Year: 2021
Type: dissertation
Study design: Clinical Trial
Abstract: Leucine-enriched proteins (e.g., dairy) are more effective than plant-based sources for supporting post-exercise rates of muscle protein synthesis in adults. However, the impact of protein quality on protein synthesis and acute markers of growth in active children are unknown. Using a randomized crossover design, eight children completed three metabolic trials providing 0.32g/kg FFM of either milk protein concentrate (MPC), rice protein isolate (RPI), or soy protein isolate (SPI) following a bout of variable intensity exercise with whole-body protein kinetics (i.e., oxidation, synthesis, breakdown, and net balance) determined by oral [13C]phenylalanine tracer methodology. Although phenylalanine oxidation was not different between protein sources, protein synthesis was greater with MPC compared to SPI and RPI. In contrast, RPI ingestion apparently attenuated breakdown rates compared to MPC and SPI. MPC and RPI ingestion resulted in greater net-protein balance compared to SPI. Although post-exercise protein ingestion is critical to support anabolism, our results indicate that protein quality may be a consideration for children.
Source: TSpace (University of Toronto)
Author: Fung, Hugo Jern Wai
Language: English
Subfield: Nutrition and Dietetics
Field: Nursing
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W7132898905