Core PWO


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Chocolate Brownie Batter, Peanut Butter Toffee

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It has been called the most important meal of the day, “the anabolic window,” and eating for anabolism. Whatever name you give it, the premise remains: post workout (PWO) nutrition is crucial to reaching your fitness and physique goals. Post workout nutrition plays a number of critical anabolic (tissue building) functions, chief among them the maximization of glycogen storage and protein synthesis, while simultaneously minimizing protein breakdown and the excessive release of catabolic (tissue destroying) hormones.  Incomplete or insufficient PWO nutrition is like fueling your new Maserati with regular unleaded – you simply don’t do it.

This all raises the question: what is the ideal post workout nutrition? Is it well known, or a secret? Maybe a certain ratio of carbohydrates to protein, or fat to protein; maybe the timing and frequency? In fact, the situation is vastly less complex, more well-known, and easier to implement than most would have you believe.

High quality, fast-acting carbohydrates and protein have been shown time and again to induce the most optimal conditions for growth in clinical studies – and that is precisely what Core has attempted to emulate with Core PWO. Core PWO takes the guesswork out of post workout recovery, containing the fast-acting proteins and carbs (whey isolate, dextrose, Carb10™ and Cluster Dextrin®), along with other anabolic agents (free-form L-Leucine and Velositol®) needed to maximize muscle recovery after weight training. These ingredients quickly replenish muscle glycogen and shuttle much needed amino acids to muscle cells. Whether you are bulking up or slimming down, all of these ingredients are crucial for proper recovery.

Full Science

Physiological Properties and Effects:

Recovery Carb Blend (Dextrose, Carb 10™ and Cluster Dextrin®):

As mentioned above, one of the main goals post workout is to restore muscle glycogen that has been depleted during the workout. The body will even break down muscle tissue for this purpose if an adequate influx of glucose – obtained from the consumption of carbohydrates – is not provided. For this reason, it is vital to include carbohydrates in the post-workout drink.

Though opinion varies, the scientific literature is relatively clear that fast–digesting carbohydrates such as dextrose, Carb 10™, and Cluster Dextrin® create optimal conditions for the post-workout synthesis of both skeletal muscle protein and muscle glycogen. Not only have all three of Core PWO’s carbohydrates sources demonstrated higher rates of post-exercise glycogenesis (glycogen resynthesis) as compared to other carbohydrate sources, they have also been shown to optimize insulin response and blunt cortisol release to a greater degree than other carbohydrate sources.

Dextrose functions at such a higher capacity because of molecular structure, given that it is otherwise known as pure glucose – your body’s preferred energy substrate and the necessary component for the synthesis and resynthesis of glycogen. Bypassing the lengthy and metabolically costly process of digestion and breakdown, dextrose can be absorbed directly through the gut into the bloodstream and can cause an insulin response faster than any other carb. Additionally, since dextrose is already in the form the body requires, it can be used immediately for glycogen replenishment.

Carb10™ is an entirely different creature, which functions in PWO to round out the insulin response. Created not from maltodextrin or glucose, but rather peas, Carb10™ is a clean and sustained means of providing your body with its nutritional needs in the post workout environment. Carb10™ also possesses low osmolality, a term used to describe the concentration of a solution. In this case, low osmolality means that Carb10’s transit through the stomach and into the intestine’s is both quicker and more efficient than other carbohydrates sources – meaning it delivers nutrients quickly, while still being low glycemic and reducing bloat. Think of it like other carbohydrates causing a traffic jam, while Carb10™ cruises through the carpool lane.

In total, Carb10™ possesses a wide range of benefits. Including:

  • Minimal blood-sugar and insulin response
  • Fast gastric-emptying formula reduces bloating
  • Low osmolality
  • Prebiotic, non-allergenic, non-GMO and gluten-free.

Cluster Dextrin®, the last of PWO’s carb sources, is derived from corn. Though dissimilar in molecular structure and source from Carb10™, it’s similar in terms of its low osmolality leading to expedient stomach clearing and low bloating. Research conducted on top swimmers, swimming in a flowing water pool, confirmed that Cluster Dextrin’s fast gastric emptying contributed to increased endurance (longer swim times). Swimmers provided a sports drink containing Cluster Dextrin had approximately 50% longer swim time than swimmers provided a mixture of water and glucose only.

In combination, the carbohydrates in Core PWO, in their precise serving sizes, interact to form a comprehensive post-workout nutrition strategy:

  • Dextrose acts quickly to create an immediate supply of glucose and to stimulate post-workout insulin levels.
  • Due to their molecular structure, Carb-10™ and Cluster Dextrin balance that insulin response.
  • Together, they all rapidly, and in a sustained fashion, provide your body with a prime environment for the synthesis of both glycogen and skeletal muscle
  • And most importantly, they do so without the bloat!

Clinical research is clear that carbohydrates of this type, in combination with whey protein isolate, rapidly reverse high levels of cortisol and low levels of insulin that are associated with high intensity exercise. The rapid, but very beneficial, influx of glucose from oral carbohydrate supplementation quickly suppresses cortisol and the negative effect it has on the expression of metabolically critical proteins and growth factors – ensuring that myocytes (muscle cells) function in an ideal environment. In addition, these carbohydrates induce a beneficial insulin response, the effects of which include stimulating glycogen storage, the transport of glucose into muscle cell mitochondria, and an increase in amino acid utilization.

Cold-Processed Microfi­ltered Non-GMO Whey Protein Isolate:

If the post-workout environment were a jungle, whey protein isolate would be the lion – its king. While it is difficult to overstate the critical role that post-exercise protein consumption plays in both a macro (body composition) and micro (small-scale, physiological changes) context, some ambiguity remains: what is the ideal form, frequency, timing, and amount of protein consumption post-exercise? Luckily for you, Core Nutritionals’ research hounds have crunched the numbers and read the studies for you, and the result is a very precise amount of whey protein isolate included in Core PWO.

In a statement that should not surprise a single athlete or casual weightlifter, intense resistance training has a profound effect on the function and structure of skeletal muscle and muscle proteins. Immediately following an intense bout of resistance exercise, a process known as muscle protein breakdown – with its sidekick, leucine oxidation – begin to literally tear down your skeletal muscle from the inside. While resistance training simultaneously increases a process known as protein synthesis, the fractional synthesis rate (how quickly the protein is synthesized) is often far exceeded by the rate of muscle protein breakdown and leucine oxidation. The result is that, in that absence of mitigating factors such as post-workout nutrition, your body is in a state of negative protein balance – i.e., catabolism.

In order to counteract a negative intramuscular protein balance, a number of things need to occur – mostly, a rapid increase in the availability of amino acids, and the optimization of several metabolically critical hormones (such as insulin). The combination of protein and carbohydrates contained in Core PWO achieves precisely this balance, and research on whey protein and dextrose in combination demonstrates that this combination maximizes the stimulation of muscle protein synthesis and results in even greater muscle anabolism than either alone.

Free Form Leucine:

The branch-chained amino acids leucine, isoleucine, and valine are famous for their role in skeletal muscle protein synthesis and metabolism, and additionally comprise approximately one-third of all skeletal muscle protein. Of the three, leucine is both the most physiologically important with respect to muscle mass, and the most extensively studied. Data on leucine demonstrate this amino acid plays critical roles in stimulating skeletal muscle protein synthesis, and ribosomal biogenesis and assembly (the literal building of muscle tissue), along with playing a lesser role in insulin signaling and gluconeogenic processes. As a result of these diverse roles, leucine has been demonstrated to significantly stimulate skeletal muscle protein synthesis, and attenuate protein degradation, by both insulin-mediated and non-insulin mediated mechanisms.

Leucine’s insulin-mediated effects are largely the result of its activation of the classical insulin receptor substrate (IRS)/phosphatidylinositol (PI) 3-kinase (PI3K)/Akt/mTOR signal transduction pathway. In this pathway, the bonding of a substrate (Insulin activates a compound known as PI3K, which in turn activates, Akt. Once phosphorylated and activated, Akt signals the release of the famous mammalian target of rapmycin (mTOR). mTOR then increases the translation of muscle-cell ribosomal proteins that increase ribosome biogenesis, which is the literal production of proteins. Leucine plays a critical role in all of this, creating the translation initiation factors that are the rate-limiting step in the production of the ribosomes spoken about above. Carbohydrates alone, other essential amino acids, and non-essential amino acids have not been shown to have the stimulatory effects on muscle protein synthesis – leucine alone has, highlighting is primacy as a muscle protein activator. Leucine has additionally been shown to positively regulate protein synthesis independent of insulin. In certain trials where rapamycin and leucine were co-administered, rapamycin showed only partial inhibition of leucine’s effects on muscle protein synthesis. Rapamycin is also a critical component to the PI3K/Akt/mTOR pathway, as the mTOR (mammalian target of rapamycin) suggests. One of rapamycin’s primary functions is to inhibit mTOR. So, if leucine-mediate protein synthesis is only partially blocked by rapamycin, but rapamycin fully inhibits mTOR, this suggests that leucine-mediate protein synthesis is only partially dependent on the PI3K pathway.


Velositol™, a patented complex of amylopectin/chromium, is a fascinating compound – with emerging clinical data to suggest that it is effective in significantly enhancing skeletal muscle protein synthesis when combined with whey protein (vs whey alone).

In a double-blind crossover study, featuring 10 exercise-trained adults, researchers combined Velositol™ with 6g of whey protein to measure what effects, if any, the compound would exert on skeletal muscle protein synthesis. (The control group consumed 6g of whey alone.) After collecting baseline muscle biopsies – to measure phenylalanine, a marker of muscle-building – the subjects performed eight reps of leg extensions. A final muscle biopsy was taken post-workout, to measure the changes in muscle protein synthesis between the study and control group.

The results were significant: the researchers found that muscle protein synthesis had nearly doubled in the Velositol™ group, compared to the control. The researchers hypothesized that the mechanism of action of Velositol is the stimulated uptake of leucine and other amino acids due to an influx of insulin (from the chromium).

While further study is warranted, the existing data on Velositol™ suggests it’s a must-have addition to any recovery matrix.

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