like substances, or anabolic/catabolic pro-hormones (e.g., DHEA) within 6 weeks prior to participation * Consumption of thyroid, androgenic, or other medications known to affect endocrine function * Consumption of medications known to affect protein metabolism (e.g., prescription-strength corticosteroids, non-steroidal anti-inflammatories, or acne medication) * Currently pregnant