Exercise and Branched Chain Amino Acids (BCAA)Requirements in Older Men

Can Branched Chained Amino Acid Supplementation Combined With Strength-Training Minimize Sarcopenia in Older Men?

Likely, branched chain amino acid (BCAA) requirements are increased in older strength-trained (ST) individuals. If so, supplementation in this group will maximize muscle protein synthesis (MPS) and minimize loss of muscle with age (sarcopenia).

We hypothesize that the dietary requirement for the branched chain amino acids (BCAA) in an older strength-trained (ST) population will be greater than the current recommendation (RDA). If so, a greater intake of BCAA together with ST is necessary if one aims to maximize muscle protein synthesis (MPS). Currently, the BCAA requirement in the ST older population (55-65 y) is unknown. This is critical information especially given the value of ST for overall health.

Inclusion Criteria:

• Recreationally active (~2-3 h/wk of physical activity) healthy older men (55-65 y)
• A minimum of 4 month weight training experience

Exclusion Criteria:

• Have symptoms or take medication for respiratory disease
• Have symptoms or take medication for cardiovascular disease
• Have symptoms or take medication for metabolic disease
• Have symptoms or take mediation for neuromuscular disease
• Use heart rate or blood pressure medications
• Use any medications with side effects of dizziness, lack of motor control, or slowed reaction time
• Have an excessive alcohol intake (more than 2 drinks per day)
• Have any cardiovascular or neuromuscular limitations to exercise
• Are allergic to milk or milk products
• Use anabolic steroids or performance enhancing drugs