Healthy, Increased Metabolic Requirement
Conditions
Brief summary
Protein requirements in individuals who participate in endurance-based exercise training have been suggested to be greater than the current recommended dietary allowance (RDA). The biological value of protein depends on its amino acid composition. Essential amino acids are believed to have main role on whole body protein metabolism. However, it remains to be determined what role non-essential amino acids (NEAA) may have in regulating protein metabolism and contributing to the increased protein requirements after endurance exercise. The indicator amino acid oxidation (IAAO) method has clarified the individual amino acid requirement in children, normal healthy adult and clinical populations. However, the IAAO method has never been utilized for assessing the effect of NEAA on protein requirements after endurance exercise. The objective of the current study is to investigate the importance of NEAA for endurance-trained male subjects.
Interventions
DIETARY_SUPPLEMENTBASE egg protein
0.8 g/kg/d of protein provided as crystalline amino acid modeled after egg protein
DIETARY_SUPPLEMENTBCAA-enriched egg protein
BCAA-enriched egg protein provided as crystalline amino acid.
DIETARY_SUPPLEMENTsmall amount of essential amino acids
essential amino acids modeled after egg protein, provided as crystalline amino acid, which is equivalent to the amount of essential amino acid in BASE egg protein
DIETARY_SUPPLEMENTlarge amount of essential amino acids
essential amino acids modeled after egg protein, provided as crystalline amino acid, which is equivalent to the amount of amino acid in BCAA-enriched egg protein
Sponsors
Ajinomoto Co., Inc.
University of Toronto
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
BASIC_SCIENCE
Masking
SINGLE (Subject)
Eligibility
Sex/Gender
MALE
Age
18 Years to 40 Years
Healthy volunteers
Yes
Inclusion criteria
* endurance-trained participants who regularly run more than 40 km/week * Participants who are categorized at least very good based on a study by Shvartz & Reibold, in which VO2peak is used as an index. (i.e. the participants whose VO2peak is ≥57 ml/kg/min (18-24 y), ≥54 ml/kg/min (25-29 y), ≥52 ml/kg/min (30-34 y), ≥49 ml/kg/min (35-39 y) * Ability to complete the 16-km familiarization run in session 2
Exclusion criteria
* Inability to meet health and physical activity guidelines according to the physical activity readiness questionnaire (PAR-Q+) * Inability to adhere to any of the protocol guidelines (i.e. alcohol, caffeine consumption) * Regular tobacco use * Illicit drug use
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| 13CO2 (carbon dioxide) excretion rate (μmol/kg/h) | at 8 hours after the end of exercise] | 8 hours after exercise followed by ingesting 13C-labelled phenylalanine and one of 5 different amount of amino acids intake, 13CO2 excretion rate is determined by multiplying the enrichment of 13CO2 in breath measured by Mass spectrometry and CO2 production rate measured by metabolic cart. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| [13C]phenylalanine oxidation rate (μmol/kg/h) | at 8 hours after the end of exercise | 8 hours after exercise followed by ingesting 13C-labelled phenylalanine and one of 5 different amount of amino acids intake, 13CO2 excretion rate is determined dividing 13CO2 excretion rate by urinary enrichment of 13C-phenylalanine in breath measured by Mass spectrometry, and CO2 production rate measured by metabolic cart. |
Outcome results
None listed