What Makes a Good Recovery Drink, Part 1: Glycogen Repletion
You spend weeks, months, even years, preparing yourself for an endurance event. And during the event, you give everything you have trying to outperform your competition. Why, then, at the end of the event would you cut corners on the recovery phase?
Recovery from endurance exercise is every bit as important as what you do before and during the event. Immediately when you finish exercising, your body initiates a complex series of metabolic events in order to prepare itself for the next battle. And, just as with your preparation before the event, proper nutritional support plays a crucial role in this process.
There are many goals to consider with your post-event nutrition plan, such as repleting glycogen stores, optimizing muscle protein synthesis, and mitigating muscle damage. Today’s article will focus on the first of those concerns: ensuring that your body’s glycogen stores are being replenished in the most efficient way possible.
Your body breaks down glycogen throughout endurance performance, and this represents a significant source of fatigue in the immediate post-exercise period (1, 9). This is especially a concern for athletes competing in multi-day events, or those training or competing more than once in a 24 hour period. Enhancing glycogen recovery must be a fundamental part of any post-exercise nutritional strategy.
The timing of this replenishment is critical. Immediately post-exercise, your body’s glycogen synthesis machinery is ramped up to a high level, but the rate of this process immediately begins to drop dramatically. Studies have indicated that the rate of glycogen synthesis declines exponentially during the hours following exercise (16). Delaying the intake of carbohydrates more than two hours will lower the glycogen repletion rate by up to 45% (4). There is no time to spare when it comes to glycogen recovery.
The majority of substrate for glycogen re-synthesis comes from orally ingested carbohydrate (15). But there’s more to it than just taking carbs in general. The types and blends of carbs are also important. Research has shown that liver glycogen repletion can be enhanced more than two-fold when fructose is added to maltodextrin (2). This addition of fructose does not come at the expense of replenishing muscle glycogen stores (3), an often cited concern with mixing fructose and glucose. By combining maltodextrin and fructose, as found in Ultra 26™ Endurance and Recovery Drink, glycogen stores in both the liver and muscle can be optimally repleted.
In addition to replenishing your body’s glycogen stores, carbohydrates also play a critical role in your brain’s recovery from exercise. Research has shown that the brain has an increased need for carbohydrates following strenuous exercise (5). Getting motivated for your next bout of endurance performance requires a sharp mind also, not just a sharp body.
How about protein? Protein, when added to carbohydrates, can also contribute to glycogen re-synthesis. Like carbohydrates, protein is a potent stimulus for insulin secretion (10). Insulin, in turn, strongly stimulates glycogen synthesis (11). There is evidence, based on this, that adding protein to carbohydrates will enhance glycogen synthesis in the recovery period, due to its effects on insulin (8). Evidence has also shown that protein also can increase muscle synthesis in the recovery period following endurance exercise (12). Protein can benefit the endurance athlete in multiple ways following exercise or competition.
Caffeine has also shown to be a significant benefit in the recovery period. When added to carbohydrates immediately following exercise, caffeine has been shown to increase glycogen synthesis, and improve subsequent performance, beyond what carbs do alone (13, 17). If you want to optimize glycogen recovery, caffeine should absolutely be a part of your post-event nutritional plan.
Consider your recovery to be as essential a part of your regimen as what you do before and during exercise. Use Ultra 26™ products and ensure that your body has what it needs to recover and prepare for the next battle!
1. Cermak NM, van Loon LJ. The use of carbohydrates during exercise as an ergogenic aid. Sports Med. 2013 Nov;43(11):1139-55.
2. Décombaz J, Jentjens R, Ith M, Scheurer E, Buehler T, Jeukendrup A, Boesch C. Fructose and galactose enhance postexercise human liver glycogen synthesis. Med Sci Sports Exerc. 2011 Oct;43(10):1964-71.
3. Wallis G, Hulston C, Mann C, et al. Postexercise muscle glycogen synthesis with combined glucose and fructose ingestion. Med Sci Sports Exerc. 2008;40(10):1789–94.
4. Ivy JL, Katz AL, Cutler CL, Sherman WM, Coyle EF. “Muscle glycogen synthesis after exercise: effect of time of carbohydrate ingestion.” J. Appl. Physiol. 64(4):1480-1485, 1988
5. Nybo L, Nielsen B, Blomstrand E, Moller K, Secher N. Neurohumoral responses during prolonged exercise in humans. J Appl Physiol (1985). 2003 Sep;95(3):1125-31.
6. Burke LM, Hawley JA, Wong SH, Jeukendrup AE. “Carbohydrates for Training and Competition.” J Sports Sci. 2011;29 Supp 1: S17-27
7. Burke, L. M., Kiens, B., & Ivy, J. L. (2004). Carbohydrates and fat for training and recovery. Journal of Sports Sciences, 22, 15–30.
8. Zawadzki KM, Yaspelkis BB, Ivy JL. “Carbohydrate-protein complex increases the rate of muscle glycogen storage after exercise.” J. Appl. Physiol. 72(5): 1854-1859, 1992
9. Bergstrom, J., Hermansen L, Hultman E., AND Saltin B. Diet, muscle glycogen and physical performance. Acta Physiol Scand. 71:140-150,1967.
10. Nuttall FQ, Mooradian AD, Gannon MC, Billington C, Krezowski P. Effect of protein ingestion on the glucose and insulin response to a standardized oral glucose load. Diabetes Care. 1984 Sep-Oct;7(5):465-70.
11. Danforth WH. Glycogen synthetase activity in skeletal muscle. interconversion of two forms and control of glycogen synthesis. Biol Chem. 1965 Feb;240:588-93.
12. Howarth KR, Moreau NA, Phillips SM, Gibala MJ. Coingestion of protein with carbohydrate during recovery from endurance exercise stimulates skeletal muscle protein synthesis in humans. J Appl Physiol (1985). 2009 Apr;106(4):1394-402.
13. Pedersen DJ, Lessard SJ, Coffey VG, Churchley EG, Wootton AM, Ng T, Watt MJ, Hawley JA: High rate of muscle glycogen resynthesis after exhaustive exercise when carbohydrate is coingested with caffeine. J Appl Physiol 2008, 105:7-13.
14. Peternelj TT, Coombes JS. Antioxidant supplementation during exercise training: beneficial or detrimental? Sports Med. 2011 Dec 1;41(12):1043-69.
15. Jentjens R, Jeukendrup A. Determinants of post-exercise glycogen synthesis during short-term recovery. Sports Med. 2003;33(2):117-44.
16. Robergs RA. Nutrition and exercise determinants of postexercise glycogen synthesis. Int J Sport Nutr. 1991 Dec;1(4):307-37.
17. Taylor C, Higham D, Close GL, Morton JP. The effect of adding caffeine to postexercise carbohydrate feeding on subsequent high-intensity interval-running capacity compared with carbohydrate alone. Int J Sport Nutr Exerc Metab. 2011 Oct;21(5):410-6.