We all know post-exercise re-feeding is crucial to reap the benefits of training, particularly high-intensity exercise. In a recent study conducted by Lynch et al. (2012), VPX Protein Rush® was compared to an isocaloric “ade” (iCHO) on performance indices following high-intensity resistance training (HIRT..pun intended!). The goal was to determine which macronutrient drink supported repeated performance. 
Fifteen healthy, 21-44 year old male subjects performed a 15-18 minute HIRT workout then immediately drank either VPX or iCHO. Following a two hour fast, the subjects performed an agility T-test, push-up test, 40-yard sprint, and reported rate of perceived exertion. After a one-week washout the subjects repeated the protocol with the opposite treatment (they acted as their own controls). While controlling for caloric intake and energy expenditure, it was found that VPX produced a significantly (p < .01) larger interaction effect between the performance tests following glycogen depleting exercise compared to iCHO. The RPE effects were similar between the two drinks.
What does this mean? VPX Protein Rush® contains a proprietary bioactive protein blend with seven protein complexes including: calcium caseinate, milk protein isolate, whey protein concentrate, micellar casein, whey protein isolate, casein hydrolysate di- and tri-peptides, and whey protein hydrolysate di- and tri-peptides. Whey protein is a fast-acting protein and casein is a slow-releasing protein shown to reduce muscle breakdown. The hydrolysate protein forms are predigested proteins that are easier to metabolize and may be less allergenic for some individuals. This exclusive blend also contains copious amounts of calcium and vitamin D, which aid in muscle protein synthesis. In addition, some amino acids can provide the substrates necessary to manufacture glucose (through gluconeogenesis), which is necessary to replenish glycogen stores after an exhaustive workout. Collectively, this formula provides a robust source of vitamins, minerals, fiber, and protein to trigger and sustain metabolism, protein accretion, and support repeated activity—specifically activity that comprises a variety of energy systems and neuromuscular demands. Although iCHO drinks are effective in replenishing glycogen post-exercise, these solutions lack the building blocks for muscle protein synthesis and other factors that reduce inflammation and catabolism.
So, when in doubt—Protein Rush® for repeated bouts!
This is a guest post written by Dr. Shannan Lynch. She is the Director of Education for Mad Dogg Athletics in Venice, CA. Her academic background is nutrition and exercise science and she holds multiple fitness certifications.
Lynch, S., Rhea, M., Hegamin, A., Turbow, D. (2012). Comparing the effects of VPX Protein Rush™ and isocaloric carbohydrate drink on performance indices following high-intensity resistance training. (Doctoral dissertation). Trident University, Cypress, CA.
