Methods In this single blind cross-over study, young male and female subjects (n=5, three males, two females; age range 18-21) consumed 40 grams of either whey (Zero Carb SRO by VPX) or soy protein
(Iso-Rich Soy by Jarrow Formulas). Subjects reported to the lab on separate days (with at least 2 days between testing sessions) and underwent 3 hours of resting metabolic rate (RMR) testing. The thermic effect of feeding (TEF) was assessed via oxygen uptake measures at baseline and 1, 2, and 3 hours post-consumption of protein. Data was collected via the ParvoMedics metabolic cart. Results A paired t-test for AUC reveled a 14.54% greater TEF for the whey protein than soy (p <0.05). The range amongst the subjects was 4.05%-23.36% greater increase in TEF. The average peak in oxygen uptake was 29.94% for whey protein and 23.98% for soy protein, respectively. Conclusion Based on this small sample size, there is evidence selleckchem to suggest that whey protein may have a greater TEF than soy.”
“Background The purpose of this study was: aim 1) compare AZD3965 insulin and leucine serum responses after feeding a novel hydrolyzed whey protein (WPH)-based supplement versus a
whey protein isolate (WPI) in rats BVD-523 in vivo during the post-absorptive state, and aim 2) to perform toxicological analysis on rats that were fed different doses of the novel WPH-based supplement over a 30-day period. Methods In male Wistar rats (~250 g, n = 40), serum insulin and leucine concentrations were quantified up to 120 min after one human equivalent dose of a WPI or the WPH-based supplement. In a second group of rats (~250 g, n = 20), we examined serum/blood and liver/kidney histopathological markers after 30 days of feeding low (1human equivalent dose), medium (3 doses) and high (6 doses) amounts of the WPH-based supplement. Results
In aim 1, leucine levels were significantly higher at 15 min after WPH vs. WPI ingestion (p = 0.04) followed by higher insulin concentrations at 60 min (p = 0.002). In aim 2, liver and kidney histopathology/toxicology Phosphoprotein phosphatase markers were not different 30 days after feeding with low, medium, high dose WPH-based supplementation or water only. There were no between-group differences in body fat or lean mass or circulating clinical chemistry markers following the 30-day feeding intervention in aim 2. Conclusion In comparison to WPI, acute ingestion of a novel WPH-based supplement resulted in a higher transient leucine response with a sequential increase in insulin. Furthermore, chronic ingestion of the tested whey protein hydrolysate supplement appears safe. Acknowledgements This study was funded in full by Scivation, Inc. The authors disclose no financial consulting benefits from Scivation, Inc. or any other companies. Serum leucine analysis was conducted at the Washington University Biomedical Mass Spectrometry Research Resource (supported by NIH Grants RR000954, DK020579 & DK056341).