The Most Underrated Post-Workout Remedy

After an intense workout, almost everyone has their recovery drink ready to go. Whether it is whey protein, a carb replacement drink, or a simple Gatorade, aggressive marketing deems these [often expensive] remedies as necessary. However, one that doesn't come with a lot of attention happens to be quite possibly the best, as well as the cheapest. I'm talking about milk! OK OK before you think I'm crazy just hear me out. If you still think I'm crazy after this article, well, post your comments and I will respectfully shut you down and prove you wrong. No I'm kidding ;) so let me know what you think! Unfortunately not everyone is able to enjoy milk post workout. As many of us age into adulthood, production of lactase, the necessary enzyme to digest the sugar in milk, decreases significantly thus causing lactose intolerance. However, if you are able to enjoy milk comfortably, then I suggest adding a healthy dose after your workout and the following is why.

Milk is an extremely good source of high quality protein and amino acids, carbohydrates, lipids, and micronutrients (e.g. Calcium and electrolytes). In addition, the fluid and electrolyte composition are important in rehydration. In one study, researchers analyzed effects of postworkout consumption of [isoenergetic, isonitrogenous, and equal macronutrient ratio] fat-free milk, fat-free soy protein, and carbohydrate drinks. They concluded that "postexercise consumption of milk promotes greater hypertrophy during the early stages of resistance training when compared with soy or carbohydrate consumption" (Hartman et al)

Milk protein is a combination of casein and whey protein. Whey has high concentrations of branched chain amino acids (BCAAs) and is more quickly digested and absorbed whereas casein is a slower digested and absorbed protein. The typical ratio of casein to whey in milk is 3:1. This is important because it causes milk to be more slowly digested and absorbed meaning blood amino acid concentrations stay higher longer. This is often the exact reasoning for supplement companies to discredit milk with their ground-breaking, faster absorbing hydrolyzed proteins. Many times I have come across the mentality that hydrolyzed proteins are better than complete proteins because they enter the bloodstream quicker and significantly increase the rate of protein synthesis. Although they do enter the bloodstream quicker than complete protein (Koopman et al), one recent study concluded that this doesn't equal better or more protein synthesis (Deglaire et al). In fact, this study actually concluded the opposite, that hydrolyzed protein is less readily absorbed, more easily used for energy, and leads to significantly less protein in the bloodstream and muscles than a complete protein.

I am not saying don't use these alternatives to milk (especially since I use Optimum Nutrition's Gold Standard Whey) but rather suggesting considering your options and goals before making a purchase. I know milk isn't as convenient as a powder, but I would definitely suggest drinking a glass of fat-free milk when you get home if you can tolerate it. If you have any questions, let me know!

References

Hartman J, et al. Consumption of fat-free fluid milk after resistance exercise promotes greater lean mass accretion than does consumption of soy or carbohydrate in young, novice, male weightlifters. Am J Clin Nutr. 2007 Aug;86(2)

Koopman R, et al. Ingestion of a protein hydrolysate is accompanied by an accelerated in vivo digestion and absorption rate when compared with its intact protein. Am J Clin Nutr. 2009 Jul;90(1)

Deglaire A, et al. Hydrolyzed dietary casein as compared with the intact protein reduces postprandial peripheral, but not whole-body, uptake of nitrogen in humans. Am J Clin Nutr. 2009 Oct;90(4)

Low Carb Dieting

If you are exercising, it is imperative that you fuel your muscles. The best way to do this is by ensuring that you eat adequate amounts of carbohydrates. I am not sure why it began, but the myth that carbohydrates are fattening is just that - a myth. As I have said before, carbohydrates are not fattening, excess calories are. Athletes are especially dependent upon carbohydrates as their muscles are constantly being used and depleted of glycogen. When you exercise hard, glycogen stores in your muscles are the main source of energy. You also have stored carbohydrates in your liver and blood (blood glucose). The liver glycogen is broken down and feeds into the bloodstream to feed your brain and muscles as well as maintain blood glucose levels. This is significant because those who are avoiding carbohydrates aren't able to maintain glycogen levels - thus directly decreasing the length and intensity of their workout. In a 2007 study, researchers had cyclists maintain a specific pedal speed until fatigue on two occasions. The first was after a 3 day low-carb diet in which they averaged about 75 minutes. The same cyclists then followed a 3 day high-carbohydrate diet and repeated the workout. This time, fatigue didn't set in until nearly 130 minutes. In conclusion, the researchers suggested that the increased glycogen levels were associated with improved performance and energy homeostasis (Green et al. 2007). It is worth noting that trained muscles have the ability to store about 20 - 50% more glycogen than that of untrained muscles (Sherman et al. 1981). I cite this because if you are just starting to exercise, simply eating a ton of carbs doesn't necessarily mean you will have incredible workouts. Rather, the take home message here is that your muscles will adapt to the training so that significantly more carbohydrates can be stored in your muscles and later used as energy. To wrap up, most exercise and health professionals suggest 55-65% of total kcals from carbohydrates for athletes. This will ensure that you are both adequately fueled for your workouts and able to replenish glycogen after exercise.

References:
Green, H., M. Ball-Burnett, S. Jones, and B. Farrance. 2007. Mechanical and metabolic
responses with exercise and dietary carbohydrate manipulation. Medicine & Science in Sports & Exercise

Sherman, W., D. Costill, W. Fink, and J. Miller. 1981. Effect of exercise-diet manipulation
on muscle glycogen and its subsequent utilization during performance. Int J
Sports Med 2:114-118.
39(1):139-148.

Lose the Carbophobia!

In the world of sports nutrition, I have encountered several different mentalities with regards to carbohydrates. High GI carbs post-workout, no carbs before bed, avoid fructose-rich fruit, carbs shouldn't be mixed with fatty meals, and my personal favorite, low-carb dieting for weight loss. All of these ideas have modest logic however little scientific evidence has supported these claims. I will briefly go over these common misconceptions and, in my next post, place special emphasis on low-carb dieting. Please email me with questions and comments. Enjoy!

Brief Breakdown of Carbohydrates
Carbohydrates are our main energy source and provide 4 Calories per gram. However, not all carbohydrates are the same. They can be classified into two categories: simple and complex. Simple carbs are mono and disaccharides and are found in table sugar, fruits, milk, honey, and prepared sugars such as high-fructose corn syrup (HFCS). Complex sugars, such as starch in plants and glycogen in muscles, are long chains of simple sugars that breakdown to release sugars. Sources include potatoes, brans, wholegrain flours, breads, and pastas, vegetables, and nuts. Another classification of carbohydrates is the Glycemic Index (GI) based on how slow or fast 50 grams (200 Calories) of that sugar will increase blood glucose levels. This system was initially used by diabetics to help control their blood glucose but many athletes have found its individual ranking of foods as a potential advantage to increase performance. In theory, low GI ranked foods consumed pre-workout help endurance athletes by providing constant energy through the slow release of glucose whereas high GI foods consumed immediately post-workout rapidly refuel depleted muscles, which brings me to my first rebuttal.

High GI Carbohydrates Post-workout
Some athletes feel that immediately after a workout it is necessary to spike insulin levels to create an anticatabolic response and re-synthesize glycogen. Unfortunately, there are flaws in this logic and research has shown that spiking insulin immediately post-workout provides no benefit. Before I continue, exists one exception for the athletes who undergo two or more exhaustive workouts within 6-8 hours of each other, however this is not the majority of us and this information may not apply to them. For the rest of us, the Glycemic Index shouldn't be stressed for several reasons. First, it is very sensitive to portion size, origin, and preparation of the food. Second, glycemic response varies greatly in each of us on a day-to-day basis. And third, well-trained muscles readily take up carbohydrates from the bloodstream (meaning insulin spikes don't necessarily occur in athletes).

No Carbohydrates After 9PM
One persistent theme I have encountered is that carbohydrates at night or before bed can lead to weight gain. This is silly in my opinion as the real culprit of weight gain is simply excess calories, not carbohydrates before bed. This is especially the case for those who train in the evenings whose muscles could properly recover from the post-workout carbs. One thing to keep in mind is that much more importantly than the timing of when to eat your carbohydrates, is actually meeting your estimated daily needs (see first post).

Avoid Fructose-Rich Fruit
I continue to be amazed when I hear people say to avoid fruit because of its fructose content. In this popular youtube video Dr. Lustig of UCSF goes as far as to associate fructose with poison. On a sidenote, if you watch this long video, I encourage you not to make any grand realizations. Nonetheless, fructose has been under a lot of scrutiny and since fruit contains relatively high amounts of fructose (about 6-7 grams), many bodybuilders see fit to avoid it. This is because fructose causes minimal insulin secretion and can potentially lead to fat synthesis in the liver. The problem here is that very rarely is fructose alone in foods. For example, all of that HFCS in our food contains almost equal ratios of glucose to fructose. Also, In many fruits, there is about a 1:1 fructose to glucose ratio (sometimes as high as 1:2). Bottom line, these food items can elicit an insulin response. As for increased fat synthesis, this has been evidenced in high intake of 50+ grams. This would mean 9 servings of fruit. Before you say that isn't so much, especially when combined with all the HFCS in our foods, fruit also contains almost as much fiber which, as Dr. Lustig claims, neutralizes the fructose. Now I'm not saying eat all the fructose you can, I'm merely proposing that fructose is dose-dependent. Within moderation, I would not overly stress it. Especially since fruit also contains vitamins, minerals, fiber, and phytochemicals important for muscle nourishment. *Note that these are the substances that soft drinks lack

No Carbohydrates With Fat
I feel like this mentality is related to the misguided idea that carbs are fattening. Again, excess calories are fattening and it is easy to forget about the butter on bread, mayonnaise in a sandwich, and oil in pasta that contribute a lot of fat calories to those carbs. In the bodybuilding world, this theory is likely more related to the idea that fat circulating in the bloodstream should not be available when insulin is raised because it will lead to creation of more adipocytes (fat cells). Insulin is an anabolic hormone but in reality, the type of fat (unsaturated or saturated) will make a significant difference in the insulin response of the carbs. For example, the insulin response to carbs ingested with unsaturated fats is likely to be unaffected whereas that of carbs ingested with saturated fats is raised. Nonetheless, these types of fat can lead to increased Triglyceride (TG) storage even if insulin isn't available. My take home point here is that fat storage is dependent upon multiple variables and not simply with insulin alone. This type of separation in meals could be difficult to follow and isn't shown to produce any weight-loss benefits. On the contrary, evidence has shown, eating a diet consisting of mixed substrate meals within your caloric recommendations is more beneficial.

Getting Started

Do you know your body's Calorie needs? Using the standard 2000 Calorie requirements on food labels is a great start however if you're looking for a more detailed and specific set of guidelines, I highly recommend spending just 30 minutes at fitday.com or mypyramidtracker.gov and providing a quick recall of yesterdays snacks, meals, and beverages. I personally use mypyramid however both are great resources and user-friendly. These sites will provide a detailed analysis of your submitted diet and compare it to suggested macro- and micro-nutrient and overall energy needs based on your gender, weight, height, and age (fitday also includes a physical activity option). Mypyramid calculates your Estimated Energy Requirement (EER) without incorporating physical activity (leisure and standard activity is included). At this site, it is calculated separately to estimate the cost in Calories of the training. Adding this with the EER should give you a relatively accurate idea of how many Calories you burn in a typical day.