Maximizing Post-exercise Anabolism: The Case for Relative Protein Intakes.
Level 5 - mechanism / opinion, no new human data
Narrative review and secondary re-analysis without systematic review protocol
PubMed 31552263 · doi:10.3389/fnut.2019.00147
What was done
The authors reviewed and re-analyzed published dose-response literature on post-exercise dietary protein ingestion in young adults to evaluate whether post-exercise protein guidelines should be expressed relative to body mass rather than as a fixed absolute dose.
What was found
Re-analysis of published data indicates that a relative intake of ~0.31 g/kg of rapidly digested, high-quality protein (such as whey) maximizes post-exercise myofibrillar protein synthesis while minimizing excess amino acid oxidation in young adults of average body composition, compared to standard absolute 20 g recommendations for ~80 kg males. This is lower than the dose reported to maximize whole-body anabolism (≥0.5 g/kg). The review notes that sex, carbohydrate co-ingestion, and active muscle mass do not substantially alter this relative target.
Why it matters
It provides a scalable, body-weight-adjusted guideline (~0.31 g/kg) for post-exercise protein ingestion rather than relying on a uniform absolute bolus recommendation.
Limits
The abstract describes a narrative review and re-analysis without specifying systematic search parameters, sample size, or number of studies. Recommendations are restricted to young adults consuming rapidly digested animal protein and cannot be directly generalized to plant proteins, older adults, individuals with obesity, endurance exercise, or energy-restricted states.
Cited by
- supports A single meal containing 20 grams of high-quality protein maximizes muscle protein synthesis for up to 4 to 6 hours.